Utility of Preoperative Shear-Wave Elastography of the Supraspinatus Muscle for Predicting Successful Rotator Cuff Repair: A Prospective Observational Study With MRI Correlation.

BACKGROUND. After rotator cuff tear, properties of the torn muscle predict failed surgical repair. OBJECTIVE. The purpose of our study was to explore the utility of preoperative shear-wave elastography (SWE) measurements of the supraspinatus muscle to predict successful rotator cuff repair, including comparison with MRI-based measures. METHODS. This prospective study included 74 patients (37 men, 37 women; mean age, 63.9 ± 10.0 [SD] years) who underwent rotator cuff repair between May 2019 and January 2021. Patients underwent preoperative clinical shoulder MRI and investigational shoulder ultrasound including SWE using shear modulus. The mean elasticity values of the supraspinatus and trapezius muscles were measured, and the elasticity ratio (i.e., ratio of mean elasticity of supraspinatus muscle to mean elasticity of trapezius muscle) was calculated. The muscular fatty infiltration score (1-3 scale) was recorded on gray-scale ultrasound. On MRI, muscular fatty infiltration was assessed by Goutallier grade (0-4 scale), and muscular atrophy was assessed by the occupation ratio (ratio of cross-sectional areas of supraspinatus muscle and supraspinatus fossa) and by the muscle atrophy grade (0-3 scale). After rotator cuff repair, the surgeon classified procedures as achieving sufficient (n = 60) or insufficient (n = 14) repair. RESULTS. Patients with insufficient repair, versus those with sufficient repair, more commonly exhibited a large (3-5 cm) tear (100.0% vs 50.0%). Patients with insufficient, versus sufficient, repair exhibited higher mean Goutallier grade (3.8 ± 0.4 vs 1.9 ± 1.1), mean muscle atrophy grade (2.0 ± 0.8 vs 0.5 ± 0.7), mean supraspinatus elasticity (44.15 ± 8.06 vs 30.84 ± 7.89 kPa), mean elasticity ratio (3.66 ± 0.66 vs 1.83 ± 0.58), and mean gray-scale fatty infiltration grade (2.86 ± 0.36 vs 1.63 ± 0.66) and showed lower mean occupation ratio (0.3 ± 0.1 vs 0.6 ± 0.1) (all, p < .001). AUC for predicting insufficient repair was 0.945 for Goutallier grade, 0.961 for occupation ratio, 0.900 for muscle atrophy grade, 0.874 for mean elasticity, 0.971 for elasticity ratio, and 0.912 for gray-scale fatty infiltration grade. Elasticity ratio (cutoff ≥ 2.51) achieved sensitivity of 100.0% and specificity of 90.0% for insufficient repair. At multivariable analysis including tear size, the three MRI measures, elasticity ratio, and gray-scale fatty infiltration grade, the only independent predictors of insufficient repair were muscle atrophy grade of 2-3 (odds ratio [OR] = 9.3) and elasticity ratio (OR = 15.7). CONCLUSION. SWE-derived elasticity is higher in patients with insufficient rotator cuff repair; the elasticity ratio predicts insufficient repair independent of tear size and muscle characteristics. CLINICAL IMPACT. Preoperative SWE may serve as a prognostic marker in patients with rotator cuff tear.

Comparison of Hook Plate Fixation Versus Arthroscopic Coracoclavicular Fixation Using Multiple Soft Anchor Knots for the Treatment of Acute High-Grade Acromioclavicular Joint Dislocations.

PURPOSE: To compare the clinical and radiologic outcomes of arthroscopically assisted coracoclavicular (CC) fixation using multiple soft anchor knots versus hook plate fixation in patients with acute high-grade Rockwood type III and V acromioclavicular (AC) joint dislocations. METHODS: This retrospective study included 22 patients with acute Rockwood type III and V AC joint dislocations who underwent arthroscopic fixation or hook plate fixation surgery between February 2016 and March 2018. Patients were categorized into 2 groups: arthroscopically assisted CC fixation using multiple soft anchor knots group (AR, n = 12) and hook plate fixation group (HO, n = 10). We measured the CC distances (CCDs) and CCD ratio at 6 months, 1 year, and last follow-up postoperatively to compare the radiologic results between the groups. Clinical outcomes were assessed at 1 year postoperatively and at the last follow-up using the Visual Analog Scale, American Shoulder and Elbow Surgeons (ASES) scores, and Shoulder Pain and Disability Index (SPADI) scores, and the Disabilities of the Arm, Shoulder, and Hand (DASH) questionnaire. Magnetic resonance imaging after hook plate removal was used to evaluate the healing ligaments and tendon-bone interface. RESULTS: The patients in the AR group had better ASES, SPADI, and Quick DASH scores than the patients in the HO group at 1 year postoperatively and at last follow-up. The CCD and CCD ratio were significantly better in the AR group than in the HO group at the last follow-up period (P = .007/0.029). Magnetic resonance imaging findings showed grade I in 60% of patients in the AR group and grade III in 60% of patients in the HO group. AC joint arthritic change was observed in 40% of the HO group. CONCLUSIONS: The CC fixation method using multiple soft anchor knots showed satisfactory results and had superior CC ligament healing ability and maintenance of CCD than hook fixation. LEVEL OF EVIDENCE: Level III, retrospective therapeutic comparative investigation.

A novel diagnostic method to predict subscapularis tendon tear with sagittal oblique view magnetic resonance imaging.

PURPOSE: To find novel measurement guidelines correlating with known tear size on two sagittal oblique views (en-face view and Y-view). METHODS: From a series of arthroscopic rotator cuff repair cases between 2012 and 2015, 50 patients were randomly selected from each of six subscapularis tear classifications. Due to rarity of type IV lesions, 272 shoulders were included. En-face view and Y-view in sagittal plane MRI were selected. Image evaluation was retrospectively performed by two researchers independently. In en-face view, anatomical line connecting the coracoid tip to the glenoid base designated as the base-to-tip line was used for thickness measurement and classification. Grading according to base-to-tip line, overlapped segment of base-to-tip line, thickness of subscapularis, and fluid accumulation were measured. In Y-view, a tangent line was drawn through the scapular spine and the coracoid. Parallel lines were then made. Grading according to tangent line, vertical length, cephalic width, caudal width, and fluid accumulation was measured. RESULTS: In en-face view, grading according to base-to-tip line and overlapped segment of base-to-tip line showed differences in subscapularis tendon tear types IIB, III, and IV compared to the normal group. Thickness of subscapularis showed differences in types III and IV. No significant difference was observed in fluid accumulation. In Y-view, grading according to tangent line, vertical length, cephalic width, and fluid accumulation showed significant differences in types III and IV. Caudal width in Y-view was significantly different only in type IV. CONCLUSION: Several measurement parameters in two additional views in sagittal-oblique MRI (en-face view and Y-view) showed different degrees of subscapularis tendon tears. Grading of base-to-tip line is easy to use and helps diagnose partial subscapularis tear. LEVEL OF EVIDENCE: III.

Does creating a trough on the anterior glenoid rim make a difference in Arthroscopic Bankart repair using suture anchors? A mid-term follow-up retrospective study.

PURPOSE: Creating a trough on the anterior glenoid rim is one of the methods used for arthroscopic Bankart repair with suture anchors. The purpose of this study was to analyze clinical and radiological outcomes of arthroscopic Bankart repair with suture anchors; to compare between the outcomes of surgical procedures with and without trough. METHODS: Clinical and radiological outcomes were evaluated for 116 patients who underwent arthroscopic Bankart repair at our institute from 2005 to 2011. The mean follow-up was 5.2 years (range, 2-8.8 years). All data were divided into trough group (n = 62) and non-trough group (n = 71). Clinical and functional outcomes were assessed pre- and postoperatively as range of motion (ROM), pain on the visual analog scale (p-VAS), function on the visual analog scale (f-VAS), and Rowe score. Radiological outcomes were also evaluated. RESULTS: The overall postoperative clinical and functional outcomes improved significantly (P < .001). A total of 8 patients (6.8%) showed recurrent instability. Radiologic findings showed mild arthritis in 27 cases (23.1%), moderate arthritis in 6 cases (5.1%), and no severe arthritis. 32 patients showed anterior apprehension after surgery, and 22 out of those 32 patients were from non-trough group. However, no significant difference between the trough and non-trough groups was found with respect to clinical and functional outcomes (P > .05). CONCLUSION: The additional procedure of creating a trough did not improve clinical outcomes in terms of frank dislocation; however, at the final follow-up, patients with the trough showed less anterior apprehension. Overall, arthroscopic Bankart repair using suture anchors had relatively good clinical outcome, with a redislocation rate of 6.8%. LEVEL OF EVIDENCE: Level III, Case series.

A Comparative Study to Evaluate the Risk Factors for Medium-Sized Rotator Cuff Tear in Patients Younger Than 50 Years of Age.

PURPOSE: The purpose of this study was to evaluate preoperative and intraoperative factors associated with rotator cuff tears (RCTs) among patients younger than 50 years and to compare arthroscopic rotator cuff repair (RCR) results in patients younger than 50 years (group A) and patients older than 70 years (group B). We also analyzed the results after arthroscopic RCR in these 2 age groups. METHODS: Data were collected from 56 patients allocated to group A and 55 patients allocated to group B who had medium-sized RCTs and had undergone arthroscopic RCR between January 2006 and August 2015. Preoperative variables included demographic data, radiologic data, and surgical procedure. We evaluated fatty degeneration on preoperative magnetic resonance imaging (MRI) and intraoperative variables, including concomitant subscapularis repair, as well as repair technique. Pain visual analog scale, functional visual analog scale, American Shoulder and Elbow Surgeons, and Constant scores were documented to compare functional results in each age group. Postoperative MRI scans were conducted to evaluate the retear rate after RCR after a mean postoperative duration of 5.4 months (range, 2-48 months). RESULTS: Multivariate regression analysis showed acute-on-chronic injury and a history of hypertension were independent factors for differentiation of the groups. Stepwise regression analysis found sex, hypertension, and fatty infiltration of the supraspinatus and infraspinatus to be comparable factors for each group. All patients showed improved results after arthroscopic RCR, but there was no difference between the 2 groups in functional outcomes. However, cuff retears on postoperative MRI scans were found in only 3.9% of the patients in group A versus 16% of the patients in group B. CONCLUSIONS: The results of this study showed that sex, acute-on-chronic injury, and preoperative fatty infiltration of the rotator cuff were significant factors affecting medium-sized RCTs in patients younger than 50 years. In addition, there were no significant differences in functional outcomes after arthroscopic RCR in both groups at 2 years, but postoperative MRI showed a lower retear rate in group A. LEVEL OF EVIDENCE: Level III, retrospective comparative study.

Arthroscopic Incomplete Repair Using a "Hybrid Technique" for Large to Massive Rotator Cuff Tears: Clinical Results and Structural Integrity.

PURPOSE: The first aim of this study was to introduce the concept of hybrid repair (incomplete repair) for large to massive rotator cuff tears and to report clinical results and structural integrity of patients with a minimum 2-year follow-up. The second aim was to compare arthroscopic hybrid repair with partial repair for large to massive rotator cuff tears. METHODS: We retrospectively evaluated 65 patients who underwent arthroscopic incomplete (hybrid) repair (45 patients) or partial repair (20 patients) for large to massive cuff tears from March 2011 to January 2015. The pain visual analog scale, function visual analog scale, American Shoulder and Elbow Surgeons, and Constant scores and range of motion (ROM) (active flexion, elevation, abduction, external rotation, and internal rotation) were assessed preoperatively, at first follow-up (approximately 6 months postoperatively), at second follow-up (1 year postoperatively), and at final follow-up (2 years postoperatively). The healing status of the repaired tendon was evaluated with postoperative magnetic resonance imaging, with a focus on tendon integrity. RESULTS: Comparisons of the preoperative values and final follow-up results of hybrid repair showed significant improvement in the mean pain visual analog scale score (5.56 and 0.93, respectively), mean function visual analog scale score (4.77 and 8.59, respectively), and questionnaire results (American Shoulder and Elbow Surgeons score, 44.89 and 84.67, respectively; Constant score, 44.27 and 73.46, respectively) (all P ≤ .001). Most shoulder ROM measures showed some improvement compared with presurgical ROM at last follow-up (≥2 years). However, there was no statistical significance. Retears occurred in 9 patients (20%) in the hybrid-repair group. Most of the postoperative clinical outcomes showed excellent results with hybrid repair compared with partial repair. CONCLUSIONS: Arthroscopic incomplete repair (hybrid technique) showed more satisfactory clinical trial outcomes than partial repair of large to massive rotator cuff tears. Therefore, we propose the use of incomplete repair, which provides improvements in both pain and functional outcomes, as another repair option for large to massive rotator cuff tears. LEVEL OF EVIDENCE: Level III, retrospective comparative study.

Clinical and radiologic outcome of arthroscopic rotator cuff repair: single-row versus transosseous equivalent repair.

BACKGROUND: There is ongoing controversy regarding the ideal repair modality for rotator cuff tear, with single-row (SR) repair and double-row transosseous equivalent (TOE) repair as the main contenders. METHODS: This study included 415 patients who underwent arthroscopic rotator cuff type I (complete coverage of the greater tuberosity footprint) or II (incomplete coverage) repair between January 2006 and December 2012. SR repair followed the conventional protocol. For double-row TOE repairs, 4 medial sutures were inserted with 2 lateral row anchors. The patients were evaluated for cuff integrity (on magnetic resonance imaging at 6 months postoperatively) and for clinical outcome (pain on the visual analog scale and various scores assessing shoulder function; all logged preoperatively and postoperatively at 3 months, 6 months, and at the last follow-up). RESULTS: SR and TOE repairs were performed in 46% and 54% of patients, respectively. Type I and type II repairs were performed in 87% and 13% of patients, respectively. The overall incidence of retear assessed on postoperative magnetic resonance imaging was 6.74%. The incidence of retear in the SR group was statistically significantly higher only in large-sized tears (28.57% vs. 4.5%; P = .028). Among the postoperative scores at the final follow-up, only the function on the visual analog scale differed significantly between the groups (P < .01), with patients treated by TOE repair showing higher scores (8.47 ± 1.70 vs. 7.91 ± 1.66). CONCLUSION: In this large cohort study, SR and TOE repair provided similar clinical and radiologic outcomes. Nevertheless, TOE repair was associated with significantly improved healing rate for large-sized tears.

Evaluation of risk factors for irreparable rotator cuff tear in patients older than age 70 including evaluation of radiologic factors of the shoulder.

BACKGROUND: Rotator cuff tears (RCTs) are generally considered to occur at the age of 40 to 50, but some becomes massive tears at the age of 60 to 70 if neglected. This study evaluated preoperative factors affecting tear size and reparability of rotator cuffs based on magnetic resonance imaging findings among patients older than age 70. METHODS: We identified 270 patients with full-thickness RCTs (175 reparable tears, group A; 95 irreparable tears, group B) that were confirmed with magnetic resonance imaging findings from January 2009 to March 2016. Irreparable tear was identified if all of the following criteria were met: (1) a large to massive RCT based on the DeOrio and Cofield classification, (2) sum of preoperative global fatty degeneration index of the supraspinatus and infraspinatus ≥6, and (3) positive tangent sign. Preoperative variables included demographic data, medical history, and radiologic data. Acromial index, critical shoulder angle, and acromiohumeral interval (AHI) were evaluated to investigate the relationship between anatomic factors and reparability of RCT. RESULTS: Stepwise multivariated regression analysis revealed older age, longer symptom duration, longer duration of overhead sports activity, lower preoperative forward elevation of the shoulder joint, and shorter AHI as risk factors for irreparable RCTs. CONCLUSIONS: This study suggests that older age at surgery, longer duration of symptoms, longer duration of overhead sports activity, lower preoperative forward elevation of the shoulder joint, and shorter AHI are independent risk factors for irreparable RCT.

Arthroscopic subscapularis repair using single-row mattress suture technique: clinical results and structural integrity.

BACKGROUND: Rupture of the subscapularis (SSC) tendon, isolated or combined, is rare, and the treatment modalities are controversial. The purpose of this study was to evaluate, by magnetic resonance imaging (MRI), the clinical outcomes and structural integrity of the SSC tendon after all-arthroscopic repair with single-row mattress suture for isolated or combined SSC tendon tears. METHODS: This study included 68 patients who underwent all-arthroscopic repair using single-row mattress suture for isolated or combined SSC tendon tears between April 2011 and January 2013. The patients were evaluated by the visual analog scale for pain, American Shoulder and Elbow Surgeons score, Constant shoulder score, and SSC muscle strength measurement. MRI was used for assessment of the postoperative integrity of the SSC tendon. RESULTS: With a mean follow-up of 29.5 ± 4.0 months, the preoperative Constant shoulder and American Shoulder and Elbow Surgeons scores were 50.3 ± 21.0 and 46.6 ± 18.3, respectively, which improved at the last follow-up to 75.7 ± 16.6 and 81.3 ± 18.1, respectively, with statistical significance (P < .001). Belly-press and bear-hug test results showed some improvement in the last follow-up (>2 years) compared with the presurgical state (P = .125 and .650). A statistically significant SSC muscle strength deficit persisted in the postoperative state (P = .015). MRI evaluation showed a retear rate of 8.8%. CONCLUSIONS: Arthroscopic repair of isolated or combined SSC tears with the single-row mattress suture technique results in significant clinical improvements and enduring tendon integrity, although SSC strength remains reduced from that on the normal side.

Supraspinatus muscle occupation ratio predicts rotator cuff reparability.

BACKGROUND: We wished to determine the correlation between supraspinatus muscle occupation ratio and reparability of rotator cuff muscles and that of each occupation ratio with 1-muscle, 2-muscle, and 3-muscle rotator cuff injury. METHODS: We evaluated 170 patients (average age, 62.3 [40-83] years) with complete (type II) or incomplete (type III) rotator cuff repair by arthroscopy. Type II repair was defined as complete repair but less optimal coverage of the entire medial-lateral footprint. Type III repair was defined as incomplete repair; a small portion (<10 mm) of the humeral head is exposed. Patients were divided into 2 groups: 96 and 74 patients who underwent type II and type III repair, respectively. Patients were also categorized into 4 groups: isolated supraspinatus tears, supraspinatus and infraspinatus tears, supraspinatus and subscapularis tears, and tears in all 3 muscles. Supraspinatus muscle atrophy was evaluated by the occupation ratio on the most lateral T1-weighted sagittal oblique view in which the scapular spine contacted the scapular body. The supraspinatus muscle occupation ratio was measured by 2 independent observers. RESULTS: On magnetic resonance imaging, the supraspinatus muscle occupation ratio was significantly different between the completely repaired and incompletely repaired groups. The mean occupation ratio of the completely repaired group (42.39 ± 10.1) was significantly higher than that of the incompletely repaired group (36.64 ± 6.94). The cutoff value of the supraspinatus muscle occupation ratio (complete to incomplete repair) was 41. The supraspinatus muscle occupation ratio significantly decreased as the tear increased (P < .001). CONCLUSION: A supraspinatus muscle occupation ratio of <41 can be the cutoff value for greater tuberosity coverage vs. incomplete coverage. There was a significant correlation between tear pattern and supraspinatus muscle atrophy ratio. The supraspinatus tear group had the lowest degree of muscle atrophy.

Comparison of outcomes with arthroscopic repair of acute-on-chronic within 6 months and chronic rotator cuff tears.

BACKGROUND: The purpose of this study was to define preoperative and intraoperative findings of acute-on-chronic rotator cuff tears (RCTs). This study also compared the functional and clinical outcomes with acute-on-chronic RCTs and chronic RCTs. METHODS: This study was conducted between December 2007 and December 2013. An acute-on-chronic full-thickness RCT was diagnosed with preoperative and intraoperative findings on arthroscopy. The study group consisted of 36 patients with preoperative and intraoperative findings (surgery performed within 6 months of trauma) indicative of an acute-on-chronic RCT. Another 36 patients matched for age, sex, and tear size, who underwent arthroscopic rotator cuff repair after 6 months of onset of symptoms (chronic RCT group), were selected from our institution's database within the same time frame. Postoperative indirect magnetic resonance arthrogram was obtained 6 months after the repair, and rotator cuff integrity was graded according to the guidelines as described by Sugaya. Patients were evaluated using the visual analog scale for pain, American Shoulder and Elbow Surgeons Shoulder Assessment score, and Constant scores. Scores and measurements were obtained preoperatively and at 6, 12, and 24 months after surgery. RESULTS: The clinical outcomes and range of motion recovery were better in the acute-on-chronic RCT group. Although statistically not significant, the acute-on-chronic RCT group's repair appeared closer to the complete repair and was associated with a lesser incidence of retear than the chronic RCT group. CONCLUSION: Early repair of an acute-on-chronic full-thickness RCT results in a statistically and clinically superior improvement in outcomes compared with repairs of chronic RCTs.

Prospective Randomized Clinical Trial of Arthroscopic Repair Versus Debridement for Partial Subscapularis Tendon Tears More Than Half of the Entire First Facet.

BACKGROUND: Most outcome studies on subscapularis (SSC) tendon tears have focused on large SSC tears rather than partial SSC tendon tears. Therefore, the optimal treatment for partial SSC tendon tears more than half of the first facet of the entire SSC footprint has not yet been clearly defined. PURPOSE: To prospectively investigate the clinical and radiological results between the arthroscopic repair group and the debridement group in SSC partial tear (Yoo and Rhee classification, type 2B: SSC tendon tears of more than half of the entire first facet). STUDY DESIGN: Randomized controlled trial; Level of evidence, 1. METHODS: A total of 65 patients with SSC tendon type 2B tears were randomized to arthroscopic debridement (n = 33) or arthroscopic repair (n = 32). Clinical evaluation of the patients was performed on the day before surgery and 6 months, 1 year, 2 years, and 5 years postoperatively using active range of motion measurements and other validated scores (pain visual analog scale scores, function visual analog scale scores, Constant score, American Shoulder and Elbow Surgeons score). In addition, SSC muscle strength was measured using instruments in the belly-press position. Magnetic resonance imaging (upper and lower SSC muscle diameters, Goutallier grades) was performed on the day before operation as well as 6 months and 2 years postoperatively. RESULTS: There were no clinically or statistically significant differences between the arthroscopic debridement and arthroscopic repair groups with respect to active range of motion, pain visual analog scale scores, function visual analog scale scores, Constant scores, or American Shoulder and Elbow Surgeons scores. There was a statistically significant increase in SSC muscle strength in the repair group compared with the debridement group at 5 years postoperatively (P = .013). Magnetic resonance imaging assessment was also not significantly different between the 2 groups. CONCLUSION: There were no differences in the patient-reported outcomes of patients with partial SSC tears treated with either arthroscopic debridement or repair, although there was an increase in SSC muscle strength associated with repair, the clinical importance of which may warrant further research. REGISTRATION: NCT03183466 (ClinicalTrials.gov identifier).

Does the Suprascapular Nerve Move within the Suprascapular Notch? Biomechanical Perspective Using the Finite Element Method.

PURPOSE: We aimed to analyze changes in suprascapular nerve (SSN) position within the suprascapular notch during in vivo shoulder abduction. MATERIALS AND METHODS: Three-dimensional models of the shoulder complex were constructed based on magnetic resonance imaging of the brachial plexus (BP-MR) in a patient diagnosed with SSN dysfunction but normal scapular movement. Using BP-MR in neutral position and computed tomography data on shoulder abduction, shoulder abduction was simulated as the transition between two positions of the shoulder complex with overlapping of a neutral and abducted scapula. SSN movement during abduction was evaluated using the finite element method. Contact stress on the SSN was measured in the presence and absence of the transverse scapular ligament (TSL). RESULTS: In the neutral position, the SSN ran almost parallel to the front of the TSL until entering the suprascapular notch and slightly contacted the anterior-inferior border of the TSL. As shoulder abduction progressed, contact stress decreased due to gradual loss of contact with the TSL. In the TSL-free scapula, there was no contact stress on the SSN in the neutral position. Towards the end of shoulder abduction, contact stress increased again as the SSN began to contact the base of the suprascapular notch in both TSL conditions. CONCLUSION: We identified changes in the position of the SSN path within the suprascapular notch during shoulder abduction. The SSN starts in contact with the TSL and moves toward the base of the suprascapular notch with secondary contact. These findings may provide rationale for TSL release in SSN entrapment.

Glenoid Orientation and Profile in Atraumatic or Microtraumatic Posterior Shoulder Instability: Morphological Analysis Using Computed Tomography Arthrogram.

BACKGROUND: Posterior shoulder instability (PSI) is a relatively uncommon condition that occurs in about 10% of patients with shoulder instability. PSI is usually associated with dislocations due to acute trauma and multidirectional instability, but it can also occur with or without recognizable recurrent microtrauma. The infrequency of atraumatic or microtraumatic PSI and the lack of a full understanding of the pathoanatomy and the knowledge of management can lead to misdiagnosis or delayed diagnosis. PURPOSE: To evaluate the morphologic factors of the glenoid that are associated with atraumatic or microtraumatic PSI. STUDY DESIGN: Cross-sectional study; Level of evidence, 3. METHODS: Enrolled in this study were patients who underwent arthroscopic posterior labral repair between January 2013 and March 2017 and were diagnosed with posterior glenohumeral instability by means of preoperative computed tomography arthrography (CTA) (n = 39; PSI group). These patients did not have any significant dislocation or subluxation episodes. The morphologic factors of the glenoid as revealed using CTA were compared with the CTA images from a sex-matched control group (n = 117) of patients without PSI who had been diagnosed with adhesive capsulitis in an outpatient clinic. The glenoid version and shape were evaluated between the 2 groups using the CTA findings, and the degree of centricity of the humeral head to the glenoid was assessed in the PSI group. Multivariate logistic regression analysis was performed to identify factors associated with PSI. RESULTS: The results of the multivariate logistic regression analysis indicated no statistically significant difference between the PSI and control groups regarding glenoid version or a flat-shaped glenoid. However, statistically significant between-group differences were found regarding convex glenoid shape, with an odds ratio of 5.39 (95% CI, 1.31-23.35; P = .0207). The proportion of eccentricity was significantly higher in the PSI group (21/39; 54%) versus the control group (47/117; 40%) (P = .031). CONCLUSION: The presence of convex glenoid shape was significantly associated with atraumatic or microtraumatic PSI. Humeral head eccentricity accounted for a high percentage of convex glenoid shape. However, there was no significant correlation between PSI and glenoid retroversion.

Clinical Results after Arthroscopic Treatment of Septic Shoulder with Proximal Bone Involvement.

BACKGROUND: If osteomyelitis is confined to the proximal humerus, arthroscopic debridement with multiple punctures at the infected bone might be sufficient to eradicate the septic shoulder with bone involvement. MATERIALS AND METHODS: From 2005 to 2017, 15 patients received arthroscopic debridement with multiple punctures. We included patients with septic shoulder arthritis with proximal bone involvement and excluded patients with glenohumeral joint destruction or extension of bone involvement to the diaphysis of the humerus. We performed multiple punctures for drainage of proximal humerus after complete arthroscopic debridement of septic soft tissue. Infection laboratory studies and postoperative magnetic resonance image were evaluated. For clinical outcome measurements, range of motion, pain visual analog scale, functional visual analog scale, American shoulder elbow surgeon scores, constant scores, and simple shoulder test were evaluated. RESULTS: There were 11 males and 4 females with a mean age of 53 years (range 28-73 years). Mean follow-up was 32 months (range 12-115 months). There was no reinfection case. The postoperative C-reactive protein levels were normalized in all. The postoperative magnetic resonance image showed no bony involvement of the proximal humerus in all patients except one patient. The clinical scores and range of motion were significantly improved postoperatively. Six patients underwent secondary surgery for rotator cuff tear at a mean time period of 25 months (range 4-104 months) from the index period. CONCLUSION: Septic shoulder with proximal bone involvement can be successfully treated with arthroscopic debridement with multiple punctures. LEVEL OF EVIDENCE: Level IV, treatment study.

Effect of co-administration of atelocollagen and hyaluronic acid on rotator cuff healing.

BACKGROUND: This study aimed to evaluate the co-administration effect of atelocollagen combined with hyaluronic acid (HA) injections for treatment of full-thickness rotator cuff tear (RCT). METHODS: Eighty patients who underwent arthroscopic rotator cuff repair for full-thickness RCT from March 2018 to November 2019 were enrolled. The patients were randomly allocated to the following groups: combined atelocollagen and HA injection (group I, n=28), only HA injection (group II, n=26), and no injection (group III, n=26). Clinical outcomes were assessed at 3, 6, and 12 months after surgery using the American Shoulder and Elbow Surgeons score, visual analog scale pain score, functional scores (pain visual analog scale, function visual analog score), and range of motion. Magnetic resonance imaging was performed 12 months after surgery to evaluate rotator cuff integrity. RESULTS: Preoperative demographic data and postoperative clinical outcomes did not differ significantly among the three groups (p>0.05). However, in group I, the number of steroid injections after surgery was significantly lower than that in the other groups (p=0.011). The retear rate on follow-up magnetic resonance imaging was significantly higher in group II (9.5%, n=2) and group III (13.6%, n=3) than in group I (0%) (p=0.021). CONCLUSIONS: Co-administration of atelocollagen and HA improves healing of the rotator cuff and increases the integrity of the rotator cuff repair site. This study provides encouraging evidence for use of combined atelocollagen-HA injections to treat patients with full-thickness RCT.

Treatment of acute high-grade acromioclavicular joint dislocation.

Acromioclavicular (AC) joint dislocations account for about 9% of shoulder injuries. Among them, acute high-grade injury following high-energy trauma accounts for a large proportion of patients requiring surgical treatment. However, there is no gold standard procedure for operative treatment of acute high-grade AC joint injury, and several different procedures have been used for this purpose in clinical practice. This review article summarizes the most recent and relevant surgical options for acute high-grade AC joint dislocation patients and the outcomes of each treatment type.

Arthroscopic Iliac Bone Block Augmentation for Glenoid Reconstruction: Transglenoid Fixation Technique Using an All-Suture Anchor.

Arthroscopic Bankart repair of anterior instability has shown relatively good results, but its effectiveness is unclear in cases wherein there is a bone defect in the glenoid bone. The surgical management of recurrent anterior shoulder instability with severe glenoid bone loss has been challenging until now. Therefore the Latarjet procedure was introduced as an alternative that provided good results in cases of full instability with a bone defect. In cases of recurrent anterior shoulder instability, bone defects are often present within the glenoid. To restore glenohumeral stability, a bone augmentation procedure is required, and the Latarjet procedure to use bony transfer from the coracoid is the most popular technique. However, resorption of the bone graft with metal screw protrusion is a serious concern, whereas the relative contribution of the dynamic sling effect of the Latarjet procedure remains controversial. The Latarjet procedure also destroys the normal kinematics, resulting in side effects such as scapular dyskinesia. Here we introduce an arthroscopic anterior bone block procedure for reconstructing anterior glenoid bone defects using an autologous iliac crest graft. This technique enables precise bone block placement and fixation using one all-suture anchor instead of screw fixation.

Effect of Preoperative Frozen Shoulder on Clinical Outcomes After Arthroscopic Rotator Cuff Repair.

BACKGROUND: A concomitant rotator cuff tear (RCT) with frozen shoulder is a common but challenging clinical scenario. The effect of frozen shoulder on clinical outcomes is open to discussion. PURPOSE/HYPOTHESIS: This study aimed to evaluate the effect of preoperative frozen shoulder on postoperative clinical outcomes of an RCT. We hypothesized that the treatment results of an RCT concomitant with preoperative frozen shoulder would be comparable with those of an isolated RCT. STUDY DESIGN: Cohort study; Level of evidence, 3. METHODS: A total of 212 patients were divided into 2 groups: 154 in the non-frozen shoulder (NFS) group and 58 in the preoperative frozen shoulder (FS) group. All patients underwent a thorough preoperative evaluation that included range of motion (ROM) and the pain visual analog scale, functional visual analog scale, Constant score, and American Shoulder and Elbow Surgeons (ASES) score. The same evaluation was performed at 6 months and 1 and 2 years postoperatively. The healing status of the repaired RCT of all patients was evaluated by postoperative magnetic resonance imaging. RESULTS: The FS group showed statistically significantly worse functional outcomes than the NFS group at 6 months and 1 year postoperatively (P < .05). At 2 years postoperatively, active assisted ROM was equivalent between the groups, although the ASES and Constant scores were significantly lower for the FS group (P < .033 and P < .001, respectively). The retear rates were 5.3% and 12.3% for the FS and NFS groups, respectively (P = .013). CONCLUSION: Preoperative frozen shoulder positively affected rotator cuff healing but negatively affected most functional outcomes, including ROM, at 6 months and 1 year postoperatively. At 2 years after surgery, there was no significant difference in active motion, but outcome scores remained lower in the FS group. For patients with preoperative frozen shoulder, a delay in surgery for additional physical therapy might not be necessary. The retear rate for the NFS group was more than double that for the FS group in the current study, which indicates that surgery for an RCT combined with frozen shoulder might provide better results in the long term because of an intact, healed rotator cuff.

Arthroscopic Repair of Large and Massive Rotator Cuff Tears: Complete Repair with Aggressive Release Compared with Partial Repair Alone at a Minimum Follow-up of 5 Years.

BACKGROUND: The purpose of this retrospective study was to assess the clinical and radiographic outcomes of large and massive rotator tears treated with arthroscopic complete repair with a posterior interval slide compared with partial repair without a posterior interval slide at a minimum follow-up of 5 years. METHODS: This study included 58 patients with large and massive rotator cuff tears that were unable to be treated with arthroscopic complete repair with an anterior interval slide and margin convergence alone. Each patient underwent either arthroscopic complete repair with an additional posterior interval slide and a subsequent side-to-side repair of the interval slide edge (complete-repair group) or arthroscopic partial repair with margin convergence and without the additional posterior interval slide (partial-repair group). Patient assignment to treatment group was not randomized. Clinical assessments included the visual analog scale pain score, the Subjective Shoulder Value, the American Shoulder and Elbow Surgeons score, the University of California Los Angeles shoulder score, and active range of motion. Preoperative and 6-month follow-up magnetic resonance arthrography (MRA) images were compared within and between groups. RESULTS: At the time of the latest follow-up evaluation, both groups had significant improvements in clinical outcomes (p < 0.001). There were no significant differences in the clinical outcomes between groups. A retear was identified in 22 (88%) of the 25 patients in the complete-repair group and 28 (85%) of the 33 patients in the partial-repair group. Patients in the complete-repair group had larger retear sizes (p = 0.001) and reduced acromiohumeral intervals (p = 0.007) compared with those in the partial-repair group. CONCLUSIONS: Although larger retear size on early postoperative MRA led to significantly reduced acromiohumeral intervals in the complete-repair group, there were no significant differences in clinical outcomes between groups during the minimum 5-year follow-up period. Therefore, it may be preferable to perform partial rotator cuff repair rather than aggressive release in large and massive rotator cuff tears to achieve complete repair. LEVEL OF EVIDENCE: Therapeutic Level III. See Instructions for Authors for a complete description of levels of evidence.