Limited clinical utility of a machine learning revision prediction model based on a national hip arthroscopy registry.

PURPOSE: Accurate prediction of outcome following hip arthroscopy is challenging and machine learning has the potential to improve our predictive capability. The purpose of this study was to determine if machine learning analysis of the Danish Hip Arthroscopy Registry (DHAR) can develop a clinically meaningful calculator for predicting the probability of a patient undergoing subsequent revision surgery following primary hip arthroscopy. METHODS: Machine learning analysis was performed on the DHAR. The primary outcome for the models was probability of revision hip arthroscopy within 1, 2, and/or 5 years after primary hip arthroscopy. Data were split randomly into training (75%) and test (25%) sets. Four models intended for these types of data were tested: Cox elastic net, random survival forest, gradient boosted regression (GBM), and super learner. These four models represent a range of approaches to statistical details like variable selection and model complexity. Model performance was assessed by calculating calibration and area under the curve (AUC). Analysis was performed using only variables available in the pre-operative clinical setting and then repeated to compare model performance using all variables available in the registry. RESULTS: In total, 5581 patients were included for analysis. Average follow-up time or time-to-revision was 4.25 years (± 2.51) years and overall revision rate was 11%. All four models were generally well calibrated and demonstrated concordance in the moderate range when restricted to only pre-operative variables (0.62-0.67), and when considering all variables available in the registry (0.63-0.66). The 95% confidence intervals for model concordance were wide for both analyses, ranging from a low of 0.53 to a high of 0.75, indicating uncertainty about the true accuracy of the models. CONCLUSION: The association between pre-surgical factors and outcome following hip arthroscopy is complex. Machine learning analysis of the DHAR produced a model capable of predicting revision surgery risk following primary hip arthroscopy that demonstrated moderate accuracy but likely limited clinical usefulness. Prediction accuracy would benefit from enhanced data quality within the registry and this preliminary study holds promise for future model generation as the DHAR matures. Ongoing collection of high-quality data by the DHAR should enable improved patient-specific outcome prediction that is generalisable across the population. LEVEL OF EVIDENCE: Level III.

A roadmap to develop clinical guidelines for open surgery of acute and chronic tears of hip abductor tendons.

PURPOSE: Abductor tendon tears are increasingly recognised as a common cause of lateral hip pain. Surgical treatment of these tears has been recommended, but the indications and types of open surgery have not been precisely elucidated yet. This manuscript aimed to critically review the literature concerning all open treatment options for this condition while identifying knowledge gaps and introducing a treatment algorithm. METHODS: Literature search was conducted, including PubMed, Cochrane library, ScienceDirect and Ovid MEDLINE from 2000 to May 2020. Inclusion criteria were set as: (i) clinical studies reporting outcomes following open surgical treatment of acute or chronic hip abductor tendon tears, (ii) studies reporting an open direct or augmented suturing or muscle transfer procedure, (iii) acute or chronic tears found in native or prosthetic hips. RESULTS: A total of 34 studies published between 2004 and 2020 were included. The vast majority of studies were uncontrolled case series of a single treatment method. A total of 970 patients (76% women) with an age range between 48 and 76 years were involved. Women between 60 and 75 years old were most commonly treated. Preoperative evaluation of patients and reporting of open surgical technique and outcomes are inconsistent. All studies reported variable improvement of pain, functional outcomes and gait of patients. Overall, complication rates ranged from 0 to 31.2%. CONCLUSION: The current literature on this topic is highly heterogeneous, and the overall level of the available evidence is low. A roadmap to develop practical guidelines for open surgery of acute and chronic tears of abductor tendons is provided. The anatomy and chronicity of the lesion, the extent of fatty infiltration and neurologic integrity of hip abductor muscles may influence both treatment choice and outcome. Further high-quality studies with standardisation of preoperative evaluation of patients and reporting of outcomes will help delineate best treatments. LEVEL OF EVIDENCE: IV.

Clinical outcomes after revision hip arthroscopy in patients with femoroacetabular impingement syndrome (FAIS) are inferior compared to primary procedures. Results from the Danish Hip Arthroscopy Registry (DHAR).

PURPOSE: As many as 10% of primary hip arthroscopies end up with a revision arthroscopy procedure when treating patients suffering from femoroacetabular impingement syndrome (FAIS). In general, revision procedures are indicated because of residual impingement, but only a few studies present outcome data from revision hip arthroscopy after failed FAIS surgical treatment. The purpose of this study was to evaluate clinical outcomes after revision hip arthroscopy in a FAIS cohort and compare outcomes with a primary FAIS hip arthroscopy cohort and describe potential causes of failure after the primary hip arthroscopy. It was hypothesized that subjective outcomes improve after revision hip arthroscopy although outcomes were expected to be inferior to primary hip arthroscopic outcomes. METHODS: Three-hundred and thirty-one arthroscopic revision hip FAIS patients were included from the Danish Hip Arthroscopy Registry (DHAR). Patient-related outcome measures (PROM's), Copenhagen Hip and Groin Outcome Scores (HAGOS), Hip Sports Activity Scale (HSAS), EQ-5D and Numeric Rating Scale (NRS) pain, were assessed in the study cohort prior to the primary procedure and at revision and at follow-up one year after the revision procedure. These data were compared with 4154 primary hip arthroscopic FAIS patients. RESULTS: One-year after revision surgery, mean follow-up (in months ± SD): 12.3 ± 1.6, significant improvements (p < 0.05) in all PROMs was demonstrated, but FAIS patients in the primary hip arthroscopic cohort demonstrated significantly higher outcomes, in all PROMs, when compared at one-year follow-up. Scar tissue, residual osseous impingement and insufficient healing of the labral repair were reported as the main reasons for revision surgery. The conversion to total hip arthroplasty was low (6.4%). CONCLUSION: Revision hip arthroscopy in FAIS patients improves subjective outcomes significantly, although they are poorer than after primary FAIS hip arthroscopy. Main reasons for revision arthroscopy was scar tissue, residual femoroacetabular impingement and insufficient healing of labral repair. LEVEL OF EVIDENCE: Level III.

Despite patient-reported outcomes improve, patients with femoroacetabular impingement syndrome do not increase their objectively measured sport and physical activity level 1 year after hip arthroscopic surgery. Results from the HAFAI cohort.

PURPOSE: Patients with femoroacetabular impingement syndrome (FAIS) are young and middle-aged persons living physically active lives including sports activities. However, measurements of the physical activity level before and after hip arthroscopic surgery in patients with FAIS using both self-reported and objective accelerometer-based measures are lacking. Furthermore, comparing patients with a reference group of persons reporting no hip problems and conducting subgroup analyses investigating changes in physical activity level and self-reported outcomes according to pre-surgery activity level may further highlight the activity pattern for patients. METHODS: Sixty patients with FAIS eligible for hip arthroscopic surgery were consecutively included in a prospective cohort study (HAFAI cohort) together with 30 reference persons reporting no hip problems. Participants completed the Copenhagen Hip and Groin Outcome Score (HAGOS) together with questions regarding their sports activities. Furthermore, participants wore a three-axial accelerometer for five consecutive days during waking hours. The accelerometer-based data were analysed and presented as total activity and type, frequency and duration of activities. RESULTS: Patients experienced significant and clinically relevant changes in all HAGOS scores. 88% of patients participated in some kind of sports activity 1 year after surgery. Overall, objectively measured physical activity did not change from before to 1 year after surgery. However, subgroup analyses of the most sedentary patients preoperatively revealed significant changes towards a more active pattern. Compared to reference persons, patients performed less bicycling and running. CONCLUSION: Despite clinically relevant changes in self-reported outcomes, patients did not increase their overall physical activity level 1 year after surgery. Physical activity levels were lower in patients than in the reference group and patients continued bicycling and running less compared with the reference group. LEVEL OF EVIDENCE: II.

Danish Hip Arthroscopy Registry: predictors of outcome in patients with femoroacetabular impingement (FAI).

PURPOSE: Predictors of outcome after femoroacetabular impingement (FAI) surgery are not well-documented. This study presents data from the Danish Hip Arthroscopy Registry (DHAR) for such analyses. The purpose of this study was to identify predictors of poor outcome after FAI surgery in a Danish FAI population. The primary hypothesis was that older patients, patients with severe cartilage damage and female patients might have inferior outcome results compared with younger patients, patients with minor cartilage damage and male patients. METHODS: Radiological and surgical data as well as patient-reported outcome measures (PROM) from FAI patients in DHAR between January 2012 and May 2015 were collected. PROMs consisting of Copenhagen Hip and Groin Outcome Score (HAGOS), quality of life (EQ-5D), Hip Sports Activity Scale (HSAS) and Numeric Rating Scale (NRS) pain scores were assessed. The patients were divided into three age groups (< 25, 25-39 and ≥ 40 years). Cartilage injuries were classified according to International Cartilage Repair Society (ICRS) (femoral side) and modified Becks (acetabular side) classifications. A non-parametric statistic method was used to analyze the differences between the preoperative and postoperative PROM values. RESULTS: Data from 2054 FAI procedures in DHAR was collected. 53% of the procedures were done in female patients. All HAGOS sub-scales, EQ-5D, HSAS and NRS pain (rest and walk) demonstrated significant improvements in all age groups at follow-up. Comparison between age groups demonstrated poorer outcomes in both older age groups when compared with the < 25 years age group at 1- and 2-year follow-ups. Higher degrees of femoral and acetabular cartilage injury did have a negative influence on outcome at follow-up. Comparison between genders demonstrated lower preoperative outcomes in females and lower outcome score (HSAS) 1 and 2 years after FAI surgery. CONCLUSIONS: Age above 25 and major cartilage injury might negatively affect the outcome of surgery, however, gender could not be identified as a negative predictor of clinical outcome after FAI surgery, but might negatively affect sports participation in females. LEVEL OF EVIDENCE: III, prospective cohort study.

Pain, activities of daily living and sport function at different time points after hip arthroscopy in patients with femoroacetabular impingement: a systematic review with meta-analysis.

AIM: To investigate pain, activities of daily living (ADL) function, sport function, quality of life and satisfaction at different time points after hip arthroscopy in patients with femoroacetabular impingement (FAI). DESIGN: Systematic review with meta-analysis. Weighted mean differences between preoperative and postoperative outcomes were calculated and used for meta-analysis. DATA SOURCES: EMBASE, MEDLINE, SportsDiscus, CINAHL, Cochrane Library, and PEDro. ELIGIBILITY CRITERIA FOR SELECTING STUDIES: Studies that evaluated hip pain, ADL function, sport function and quality of life before and after hip arthroscopy and postoperative satisfaction in patients with symptomatic FAI. RESULTS: Twenty-six studies (22 case series, 3 cohort studies, 1 randomised controlled trial (RCT)) were included in the systematic review and 19 in the meta-analysis. Clinically relevant pain and ADL function improvements were first reported between 3 and 6 months, and sport function improvements between 6 months and 1 year after surgery. It is not clear when quality of life improvements were first achieved. On average, residual mild pain and ADL and sport function scores lower than their healthy counterparts were reported by patients following surgery. Postoperative patient satisfaction ranged from 68% to 100%. CONCLUSIONS: On average, patients reported earlier pain and ADL function improvements, and slower sport function improvements after hip arthroscopy for FAI. However, average scores from patients indicate residual mild hip pain and/or hip function lower than their healthy counterparts after surgery. Owing to the current low level of evidence, future RCTs and cohort studies should investigate the effectiveness of hip arthroscopy in patients with FAI. TRIAL REGISTRATION NUMBER: CRD42015019649.

Analgesic effect of hamstring block after anterior cruciate ligament reconstruction compared with placebo: a prospective randomized trial.

PURPOSE: To evaluate the effect of a hamstring block for postoperative pain management using 20 mL of 0.25% bupivacaine compared with placebo after anterior cruciate ligament (ACL) reconstruction with a hamstring autograft. METHODS: In a 3-month period, 45 patients undergoing ACL reconstruction with a hamstring autograft who all received a femoral nerve block were randomized to receive either 20 mL of 0.25% bupivacaine or 20 mL of saline water administered through a catheter into the donor-site space. The patients and recovery staff were blinded to the treatment. Postoperative donor-site pain was evaluated subjectively by the patients using a pain score (Likert scale from 0 to 10). The pain was registered for each hour in the first 6 hours and thereafter once daily for 8 days. Furthermore, the requirement for postoperative analgesic medicine was registered. RESULTS: The hamstring block group (n = 23) had significantly less pain for each of the first 6 postoperative hours. The pain score was reduced from 4.2 to 2.3 (95% confidence interval, 1.3 to 3.3) (P = .01) in the first hour and from 2.8 to 1.3 (95% confidence interval, 0.6 to 1.9) in the sixth hour, and there was a significantly lower overall requirement for early postoperative fentanyl, reduced from a mean of 58 to 35 µg (P = .02), and morphine, reduced from a mean of 10 to 6 mg (P = .04). After 6 hours, there was no difference in the pain level and use of analgesics between the 2 groups. CONCLUSIONS: With the use of a donor-site block in hamstring ACL reconstruction, the donor-site pain level, as well as the overall requirement for fentanyl and morphine, was significantly reduced in the first 6 postoperative hours. No effect of the donor-site block was seen after 6 hours. LEVEL OF EVIDENCE: Level I, therapeutic, randomized controlled study.

Outcome of arthroscopic treatment for symptomatic femoroacetabular impingement.

BACKGROUND: Recently, arthroscopic-based treatment for hip-related pain with radiological findings of femoroacetabular impingement and labral lesions has been developed.We aim to present clinical outcome in a single centre patient cohort of patients treated arthroscopically for hip-related pain due to femoroacetabular impingement. METHODS: A total of 117 consecutive patients operated in 2009-2011 were included in this prospective case series (41% male; mean age 37 years; (range 15-70). The indication for arthroscopic treatment of hip-related pain was mechanical hip symptoms and radiological findings of femoroacetabular impingement.To evaluate hip function and pain level at 1-year and 2-5 years follow up (FU) mHHS (Modified Harris Hip Score), HOS (Hip Outcome Score) and a Numeric Rating Scale (NRS) pain score were used. RESULTS: Labral tears were seen in 91% of the hip arthroscopies. Cartilage lesions (ICRS grade 2 and above) were seen at the acetabular and femoral articular surfaces in 79% and 15% of cases, respectively. The therapeutic procedures were in 99% of the arthroscopies osteochondroplasty and/or acetabular rim-trimming. In 77% of procedures labral reattachment was performed. The patient evaluated outcome demonstrated significant increases in mHHS and HOS at 1-year follow up and at final FU compared to preoperatively (1 yr: mHHS: 72.1 to 85.3, HOS: 71.4 to 85.1; final FU: mHHS: 72.1 to 83.8, HOS: 71.4 to 83.7). Pain levels decreased significantly from preoperatively to follow ups. Five patients underwent total hip replacement within the follow up period after hip arthroscopy. CONCLUSIONS: Arthroscopic treatment of femoroacetabular impingement improves patient evaluated outcomes. Further studies are needed to determine failure rates and risk factors.

Is quadriceps tendon a better graft choice than patellar tendon? a prospective randomized study.

PURPOSE: The purpose of this randomized controlled study was to compare knee stability, kneeling pain, harvest site pain, sensitivity loss, and subjective clinical outcome after primary anterior cruciate ligament (ACL) reconstruction with either bone-patellar tendon-bone (BPTB) or quadriceps tendon-bone (QTB) autografts in a noninferiority study design. METHODS: From 2005 to 2009, a total of 51 patients were included in the present study. Inclusion criteria were isolated ACL injuries in adults. Twenty-five patients were randomized to BPTB grafts and 26 to QTB grafts. An independent examiner performed follow-up evaluations 1 and 2 years postoperatively. Anteroposterior knee laxity was measured with a KT-1000 arthrometer (MEDmetric, San Diego, CA). Anterior knee pain was assessed clinically and by knee-walking ability. Knee Injury and Osteoarthritis Outcome Score (KOOS) and subjective International Knee Documentation Committee (IKDC) score were used for patient-evaluated outcome. RESULTS: Anterior knee laxity was equal between the 2 groups with KT-1000 values of 1.1 ± 1.4 mm and 0.8 ± 1.7 mm standard deviation (SD) at follow-up in QTB and BPTB groups, respectively (P = .65), whereas positive pivot shift test results were seen less frequently (14% compared with 38%, respectively; P = .03). Anterior kneeling pain, evaluated by the knee walking ability test, was significantly less in the QTB group, with only 7% of patients grading knee walking as difficult or impossible compared with 34% in the BPTB group. At 1 and 2 years' follow-up, there was no difference between the 2 groups in subjective patient-evaluated outcome. The IKDC score was 75 ± 13 patients and 76 ± 16 SD at 1-year follow-up in QTB and BPTB groups, respectively (P = .78). At 2 years, 12 patients were lost to follow-up, resulting in 18 in the BPTB group and 21 in the QTB group. CONCLUSIONS: The use of the QTB graft results in less kneeling pain, graft site pain, and sensitivity loss than seen with BPTB grafts; however, similar anterior knee stability and subjective outcomes are seen. The results of this study show that QTB is a viable option for ACL reconstruction. LEVEL OF EVIDENCE: Level II, randomized controlled clinical trial.

Open surgical repair of hip abductor tendon tears.

INTRODUCTION: Tendinopathy and tendon tears of the gluteus medius and/or minimus (GMM) insertion at the greater trochanter are increasingly recognised internationally as a cause of recalcitrant lateral hip pain (LHP). The purpose of this study was to report the first Danish results of open surgical repair of GMM tears in female patients. METHODS: In this retrospective observational study, we included 67 women (68 hips) with a mean (95% confidence interval (CI)) age of 59 (56-61) years who underwent open GMM repair between September 2018 and June 2022. All cases had magnetic resonance imaging before surgery. Pre-, three- and 12-month post-operative testing included LHP (numerical rating scale 0-10), Copenhagen Hip and Groin Outcome Score (HAGOS), Oxford Hip Score (OHS), the EuroQol-Visual Analogue Scale (EQ-VAS) and the Global Rating of Change score (GROC). Responses on GROC were considered successful if patients scored "moderately better" to "very much better". Function of the lower limbs was assessed by the 30-second Chair-Stand-Test (CST). RESULTS: From pre-testing to 12-month follow-up, LHP at rest and during activity decreased significantly, all HAGOS subgroups improved by 27-35 points, the OHS improved from 22 to 35 points, the EQ-VAS improved from 52 to 72 points and the mean (95% CI) number of repetitions in the CST improved by 2.4 (1.4-3.3). Success on the GROC was reported by 79% of the patients. CONCLUSION: Open surgical repair of GMM tendon tears in women produced statistically significant improvements in patient-reported outcomes at one-year follow-up. FUNDING: None. TRIAL REGISTRATION: Not relevant.

Subpectineal obturator nerve block reduces opioid consumption after hip arthroscopy: a triple-blind, randomized, placebo-controlled trial.

BACKGROUND: Hip arthroscopy causes severe pain during the first few hours in the postoperative care unit. This is probably due to the intraoperative stretching of the hip joint capsule. Pain relief requires high doses of opioids which may prolong recovery and may cause opioid-related adverse events.The majority of hip joint capsule nociceptors are located anteriorly. The obturator nerve innervates the anteromedial part of the hip joint capsule. We hypothesized that a subpectineal obturator nerve block using 15 ml bupivacaine 5 mg/mL with added epinephrine 5 µg/mL would reduce the opioid consumption after hip arthroscopy. METHODS: 40 ambulatory hip arthroscopy patients were enrolled in this randomized, triple-blind controlled trial. All patients were allocated to a preoperative active or placebo subpectineal obturator nerve block. The primary outcome was opioid consumption for the first 3 hours in the postanesthesia care unit. Secondary outcomes were pain, nausea, and hip adductor strength. RESULTS: 34 patients were analyzed for the primary outcome. The mean intravenous morphine equivalent consumption in the subpectineal obturator nerve block group was 11.9 mg vs 19.7 mg in the placebo group (p<0.001). The hip adductor strength was significantly reduced in the active group. No other intergroup differences were observed regarding the secondary outcomes. CONCLUSION: We found a significant reduction in the opioid consumption for patients receiving an active subpectineal obturator nerve block. The postoperative intravenous morphine equivalent reduction the first painful 3 hours was reduced by 40% for patients receiving a subpectineal obturator nerve block in this randomized, triple-blind trial. TRIAL REGISTRATION NUMBER: EudraCT database 2021-006575-42.

First-line treatment for femoroacetabular impingement syndrome and hip-related quality of life: study protocol for a multicentre randomised controlled trial comparing a 6-month supervised strength exercise intervention to usual care (the Better Hip Trial).

INTRODUCTION: Femoroacetabular impingement syndrome (FAIS) is a motion-related and position-related clinical condition of the hip associated with pain, reduced physical function and hip-related quality of life (QoL). Interestingly, higher maximal muscle strength is associated with less pain, better physical function and improved QoL in people with FAIS. Furthermore, preliminary evidence suggests that a proportion of patients with FAIS respond positively to strength exercise as first-line treatment. Nonetheless, there is little evidence supporting a specific exercise intervention offered as a first-line treatment. We will conduct a randomised controlled trial investigating the clinical effectiveness and cost-effectiveness of a 6-month strength exercise intervention compared with usual care as first-line treatment in patients with FAIS. METHODS AND ANALYSIS: This is a multicentre randomised controlled trial that will be conducted at hospitals and physiotherapy clinics across Denmark and Australia. A total of 120 patients with FAIS will be randomised (1:1) to 6 months of supervised strength exercise or usual care. The primary outcome is the change in hip-related QoL measured using the International Hip and Outcome Tool 33 (iHOT-33) from baseline to the end of intervention. A health economic evaluation will be conducted from a societal and healthcare perspective based on the data collection over a 12-month period starting at baseline. The analysis will calculate incremental cost-effectiveness ratios using quality-adjusted life-years and iHOT-33 scores while estimating costs using microcosting and cost questionnaires. Secondary outcomes include objectively measured physical function at baseline and after 6 months and patient-reported outcomes measured at baseline, 3-month, 6-month and 12-month follow-up. ETHICS AND DISSEMINATION: The trial has been approved by the Committee on Health Research Ethics in the Central Denmark Region (journal no 1-10-72-45-23) and La Trobe University Human Ethics Committee (HEC24042) and is registered at the Central Denmark Region List of Research Projects (journal no 1-16-02-115-23). Informed consent will be obtained from each participant before randomisation. Results will be published in international peer-reviewed scientific journals. TRIAL REGISTRATION NUMBER: NCT05927935.

Efficacy of iliopsoas plane block for patients undergoing hip arthroscopy: a prospective, triple-blind, randomized, placebo-controlled trial.

BACKGROUND: Intraoperative stretching of the hip joint capsule often generates severe pain during the first 3 hours after hip arthroscopy. The short-lived severe pain mandates high opioid consumption, which may result in adverse events and delay recovery. The femoral nerve nociceptors are located anteriorly in the hip joint capsule. A femoral nerve block reduces pain and opioid demand after hip arthroscopy. It impedes, however, ambulation and home discharge after outpatient surgery. The iliopsoas plane block selectively anesthetizes the femoral sensory nerve branches innervating the hip joint capsule without compromising ambulation. We aimed to assess reduction of opioid consumption after iliopsoas plane block during the short-lived painful postsurgical period of time after hip arthroscopy. METHODS: In a randomized, triple-blind trial, 50 patients scheduled for hip arthroscopy in general anesthesia were allocated to active or placebo iliopsoas plane block. The primary outcome was opioid consumption during the first three postoperative hours in the postanesthesia care unit. Secondary outcomes included pain, nausea, and ability to ambulate. RESULTS: Forty-nine patients were analyzed for the primary outcome. The mean 3-hour intravenous morphine equivalent consumption in the iliopsoas plane block group was 10.4 mg vs 23.8 mg in the placebo group (p<0.001). No intergroup differences were observed for the secondary outcomes during the postoperative follow-up. CONCLUSION: An iliopsoas plane block reduces opioid consumption after hip arthroscopy. The reduction of opioid consumption during the clinically relevant 3-hour postsurgical period of time was larger than 50% for active versus placebo iliopsoas plane block in this randomized, triple-blind trial.

Medium to long-term follow-up after ACL revision.

PURPOSE: The aim of the present study is to present epidemiology and clinical outcome after revision anterior cruciate ligament (ACL) reconstruction with an intermediate follow-up time of up to 9 years. METHODS: A retrospective study of patients treated with ACL revision from 2001 to 2007 at a university referral clinic was conducted. Study follow-up was performed in 2010; this follow-up included objective IKDC scores, KOOS, Tegner and SANE subjective scores, KT-1000 knee laxity measurements and registration of reoperations and complications. RESULTS: One hundred and twenty-eight patients were available for follow-up. Median follow-up time was 6 (2-9) years. Mean age was 32 years, 50% were men. Eleven percent required staged procedures, 30% were reconstructed with allograft tendons and 23% had collateral ligament reconstruction in combination with the ACL revision. SANE knee global score (0-100) was 74 at follow-up, KOOS sub-scores were preoperatively 66, 69, 77, 42 and 39 for pain, symptoms, activity of daily living, sports and quality of life, respectively. At follow-up, scores were 70, 76, 81, 50 and 50, respectively. Sport and quality of life scores increased significantly. KT-1000 was 6.2 mm preoperatively and 2.5 at follow-up (P < 0.05). Six percent were re-revised and 2 patients had total knee replacements. CONCLUSION: Despite objective findings of acceptable sagittal knee stability at follow-up, subjective outcome scores indicate significant knee impairment with low scores in sport and quality of life. A re-revision rate of 6% after 6 years is acceptable. It is imperative that patients eligible for ACL revision receive proper counseling in terms of outcome expectancies. LEVEL OF EVIDENCE: Retrospective case series, Level IV.

Low prevalence of trochanteric bursitis in patients with refractory lateral hip pain.

INTRODUCTION: Bursitis at the greater trochanter has historically been identified as a major pain generator in patients with lateral hip pain (LHP). We believe that hip abductor tendon pathology (HATP) plays an important and overlooked role in LHP. The purpose of this study was to evaluate the presence of isolated trochanteric bursitis on MRI in patients with refractory LHP. METHODS: The MRIs of 120 patients with LHP (94% women, median age 54 years) performed at our orthopaedic outpatient clinic between 2017 and 2020 were evaluated by two raters for trochanter-related pathologies, including HATP and bursitis. RESULTS: Two (2%) patients were registered with greater trochanteric bursitis with no relevant HATP, 30 (25%) patients had elements of inflammation (high-intensity signals) in the greater trochanteric bursa with relevant HATP. Five (4%) patients had relevant HATP with bursitis in the sub-gluteus minimus bursa with no bursitis in the greater trochanteric bursa. The remaining 83 (69%) patients had no sign of trochanter-related bursitis. CONCLUSION: Isolated trochanteric bursitis as the cause of refractory LHP appears to be rare. We believe that the presence of HATP in LHP has been severely underestimated and a shift in focus towards treatment of these structures is necessary. FUNDING: none. TRIAL REGISTRATION: According to current national legislation, no formal ethical approval was required for this study. The National Data Protection Agency approved the study (1-16-02-124-19).

Five-Year Follow-up After Hip Arthroscopic Surgery in the Horsens-Aarhus Femoroacetabular Impingement (HAFAI) Cohort.

Background: Patients with femoroacetabular impingement syndrome (FAIS) are offered hip arthroscopic surgery to decrease hip pain, improve their function, and decrease development of hip osteoarthritis (OA). Nonetheless, long-term follow-up data are few. Purpose: To investigate patient-reported outcomes, clinical tests, reoperations, and radiographic status 5 years after primary hip arthroscopy in patients with FAIS. Study Design: Case series; Level of evidence, 4. Methods: A total of 60 patients (age, 36 ± 9 years; 63% female) diagnosed with FAIS were included in the study and followed for 5 years after hip arthroscopy. Follow-up included Copenhagen Hip and Groin Outcome Score (HAGOS); Hip Sports Activity Scale; and clinical tests (flexion, adduction, internal rotation [FADIR]; flexion, abduction, external rotation [FABER]; and psoas muscle/tendon major pain provocation). Radiographic evaluation included lateral joint-space width (LJSW) and Tönnis classification for hip OA. Reoperations and conversion to total hip replacement (THR) were recorded. We calculated the proportion of patients who exceeded the minimal important change (MIC), achieved the Patient Acceptable Symptom State (PASS), and were within the 95% reference interval of age- and sex-matched persons with no hip problems. Changes were investigated using paired t tests. Results: Compared with preoperatively, all HAGOS subscales were improved substantially 5 years after surgery (mean, ≥21 points; P < .001), and 67% to 89% of patients reported improvements exceeding MIC. Between 56% and 80% achieved PASS, but only 7% to 24% reached the 95% reference interval for the HAGOS subscales. A total of 36% had a positive FADIR test and 25% had a positive FABER test, which were improvements compared with preoperatively (P < .001 for both). Patients with a positive FADIR test had significantly worse HAGOS subscales. Six patients (10%) had a THR since their primary hip arthroscopy. In the remaining patients, the mean LJSW was decreased (-0.4 mm; P = .043), and hip OA had worsened in 9 patients (23%; P = .003). Conclusion: Five years after surgery, the majority of patients experienced HAGOS improvements exceeding MIC while also showing an acceptable PASS. However, clinical tests, participation in physical activities, and quality of life indicated that many patients still experience hip problems. Registration: NCT04590924 (ClinicalTrials.gov identifier).

Outcome of surgical treatment of arthrofibrosis following ligament reconstruction.

PURPOSE: Clinical outcome following surgical treatment and intensive physiotherapy was evaluated in patients with arthrofibrosis as a complication to varying knee-ligament reconstructions. METHODS: From 2003 to 2007, 31 patients underwent surgery for arthrofibrosis as a postoperative complication following knee-ligament reconstruction. Treatment for reduced range of motion consisted of forced manipulation or arthroscopic arthrolysis followed by intensive physiotherapy. Twenty-seven patients (12 men and 15 women; median age 35(12-70) years) were followed up. Objective examination, Pain, KOOS and Tegner scores were used to evaluate the clinical outcome at follow-up. RESULTS: Fourteen patients were treated with forced manipulation alone, and the remaining thirteen were treated with forced manipulation and arthroscopic arthrolysis. The patients' median follow-up was 51 months (19-73 months). Median interval between primary surgery and surgical release was 4 (1-32) months. Median range of motion (ROM) improved from -0°(0 to 20) to 0°(+2-9) in extension deficit and from 90°(40-145) to 130°(90-155) in flexion. Mean KOOS score were symptoms 63, pain 72, ADL 77, sport 42, QOL 45. Median Tegner score was 4 (2-9). CONCLUSION: Surgical arthrolysis combined with intensive physiotherapy improved range of motion to nearly normal values. Subjective outcome scores revealed relatively poor outcome levels compared to uncomplicated knee-ligament reconstruction. Predictors of poor outcome were global arthrofibrosis and greater than 6-month time interval from primary reconstruction and surgical release. LEVEL OF EVIDENCE: Retrospective clinical case series, Level IV.

Os acetabuli-a new arthroscopic treatment option for the acetabular rim fracture.

Os acetabuli (Os) or acetabular rimfractures are often seen in femoroacetabular impingement patients and can result in groin pain. When seen in symptomatic patients, the question is whether to remove them or to fixate the loose fragment to the acetabular rim. This depends on acetabular coverage and the extent of the Os. If removal of the Os might lead to hip dysplasia and instability, fixation of the Os should be the goal. This technical article describes the author's technique in fixating the Os with a suture-bridge technique.

Gluteal-related lateral hip pain.

INTRODUCTION: Lateral hip pain (LHP) due to tendon pathologies of insertion of the M. gluteus medius and minimus at the greater trochanter are often misdiagnosed and may lead to unrecognised disability. The purpose of this study was to evaluate pain and patient-reported outcomes in patients presenting with LHP in the context of a publicly financed healthcare system. METHODS: Data were collected from September 2017 to November 2020 at a regional teaching hospital. Inclusion criteria were clinical and MRI-verified hip abductor tendon pathology. Baseline testing included pain scoring (numerical rating scale, NRS), and the following patient-reported outcome scores: Copenhagen Hip and Groin Outcome Score (HAGOS), Oxford Hip Score (OHS) and EuroQol-Visual Analogue Scale (EQ-VAS). RESULTS: A total of 151 patients (94% women) with a median age of 55 years were included. The mean LHP (NRS 0-10) at rest, during activity and worst pain at any given time was 4, 7 and 9, respectively. The mean patient-reported outcome scores were HAGOS: pain 42.9, symptoms 49.8, activities of daily living 42.2, sport/recreation 28.1, participation in physical activities 25, quality of life 27.8; OHS 24; EQ-VAS 59.6. CONCLUSIONS: We found that patients with hip abductor tendon pathology display poor patient-reported outcomes comparable to those of patients suffering from severe hip osteoarthrosis. Further research into this patient group is warranted. The results are based on a heterogeneous study population in terms of variety of hip abductor tendon pathology and comorbidities and need to be interpreted as such. FUNDING: none. TRIAL REGISTRATION: According to current Danish law, no formal ethical approval was required for this study. The National Data Protection Agency approved the study (1-16-02-125-19).

Anatomic reconstruction of the posterolateral corner of the knee: a case series with isolated reconstructions in 27 patients.

PURPOSE: This study presents clinical results of a case series of isolated reconstruction of the posterolateral corner (PLC) with a new technique that aims to reconstruct the lateral collateral ligament (LCL), popliteus tendon, and popliteofibular ligament. METHODS: From 1997 to 2005, 27 patients available for follow-up with isolated posterolateral instability were treated with primary reconstruction of the LCL and PLC. The median age was 28 years, and there were 16 male patients. Of the patients, 26% had remaining instability after anterior or posterior cruciate ligament reconstruction. All underwent reconstruction with a novel technique addressing both the LCL and the PLC by use of hamstring autografts. Follow-up was more than 24 months, and patients were examined by an independent observer using the International Knee Documentation Committee objective measures and subjective Knee Injury and Osteoarthritis Outcome Scores. RESULTS: In our series 95% of patients with isolated lateral rotatory instability had rotatory stability after PLC reconstruction. On the basis of International Knee Documentation Committee scoring, 71% were normal or nearly normal. Subjective Knee Injury and Osteoarthritis Outcome Scores were comparable to scores in patients after meniscectomy. One patient had a deep infection, but none had any peroneal nerve injury. CONCLUSIONS: This case series presents a new method for combined reconstruction of the LCL and the PLC. Despite the extensiveness of procedure, complications were low. The technique restores lateral stability clinically at 2 years' follow-up. LEVEL OF EVIDENCE: Level IV, therapeutic case series.