A 7-item Tampa Scale for Kinesiophobia in people with femoroacetabular impingement syndrome: evaluation of structural validity, hypothesis testing, internal consistency and minimally important change.

BACKGROUND: The 17-item Tampa Scale for Kinesiophobia (TSK) is a commonly used patient-reported outcome measure (PROM) to assess kinesiophobia, but the measurement properties of the TSK in people with femoroacetabular impingement syndrome (FAIS) are unknown. OBJECTIVES: 1) Revise the existing TSK by removing items, as needed, with inadequate functioning to optimise the TSK for people with FAIS, and 2) evaluate construct validity (both structural validity and hypothesis testing), internal consistency, and minimal important change. METHODS: Cross-sectional cohort study including 153 young adults with FAIS. Exploratory factor analysis (EFA) and confirmatory factor analysis (CFA) were used to evaluate structural validity and the TSK was revised to remove items with poor function, improving CFA model fit. Hypothesis testing, internal consistency (Cronbach's α) and minimal important change (distribution-based method) were also evaluated. RESULTS: A 7-item version of the TSK provided the best CFA model fit with 10-items functioning poorly and needing to be removed. The 7-item TSK was uni-dimensional (single factor in EFA) and had adequate structural validity (Standardised Root Measure Square = 0.0771). The 7-item TSK had insufficient hypothesis testing with moderate correlations to 8/14 PROMs measuring different constructs. The 7-item TSK had adequate internal consistency (α = 0.783). The minimal important change of the 7-item TSK was 6.00 points (0-100 point scale). CONCLUSION: We found that the '7-item TSK for FAIS', had superior structural validity to the original 17-item scale, suggesting that it may be more appropriate for use in this population. Further studies should evaluate other measurement properties of the 7-item scale.

Proposed Classification of Syndesmotic Soft Tissue Impingement and Its Association With Lateral Talar Cartilage Lesions.

BACKGROUND: Syndesmotic impingement syndrome has been described to explain persistent lateral or anterolateral ankle pain. This condition is thought to often result from a rotational ankle injury. This study aimed to identify the type of syndesmotic impingement tissue according to arthroscopic and histologic findings and to analyze its association with lateral talar cartilage lesions. METHODS: This retrospective study included 107 ankles in 105 patients who underwent arthroscopic surgery for syndesmotic impingement syndrome from January 2017 to August 2019. Histologic findings of biopsied impingement tissue were obtained in 59 ankles (55.1%) and compared with gross findings on arthroscopy. Cartilage lesions were evaluated using the International Cartilage Repair Society grading system. Risk factors associated with lateral talar cartilage injury were evaluated using multivariate logistic regression analysis. RESULTS: Based on the histologic results, the most common pathology was fibrosis (24 ankles [22.4%]), followed by fatty degeneration (23 ankles [21.5%]), synovial hyperplasia (8 ankles [7.5%]), and inflammatory synovium (4 ankles [3.7%]). Interclass correlation coefficient was 0.841 (P = .001) between histologic results and arthroscopic findings. Patients with fibrotic impingement tissue had on average a significantly longer duration of symptoms (12 vs 48 months, P = .021). A lateral talar dome cartilage lesion was detected in 25 ankles (23.4%). Fibrotic impingement tissue was the only factor significantly associated with lateral talar dome lesion on multivariate logistic regression analysis (odds ratio 10.04; 95% CI 1.84-54.9; P = .008). CONCLUSION: Syndesmotic impingement with fibrotic tissue was often associated with cartilage lesions at the lateral talar dome. Patients with prolonged anterolateral or lateral ankle pain after a rotational ankle injury warrant careful assessment for possible syndesmotic impingement by fibrotic tissue and associated lateral talar cartilage injury.

A retrospective cohort study: dual cannula combined with modified shoelace continuous capsular closure technique versus nonrepair in hip arthroscopic surgery of femoroacetabular impingement.

BACKGROUND: Over the years, with the improvement of diagnostic and therapeutic capabilities for hip joint diseases and the advancements in surgical technology, hip arthroscopy has been extensively used. At present, there is ongoing controversy among scholars about whether it is necessary to close the joint capsule after hip arthroscopy. In addition, the clinical effect of repairing the hip joint capsule after hip arthroscopy remains uncertain. PURPOSE: To evaluate the effect of our modified shoelace suture technique on postoperative hip function and to investigate whether complete closure of the hip capsule is reliable and safe. STUDY DESIGN: Retrospective study; Levels of evidence: III. METHODS: A retrospective review was conducted on patients undergoing hip arthroscopy by a solitary high-volume hip arthroscopic surgeon. The patients were categorized into two groups. The first group consisted of patients who underwent the modified shoelace continuous capsular closure technique. The other group consisted of those who did not receive capsular closure after hip arthroscopy. Patient-reported outcomes including modified Harris Hip Score (mHHS), Hip Outcome Score of Activities of Daily Living (HOS-ADL), Hip Outcome Score Sport-Specific Subscale (HOS-SSS), and visual analogue scale (VAS) were obtained at a minimum of 12 months. Any complications during follow-up were identified and recorded. RESULTS: A total of 100 patients were followed up for 12-15 months, with an average of (12.3 ± 5.3) months in the study. There were 50 patients in the shoelace capsular closure group (CC group) and 50 patients in the non-capsular closure group (NC group). The surgical time in the suture group was significantly longer than that in the non-suture group. However, there was no statistically significant disparity in the length of hospital stay between the two groups. The mHHS, HOS-SSS, HOS-ADL, and VAS of the CC and NC group were significantly improved compared to preoperative scores at 6 and 12 postoperative months (P < 0.001). Compared with the NC group, the CC group showed a significant improvement in the mHHS, HOS-SSS, HOS-ADL, and VAS at 6 postoperative months (t = 4.885, P<0.001; t = 5.984, P<0.001; t = 4.279, P<0.001; t = 3.875, P<0.001). The mHHS, HOS-SSS, HOS-ADL, and VAS at 12 postoperative months were significantly better in the CC group than in the NC group (t = 5.165, P<0.001; t = 3.697, P<0.001; t = 4.840, P<0.001; t = 3.579, P = 0.001). There were no serious complications during the perioperative period. CONCLUSION: The modified shoelace continuous capsular closure technique is a reliable and secure method that can be used as an alternative to the conventional capsular closure. It is recommended to perform routine intraoperative repair of the articular capsule at the end of hip arthroscopy, as this has a positive influences on the functional results at short-term follow-up.

Conventional single articulation constrained liners in revision hip arthroplasty: risk factors for failure and their combinations.

BACKGROUND: Constrained liners (CLs) have been used in revision total hip arthroplasty (rTHA) with varying results. Relatively few studies have identified specific risk factors for failure. This study aimed to assess implant survivorship and complication rates, identify risk factors for constraint-related complications, and assess the effect of multiple factors present in a single case. METHODS: We conducted a retrospective analysis of 101 rTHAs for various aseptic indications and as second-stage procedures for periprosthetic joint infection (PJI) utilising 2 models of conventional single-articulation CLs. We excluded 8 cases in which the liners were removed early due to PJI and assessed the risk factors for constraint-related complications in the remaining 93 cases. The mean follow-up duration for complication-free cases was 6.5 years (range 4.7-10.5 years). RESULTS: The incidences of dislocation of a prosthetic head and loosening of the acetabular component were 19.8% and 5.0%, respectively. We also observed 8 cases where the locking ring of the liner was dislodged without dislocation (1 case required re-revision). The presence of factors related to impingement (cup retention, smaller internal diameter CLs, signs of probable impingement from the femoral side) was associated with higher rates of constraint-related complications. The presence of factors related to soft-tissue stabilisers did not increase the rate of complications. The simultaneous presence of multiple impingement-related risk factors resulted in worse outcomes. CONCLUSIONS: CLs may be less effective for treating or preventing instability related to impingement. CLs should be used with caution or avoided when multiple impingement-related risk factors are present.

Clinical Effects of Additional Platelet-Rich Plasma Application to Exercise Therapy in Patients with Subacromial Impingement Syndrome: A Double-Blind Randomized Controlled Trial.

Background: Exercise therapy (ET) is the main and initial treatment modality for treating subacromial impingement syndrome (SIS). The isolated or combined use of platelet-rich plasma (PRP) applications in treating SIS is increasing and promising. A comparison was made on the effectiveness of ET alone and in combination with PRP on pain, functionality, and quality of life (QoL) in patients with SIS. Purposes/Hypothesis: The purposes of this study were to (1) investigate the possible positive effects of PRP injections combined with ET in treating SIS on pain, functionality, and QoL and (2) propose an alternative treatment protocol. It was hypothesized that the group receiving PRP applications in addition to ET would have a better QoL due to less pain and higher functionality 6 months after treatment. Study Design: Randomized controlled trial; Level of evidence, 2. Methods: Volunteer patients diagnosed with SIS were included based on history and physical examination findings. All participants underwent magnetic resonance imaging to confirm the diagnosis and exclude possible accompanying pathologies. The patients were randomly divided into 2 groups. The first group underwent ET at home for 8 weeks (ET group), and the second group received the same ET program and an additional 2 PRP injections, at the beginning of the study and the end of the fourth week (PRP group). Patients were evaluated initially and 6 months after the treatment using the visual analog scale (VAS) for pain score, Constant-Murley Score (CMS), and the 36-Item Short Form Health Survey (SF-36). The Kolmogorov-Smirnov test determined the conformity of the data to a normal distribution, chi-square analysis was used to compare categorical variables between groups, and the Mann-Whitney U test was used to compare continuous and intergroup variables. Intragroup changes before and after treatment were evaluated with the Wilcoxon signed-rank test. P < .05 was considered statistically significant. Results: A total of 67 patients were initially enrolled; 5 were excluded and 6 were lost to follow-up (1 because of a COVID diagnosis). Thus, 56 patients (56 shoulders) were included for analysis. There were 28 patients in the ET group and 28 patients in the PRP group. There were no statistical differences between groups regarding participant characteristics and clinical evaluations before treatment. A statistically significant improvement was observed in pain (VAS subgroups), functionality (CMS subgroups), and QoL (SF-36 subgroups) evaluations of patients in both the ET and the PRP groups compared with before the treatment and 6 months after treatment (P < .05). At the 6-month posttreatment evaluation, the PRP group was statistically significantly superior to isolated ET in terms of VAS rest (P = .001) and night (P = .004) scores. This superiority was also in favor of the PRP group in flexion strength (P = .001), abduction strength (P = .046), and abduction degree (P = .041) measurements. There was no significant difference between ET and PRP groups regarding VAS activity, CMS, and SF-36 scores (P > .05) at 6 months. Conclusion: Our study showed that both isolated ET and additional PRP application to ET are effective methods in SIS treatment regarding pain, function, and QoL. Combining ET with PRP was superior in reducing pain and improving abduction degree and strength.

Association between Shoulder Dysfunction and Concomitant Neck Disability in Patients with Shoulder Disorders.

Objectives: This study aimed to investigate the impact of shoulder dysfunction on concomitant neck disability in patients with shoulder disorders. Methods: The participants were patients with subacromial impingement syndrome (SIS) and frozen shoulder (FS). Twenty patients with SIS and 21 with FS without cervical radiculopathy were enrolled. The participants were assessed for the 4-week prevalence of neck pain, Neck Disability Index (NDI), shoulder strength and range of motion, a short version of the Disabilities of the Arm, Shoulder, and Hand questionnaire (quick-DASH), and the Pain Catastrophizing Scale (PCS). Results: The 4-week prevalence of neck pain was 12 out of 20 (60%) in patients with SIS and 13 out of 21 (62%) in patients with FS. The median NDIs were 13 and 12 for SIS and FS, respectively, with no statistically significant difference. About 41% (17/41) of the participants displayed an NDI greater than the cutoff value for disability in daily living. Although shoulder abduction strength correlated with the NDI in patients with SIS, the PCS score correlated with the NDI in patients with FS. Conclusions: Concomitant neck disability is a critical concern for patients with shoulder disorders. The clinical factors related to concomitant neck disability differ between SIS and FS, with specific interventions recommended for each condition.

CT-guided infiltration of the ischiofemoral space in young patients with ischiofemoral impingement is an effective diagnostic tool.

OBJECTIVES: To present our technique of diagnostic CT-guided ischiofemoral space injection and report on pain response, complications, and associated imaging findings in young patients with ischiofemoral impingement (IFI). METHODS: Retrospective case series of patients with a clinical diagnosis of IFI that underwent CT-guided IFS injection with local anesthetic in a prone position with the feet in maximum internal rotation between 06/2019 and 04/2021. The response was evaluated using maximum subjective pain evaluation on a 0-10 visual analog scale (VAS) during a standardized pre- and postinterventional clinical examination. Patient charts and radiographic imaging data were reviewed to report associated imaging findings and subsequent surgeries. RESULTS: Eleven patients (13 hips, 9 females) with a median age of 31 years (interquartile range; IQR: 25-37 years) were included. Median baseline VAS was 7 points (IQR: 5-8) with a pain reduction of 5 points (IQR: 5-7 points, p = 0.001) after the injection. One patient reported transient ischial nerve paresthesia, otherwise, no complications occurred. Quadratus femoris muscle edema was present in 85% (11 of 13 hips). Excessively high femoral torsion (11/13 hips, 85%) and cam deformities (8/13 hips, 62%) were the most common osseous deformities. Eight of 13 hips (62%) underwent subsequent surgery for IFI. CONCLUSION: CT-guided diagnostic injection of the ischiofemoral space is safe and feasible. In young IFI patients, diagnostic IFS injections have the potential to improve the differential diagnosis of hip pain and to inform decision-making with regard to a possible benefit of joint-preserving hip surgery. CRITICAL RELEVANCE STATEMENT: In young patients with hip pain, diagnosis of IFI can be challenging due to concomitant pathologies. Furthermore, surgical treatment in these patients is controversial. In this context, CT-guided diagnostic infiltrations of the ischiofemoral space may facilitate not only the initial diagnosis of IFI, but could also improve surgical decision-making. KEY POINTS: CT-guided diagnostic injection of local anesthetic in the ischiofemoral space is safe. In young patients with IFI, it leads to subjective pain reduction. In young patients with concomitant osseous deformities, it may improve surgical decision-making.

Association Between Hip Translation and Hip Rotation and Anatomy: A Pilot Quasi-static MRI Study.

Background: There is little known about translation of the hip and the relationship with hip rotation and morphology in asymptomatic patients. Hypotheses: (1) Femoral head would exhibit significant translations in asymptomatic hips, (2) femoral head translations would correlate to femoral rotations, and (3) range of femoral head translations would correlate to hip morphology. Study Design: Cross-sectional study; Level of evidence, 3. Methods: A total of 11 individuals (age, 23-47 years; 64% female) with asymptomatic hips underwent hip magnetic resonance imaging (MRI) in the following postures: neutral (supine), midflexion, maximum-flexion, internal rotation, internal rotation + midflexion, internal rotation + maximum-flexion, adduction, flexion-abduction-external rotation (FABER), extension, and lateral abduction. All rotations were passive. MRI-generated 3-dimensional hip models were used to quantify femoral rotations and translations. Femoral head diameter, acetabular diameter, lateral center-edge angle, alpha angle, femoral anteversion, acetabular version and inclination, and neck-shaft angle were measured from MRI. A t test was used if measured translations were statistically significant. Linear regression was used to assess the associations between translation and rotation. Pearson correlation was used to assess the relationships between hip anatomy and range of femoral head translations. Results: In all tested positions, the femoral head translated anteriorly by 2 ± 1 mm (maximum 5 mm, P < .001), posteriorly by 1 ± 1 mm (maximum 6 mm, P < .001), superiorly by 2 ± 2 mm (maximum 7 mm, P < .001), inferiorly by 2 ± 2 mm (maximum 6 mm, P < .001), laterally by 1 ± 1 mm (maximum 4 mm, P < .001), and medially by 2 ± 1 mm (maximum 5 mm, P < .001), relative to the rested supine position. Femoral flexion was associated with posterior translation of the femoral head (P = .038). Femoral abduction was associated with medial translation of the femoral head (P = .042). Higher femoral anteversion and smaller alpha angle were associated with a higher total magnitude of femoral head translation in the anterior-posterior direction (P < .04). Smaller femoral anteversion, higher acetabular inclination, smaller lateral center-edge angle, and lower neck-shaft angle were associated with a higher total magnitude of femoral head translation in the superior-inferior direction (P ≤ .03). Conclusion: Our study demonstrated that, during passive physiologic movement, asymptomatic hips on average translated up to 2 mm (with up to 7 mm maximum translation in some positions), which is potentially related to hip rotations and morphology. Further investigations are warranted to understand the normal and pathologic hip translations and their impact on hip function (ie, instability and impingement).

Development of a novel rabbit model for femoroacetabular impingement through surgically induced acetabular overcoverage.

There is a lack of validated small animal models for femoroacetabular impingement (FAI) that induce intra-articular lesions and cause osteoarthritis (OA) progression. The gene expression profile of articular cartilage in patients with FAI has not been characterized in animal studies. The purpose of this study is to describe a novel rabbit model for FAI with validated induction of intra-articular lesions and OA progression and to characterize the gene expression pattern in impinged cartilage using this model. Thirty 6-month-old New Zealand White rabbits underwent unilateral endobutton implant placement at the acetabular rim to surgically create overcoverage. Radiological assessment confirmed secure placement of endobutton at the acetabular rim for all operated hips with a mean alteration in lateral center-edge angle (ΔLCEA) of 16.2 ± 6.6°. Gross inspection revealed secondary cartilage injuries in the anterosuperior region of the femoral head for the operated hips. Cartilage injuries were shown to exacerbate with increased impingement duration, as demonstrated by the modified Outerbridge scores and Mankin scores. Immunostaining and quantitative real-time polymerase chain reaction revealed elevated expression of inflammatory, anabolic and catabolic genes in impinged cartilage. RNA sequencing analysis of cartilage tissue revealed a distinct transcriptome profile and identified C-KIT, CD86, and CD68 as central markers. Our study confirmed that the novel rabbit FAI model created acetabular overcoverage and produced articular cartilage injury at the impingement zone. Cartilage from the impingement zone demonstrated a heightened metabolic state, corroborating with the gene expression pattern observed in patients with FAI.

Non-osseous coalition of accessory anterolateral talar facet-A case series.

The accessory anterolateral talar facet (AALTF) is an anatomical variation that broadens the apex of the lateral talar process. Studies have associated it with other tarsal coalitions as a cause of rigid painful flatfoot. However, a coalition of an AALTF has never been described before. With the advent of MRI, there has been an increase in the detection of these accessory facets. Nevertheless, owing to its small size and unfamiliarity, it is not easily identified. Proper assessment of imaging findings and associated conditions is needed to confirm the diagnosis. Imaging findings in a series of four patients with painful rigid flatfoot revealed the presence of an AALTF with adjacent marrow edema and reduced joint space. This was associated with hindfoot valgus and subfibular impingement. Radiographic suspicion of a non-osseous coalition of AALTF was raised, which was confirmed intraoperatively in one of the patients and demonstrated on CT and MR images in the other patients. This case series presents rare cases of non-osseous coalition of AALTF with a new radiographic sign, the 'reverse tip of the iceberg sign'.

Prevalence of Abnormal Findings in the Posterosuperior Humeral Head of Asymptomatic Collegiate Baseball Pitchers Using Ultrasonography.

BACKGROUND: The posterosuperior humeral head contacts the glenoid during pitching. While magnetic resonance imaging (MRI) often detects abnormalities in the posterosuperior humeral head of baseball pitchers, ultrasonography may also be effective in identifying these abnormalities. However, studies on such abnormalities in asymptomatic players are limited. Thus, this study aimed to determine the prevalence of abnormal findings in the humeral head using ultrasonography in asymptomatic collegiate baseball pitchers. METHODS: We utilized ultrasonography to assess abnormal findings in the humeral head, defined as a break in continuity or an irregular surface around the infraspinatus insertion, in 33 college baseball pitchers (pitcher group) and 30 college students without experience in overhead sports (control group). For 11 of the 33 pitchers, computed tomography (CT)-like images were used to locate the abnormalities. The location was quantitatively identified in the axial plane using a clock system, with the bicipital groove designated as 12 o'clock, and qualitatively assessed in the sagittal plane. Shoulder internal and external rotation ranges of motion (IR and ER ROMs) and humeral retroversion were measured using an inclinometer. The prevalence of abnormalities among the four subgroups (throwing and non-throwing shoulders of the pitcher group and dominant and non-dominant shoulders of the control group) was compared using the Fisher's exact test. A paired t-test was also performed to compare the IR and ER ROMs, as well as the humeral retroversion between each group's throwing (dominant) and non-throwing (non-dominant) sides. RESULTS: The prevalence of abnormalities was significantly higher (76%) in the throwing shoulder of the pitcher group than in the other shoulder groups (< .001). The mean position of the humeral head abnormalities in the axial plane was 8:32 ± 0:21 in the clock system, with all abnormalities located at the infraspinatus insertion on the greater tuberosity in the sagittal plane according to CT-like image analysis. While ER ROM and humeral retroversion were greater in the throwing shoulder, IR ROM was less than that in the non-throwing shoulder in the pitcher group (< .001). CONCLUSION: Ultrasonographic assessments revealed a higher prevalence of abnormalities in humeral head for asymptomatic collegiate baseball pitchers. Repetitive throwing motions may lead not only to adaptations in the ROM of the shoulder joint but also to abnormalities in the humeral head. Thus, ultrasonography may help identify asymptomatic baseball players with physiological internal impingement.

The association between cam morphology and hip pain in males and females within 10 years: A national prospective cohort study (CHECK).

OBJECTIVES: To determine the association between baseline cam morphology and self-reported hip pain assessed at annual visits over a 10-year follow-up period stratified by biological sex. The secondary aim was to study the association between the magnitude of cam morphology and the severity of pain in symptomatic hips. METHODS: The nationwide prospective Cohort Hip and Cohort Knee (CHECK) study includes 1,002 participants aged 45-65 years. Logistic regression with generalized estimating equations were used to determine the strength of the associations between (1) baseline cam morphology (both alpha angle ≥60° and as a continuous measure) and the presence of hip pain at 10 annual follow-up visits and (2) the alpha angle (continuous) and the severity of pain as classified by Numerical Rating Scale at 5-,8-, 9-, and 10-years. The results are expressed as odds ratios (OR), adjusted for age, biological sex (only in the sex-combined group), body mass index, and follow-up Kellgren and Lawrence grade. RESULTS: In total, 1,658 hips were included at baseline (1,335 female hips (79.2%)). The prevalence of cam morphology was 11.1% among all hips (29.1% in males; 6.4% in females). No association was found between cam morphology at baseline and the presence of hip pain at any follow-up in the female or sex-combined group. In males, only at 5-year follow-up, significant adjusted ORs were observed for the presence of cam morphology (1.77 (95%CI: 1.01-3.09)) and the alpha angle (1.02 (95%CI:1.00-1.04)). No evidence of associations was found between the alpha angle and the severity of hip pain in any of three groups. CONCLUSION: Within this study, no consistent associations were found between cam morphology and hip pain at multiple follow-ups. There might be a weak relationship between cam morphology and hip pain in males, while no such relation was found in females. We did not identify an association between the alpha angle and severity of hip pain.

Younger age correlates with increased gutter impingement rates after total ankle arthroplasty.

BACKGROUND: While total ankle arthroplasty (TAA) has evolved over the years with improved designs and enhanced bony fixation methods, it remains a technically demanding procedure with a risk of early postoperative complications. One of the most common complications associated with TAA is medial and lateral gutter ankle impingement, which can lead to issues such as increased pain and decreased range of motion (ROM). However, there is a paucity of information in the literature discussing the impact of certain risk factors on gutter impingement complications. METHODS: A retrospective analysis was conducted on a cohort of patients who underwent a TAA at a single institution from 2003 to 2019 with a minimum of 2-year follow-up. Patient were identified as having gutter impingement based on diagnostic imaging and/or clinical examination. Data collection included demographics, implant type, follow-up time, and co-morbidities. Multivariate odds ratios (OR) of experiencing gutter impingement were calculated for perioperative variables. RESULTS: The study included a total of 908 patients who underwent TAA with a minimum of 2 year follow up and 121 patients (13.3 %) who subsequently experienced gutter impingement. The average follow-up time was 5.84 + /- 3.07 years. There were 178 patients under 55 years old, 495 patients aged 55 to 70, and 235 patients over 70 years old. A higher rate of gutter impingement was observed in patients under 55 years of age compared to those aged 55 to 70 and over 70 (20.8 % vs. 13.5 % vs. 7.2 %; p < 0.01). Multivariable logistic regression revealed that patient age was significantly correlated with gutter impingement following TAA, with an OR of 0.94 (CI: 0.91-0.98; p < 0.01). CONCLUSION: This study demonstrated increased incidence of gutter impingement in younger patients who underwent TAA. Propensity for scar tissue formation may be higher in this population. Scar tissue deposition following TAA can cause narrowing of the medial and lateral clear spaces, potentially leading to gutter impingement. Additionally, younger patients may have increased activity demands, which subsequently may cause higher rates of symptomatic impingement. As increased impingement after TAA may require the need for additional debridement surgeries, it is important to understand the intricate relationship between age and gutter impingement for managing patient expectations following TAA. LEVEL OF EVIDENCE: Level III.

Greater distance from the glenosphere center to the acromion reduces risk of acromial impingement in semi-inlay reverse shoulder arthroplasty.

Background: Recently, the issue of subacromial notching, caused by acromial impingement has been reported. The purpose of this study was to assess the impact of differences in the distance between the glenosphere center and the greater tuberosity (DGT) and the distance between the glenosphere center and the acromion (DA) on the closest distance between the greater tuberosity and the acromion during active abduction in shoulders with reverse total shoulder arthroplasty (RSA). Methods: Eleven shoulders with semiinlay RSA were analyzed. Subjects underwent fluoroscopy during active scapular plane abduction. Computed tomography of their shoulders was performed to create three-dimensional (3D) implant models at a mean of 16 months after surgery. Using model-image registration techniques, poses of 3D implant models were iteratively adjusted to match their silhouettes with the silhouettes in the fluoroscopic images (shape matching), and 3D kinematics of implants were computed. The closest distance between the acromion and greater tuberosity was computed at maximum abduction. DA and DGT were measured from 3D surface models. Shoulders were divided into two groups based on DA and DGT measurements and their closest distance data were compared between the groups. Results: There were 7 shoulders with DA ≥ DGT, and 4 shoulders with DA < DGT. Shoulders with DA ≥ DGT showed a significantly wider distance between the greater tuberosity and acromion at maximum abduction compared to those with DA < DGT (5.9 ± 2.4 mm vs. 0.6 ± 0.7 mm, respectively, P = .0021). There were no significant differences in maximum glenohumeral abduction angle and humeral abduction angle between the two groups. Although DA was significantly greater in shoulders with DA ≥ DGT than in those with DA < DGT (43.7 ± 4.4 mm vs. 35.1 ± 6.7 mm, respectively, P = .0275), there was no significant difference in DGT between the two groups. Conclusion: When DGT is less than DA in shoulders with RSA, the closest distance between the greater tuberosity and the acromion at maximum abduction is significantly wider compared to cases where DGT is greater than DA by 3D measurement. Therefore, acromial impingement is less likely to occur in shoulders with RSA when DA is greater than DGT. To avoid acromial impingement, it might be important to make DA greater than DGT.

Optimizing stability and motion in reverse shoulder arthroplasty with a 135° neck-shaft-angle: a computer model study of standard versus retentive humeral inserts.

Background: There has been a trend to shift from a 155° and 145° neck-shaft-angle (NSA) to a more "anatomical" reverse shoulder arthroplasty with less distalization and a 135° NSA. Multiple studies have shown that a 135° NSA is beneficial for motion. There are some concerns about primary implant stability with a 135° NSA. When instability is detected, increasing the tension with thicker inlays or changing the NSA to 145° are possible solutions. A retentive 135° (Ret135) inlay may be an alternative to avoiding increased distalization; however, retentive liners are widely regarded as salvage options reducing range of motion (ROM) and avoided by most surgeons. The hypothesis of this study was that a retentive 135° insert of the tested implant system may not have drawbacks for impingement-free ROM compared to a standard 145° insert (Sta145). Methods: In this computer model study, 22 computed tomographic scans (11 males/11 females) were used to create models with a constant humeral stem (Perform/Stryker) and +3 mm lateralized baseplate +36 mm glenosphere for females and +6 mm lateralized baseplate +39 mm glenosphere for males using Blueprint software (Imascap, Brest, France). A Ret135, standard 135° (Sta135), and Sta145 (+10°) insert were compared for adduction (ADD), extension (EXT), external rotation (ER), and internal rotation (IR) all with the arm at the side as well as for combined IR (CIR = EXT + IR) and combined notching relevant (CNR) ROM (EXT + ER + IR + ADD). Results: Sta135 showed significantly better ROM for ER, IR, ADD, EXT, CNR ROM, and CIR compared to Ret135 (P < .05) and significantly better EXT and ADD compared to Sta145 (P < .0001). Comparison of Ret135 and Sta145 showed equivalent ROM performance, which was slightly better but nonsignificant for ADD (P = .16), EXT (P = .31), CNR ROM (P = .7), and CIR (P = .54) in favor of Ret135. Isolated IR (P = .39) and ER (P = .32) were slightly better but nonsignificant in favor of a Sta145. Conclusion: For this implant system tested in a computer model, a 135° standard liner offers the best ROM. A 135° retentive liner maintains at least equivalent CIR and motion to prevent notching compared to a standard 145° liner. 135° retentive liners are more than salvage options and may help to prevent distalization and overtensioning by increased liner thickness.

Understanding pelvic mobility is important to correctly diagnose and treat painful hips with positive impingement test in non-arthritic patients.

INTRODUCTION: To determine repeatability of pelvic mobility, calculated as both change in sacral slope (∆SS) and pelvic tilt (∆PT), and evaluate their correlations with pelvic incidence (PI) in non-arthritic patients with hip pain and positive impingement test. METHODS: The cohort comprised 82 patients aged 31.8 ± 7.4, with hip pain and positive impingement test. Stereo-radiographic images were acquired in three positions (neutral standing, neutral sitting, and flexed-forward-sitting). PI, pelvic tilt (PT), and sacral slope (SS) were measured. Repeatability was evaluated. Pelvic mobility was calculated as ΔPT and ΔSS from (i) standing to sitting, (ii) neutral to flexed-forward-sitting, and (iii) maximum to minimum values. Correlations of PI with PT, SS, ΔPT, and ΔSS were assessed. RESULTS: Repeatability was excellent for all pelvic mobility measurements (intraclass correlation coefficients, ICC > 0.97). ΔPT was 25.9 ± 8.3º from standing to sitting, 14.4 ± 11.2º from standing to flexed-forward-sitting, and 37.8 ± 13.7º from maximum to minimum values. ΔSS was 24.0 ± 7.6º from standing to sitting, 14.2 ± 11.6º from standing to flexed-forward-sitting, and 35.9 ± 13.7º from maximum to minimum values. PI was strongly correlated with PT in standing (r = 0.7) and SS in standing (r = 0.7), and moderately correlated with PT in sitting (r = 0.6) and SS in sitting (r = 0.5), but was not correlated with neither ΔPT nor ΔSS (r < 0.3). CONCLUSION: Pelvic mobility, calculated as ΔPT and ΔSS, has excellent repeatability, and is not correlated with PI in non-arthritic patients with hip pain. Therefore, PI is of limited value for diagnosis and treatment of painful hips with positive impingement test, as well as to distinguish hip users from spine users; pelvic mobility should be used instead. LEVEL OF EVIDENCE: Level IV.

Return to Sport Following Arthroscopic Management of Femoroacetabular Impingement: A Systematic Review.

Background: Femoroacetabular impingement (FAI) is common. The present systematic review updates the current evidence on return to sport (RTS) in patients who have undergone arthroscopic surgery for FAI in any of its variants (CAM, pincer, or both). Methods: The outcomes of interest were sports-related patient-reported outcome measures (PROMs) and the level and time to RTS. All available clinical studies concerning the RTS following arthroscopic management of FAI were considered. In July 2024, the following databases were accessed following the PRISMA guidelines: Embase, Web of Science, and PubMed. Only studies with a minimum of six months of follow-up were eligible. Results: From 1245 initially identified articles, 43 studies (4103 patients) met the inclusion criteria, in which 32.1% (1317 of 4103 patients) were women. The mean length of follow-up was 33.7 ± 15.8 months. The mean age was 28.1 ± 7.2 years, the mean BMI was 24.7 ± 6.4 kg/m2, and 79.6% ± 27.8% of patients returned to sport at the same or higher level at a mean of 14.3 ± 9.6 months. The mean time away from sports was 8.0 ± 3.3 months. Conclusion: Arthroscopic management for FAI leads to a high rate of RTS, with approximately 80% of patients returning to their preinjury level. Future research should focus on standardised definitions of RTS, sport-specific rehabilitation protocols, and the influence of deformity and procedures on RTS.

Relationship Between Neighborhood-Level Socioeconomic Status and Functional Outcomes After Hip Arthroscopy.

BACKGROUND: Despite the growing volume of neighborhood-level health disparity research, there remains a paucity of prospective studies investigating the relationship between Area Deprivation Index (ADI) and functional outcomes for patients undergoing hip arthroscopy. PURPOSE: To investigate the relationship between neighborhood-level socioeconomic status and functional outcomes after hip arthroscopy. STUDY DESIGN: Cohort study; Level of evidence, 3. METHODS: A retrospective analysis of prospectively collected data was performed on patients aged ≥18 years with minimum 1-year follow-up who underwent hip arthroscopy for the treatment of symptomatic labral tears. The study population was divided into ADILow and ADIHigh cohorts according to ADI score: a validated measurement of neighborhood-level socioeconomic status standardized to yield a score between 1 and 100. Patient-reported outcome measures (PROMs) included the modified Harris Hip Score, Nonarthritic Hip Score, Hip Outcome Score-Activities of Daily Living, Hip Outcome Score-Sports-Specific Subscale, 33-item International Hip Outcome Tool, visual analog scale for pain, and patient satisfaction. RESULTS: A total of 228 patients met inclusion criteria and were included in the final analysis. After patients were stratified by ADI score (mean ± SD), the ADILow cohort (n = 113; 5.8 ± 3.0; range, 1-12) and ADIHigh cohort (n = 115; 28.0 ± 14.5; range, 13-97) had no differences in baseline patient demographics. The ADIHigh cohort had significantly worse preoperative baseline scores for all 5 PROMs; however, these differences were not present by 1-year follow-up. Furthermore, the 2 cohorts achieved similar rates of the minimal clinically important difference for all 5 PROMs and the Patient Acceptable Symptom State for 4 PROMs. When controlling for patient demographics, patients with higher ADI scores had greater odds of achieving the minimal clinically important difference for all PROMs except the 33-item International Hip Outcome Tool. CONCLUSION: Although hip arthroscopy patients experiencing a greater neighborhood-level socioeconomic disadvantage exhibited significantly lower preoperative baseline PROM scores, this disparity resolved at 1-year follow-up. In fact, when adjusting for patient characteristics including ADI score, more disadvantaged patients achieved greater odds of achieving the minimal clinically important difference. The present study is merely a first step toward understanding health inequities among patients seeking orthopaedic care. Further development of clinical guidelines and health policy research is necessary to advance care for patients from disadvantaged communities.

Significant systematic bias of alpha angles measured on MRI compared to various radiographic views in patients with femoroacetabular impingement syndrome.

PURPOSE: The aim of this study was to assess the inter-rater reproducibility and inter-method comparability of hip alpha angle measurements on magnetic resonance imaging (MRI)/magnetic resonance arthrography (MRA) and plain radiographs in patients with femoroacetabular impingement syndrome (FAIS). METHODS: A cross-sectional study of patients who were diagnosed with symptomatic FAIS underwent preoperative MRI/MRA with axial oblique and/or radial plane imaging and had preoperative radiographs with anterior-posterior (AP), 45° Dunn and 90° Dunn views. Alpha angle measurements were performed independently by two musculoskeletal radiologists. Inter-rater reproducibility and inter-method comparability between MRI/MRA images and radiographic views were assessed using the intraclass correlation coefficient (ICC) with 95% confidence interval (CI). RESULTS: Ninety-seven patients were included of whom 93 (95.8%) received axial oblique plane images and 54 (55.6%) had radial plane MRI/MRA images. Inter-rater reproducibility was excellent (ICC > 0.9) for all planes on MRI/MRA and radiographs. MRI/MRA axial oblique images had poor (ICC 0.39, 95% CI [0.09, 0.59]), moderate (ICC 0.57, 95% CI [0.18, 0.75]) and moderate (ICC 0.64, 95% CI [0.20, 0.81]) comparability with AP, 45° Dunn and 90° Dunn, respectively. MRI/MRA radial plane images had equivocal (0 included in all CIs) comparability with AP (ICC 0.66), 45° Dunn (ICC 0.35) and 90° Dunn (ICC 0.14) radiographs. On average, alpha angle measurements were significantly higher with radial images and lower with axial oblique images, when compared to all radiographic views (p < 0.05), except axial oblique versus 45° Dunn views, where angles measured on axial oblique were significantly larger. CONCLUSION: Alpha angle measurements taken on axial oblique MRI/MRA images show moderate comparability to radiographic 45° Dunn and 90° Dunn views despite negative bias to measurements taken on radiographic AP and 45° Dunn view. Larger alpha angles were appreciated on MRI/MRA radial and axial oblique views compared to radiographic views supporting the inclusion of MRI/MRA alpha angle measurements to properly identify deformity. LEVEL OF EVIDENCE: Level II.

Patients Undergoing Revision Hip Arthroscopy With Labral Reconstruction or Labral Repair and Patient-Reported Outcomes: A Systematic Review.

Background: Compromise of the acetabular labrum can lead to pain and loss of critical intra-articular fluid pressure. Revision labral preservation poses unique challenges due to adhesions and compromised tissue quality. Purpose/Hypothesis: The purpose of the study was to evaluate patient-reported outcome (PRO) measures (PROMs) in patients undergoing revision hip arthroscopy with either labral reconstruction or labral repair after primary hip arthroscopy for labral tear. It was hypothesized that both procedures would lead to improved PROs. Study Design: Systematic review; Level of evidence, 4. Methods: A systematic review of the literature was conducted with the following keywords: (revision) AND (hip OR femoroacetabular impingement) AND (arthroscop*) AND (reconstruction OR repair) in PubMed, Cochrane, and Scopus in August 2023 using the PRISMA (Preferred Reporting Items for Systematic Reviews and Meta-Analyses) criteria, yielding 2002 initial records. Only studies comparing PROMs between revision labral reconstruction or revision labral repair after primary hip arthroscopy for labral tear were included. Background article information was recorded, including article title, author, study design, level of evidence, patient demographics, radiographic information, intraoperative data, PROMs, psychometric thresholds, and secondary surgeries. Secondary surgery in our study was defined as any open or arthroscopic hip surgery secondary to the initial revision surgery. Forest plots were created for pre- and postoperative outcomes present in ≥3 studies. Heterogeneity was calculated using I 2 values. Results: Four studies, including 215 revision labral reconstructions and 115 revision labral repairs of the hips, were included in this systematic review. All studies were level 3 evidence, and study periods ranged between 2009 and 2019. Mean follow-up for the reconstruction and repair groups ranged from 26.3 to 36.6 months and 30.7 to 56.4 months, respectively. The mean age for the reconstruction and repair groups varied between 27 to 34.6 years and 27.5 to 30 years, respectively. Mean postoperative modified Harris Hip Scores for the reconstruction and repair cohorts ranged from 72.0 to 81.2 and 70.8 to 84.1, respectively (I 2 = 0%). Mean visual analog scale for pain scores for the reconstruction and repair cohorts ranged from 3 to 3.5 and 2.3 to 3.9 (I 2 = 33%). Overall secondary surgery rates ranged from 10.0% to 26.7% in the labral reconstruction cohort, compared with 10.0% to 50.0% in the labral repair cohort. One study reported superior outcomes in the revision labral repair group, with 3 studies finding no statistically significant difference in outcomes between the groups. Conclusion: Our systematic review showed that patients undergoing revision hip arthroscopy with labral reconstruction demonstrated significant improvement in postoperative outcome measures. Postoperative outcomes were similar to those of a benchmark control group of patients undergoing revision hip arthroscopy and labral repair. Labral reconstruction in the revision setting appears to be an effective treatment in clinically indicated patients.