Type V superior labral anterior-posterior (SLAP) lesion in recurrent anterior glenohumeral instability

A new, effective method for diagnosing GLAD lesions: the chicken-wing muscle up test

PURPOSE

We aimed to develop and evaluate a new diagnostic method, the 'chicken-wing muscle up test', to improve the accuracy of diagnosis of glenolabral articular disruption (GLAD) lesions compared to currently used clinical tests for injuries to the labrum.

METHODS

Preoperative evaluations were conducted on 85 patients undergoing arthroscopic surgery at a single center between July 2021 to July 2022. The diagnostic performance of the preoperative clinical examinations (chicken-wing muscle up test, O'Brien test, crank test, and O'Driscoll test) were validated against the findings of arthroscopic examinations.

RESULTS

12 of the 85 patients in this study had arthroscopically confirmed GLAD lesions. The chicken-wing muscle up test demonstrated significantly higher sensitivity (83.33%) for GLAD lesions than the O'Brien test (33.33%), but not the crank test (50.00%) or O'Driscoll test (25.00%), and significantly higher specificity (95.89%) than the O'Brien test (75.34%), crank test (82.19%), and O'Driscoll test (71.23%). The chicken-wing muscle up test had the largest area under the receiver operating characteristic curve (AUC = 0.896, P < 0.001; O'Driscoll test AUC = 0.543, P > 0.05; crank test AUC = 0.661, P > 0.05; O'Brien test AUC = 0.481, P > 0.05), indicating significantly better diagnostic efficacy for GLAD lesions than the other three tests.

CONCLUSIONS

The chicken-wing muscle up test is a reliable diagnostic method that improves the accuracy of diagnosis of GLAD lesions.

Can the presence of SLAP-5 lesions be predicted by using the critical shoulder angle in traumatic anterior shoulder instability?

OBJECTIVE

Although SLAP-5 lesions are associated with recurrent dislocations, their causes and pathomechanisms have not been fully elucidated. This study aimed to investigate the association between SLAP-5 lesions and scapular morphology in traumatic anterior shoulder instability (ASI). We hypothesized that there may be a relationship between SLAP-5 lesions and scapular morphology in traumatic ASI patients.

MATERIALS AND METHODS

The study included 74 patients with isolated Bankart lesions and 69 with SLAP-5 lesions who underwent arthroscopic labral repair for ASI. Critical shoulder angle (CSA) was measured on the roentgenograms, while glenoid inclination (GI) and glenoid version (GV) were measured on magnetic resonance imaging (MRI) by two observers in two separate sessions blinded to each other. Both groups were compared in terms of CSA, GI, and GV.

RESULTS

The mean ages of Bankart and SLAP-5 patients were 28.4±9.1 and 27.9±7.7 (P=0.89), respectively; their mean CSA values were 33.1°±2.6° and 28.2°±2.4°, respectively (P<0.001). The ROC analysis's cut-off value was 30.5°, with 75.0% sensitivity and 76.7% specificity (AUC = 0.830). SLAP-5 lesions were more common on the dominant side than isolated Bankart lesions (P=0.021), but no difference was found between the groups in terms of GI and GV (P=0.334, P=0.081, respectively).

CONCLUSIONS

In ASI, low CSA values appeared to be related to SLAP-5 lesions, and the cut-off value of CSA for SLAP lesion formation was 30.5° with 75.0% sensitivity and 76.7% specificity. Scapula morphology may be related to the SLAP-5 lesions, and CSA can be used as an additional parameter in provocative diagnostic tests and medical imaging techniques for the detection of SLAP lesions accompanying Bankart lesions.

LEVEL OF EVIDENCE

III retrospective case-control study.

Outcomes After Open Latarjet in Patients With or Without SLAP Lesions

Background

Up to 20% of shoulders with anterior instability are associated with superior labrum anterior-posterior (SLAP) lesions, and they remain untreated after an open Latarjet procedure. SLAP lesions can be responsible for pain and feelings of instability in high-demand patients.

Purpose/Hypothesis

The aim of this study was to compare the early functional outcomes and return to sport rates in athletes after the Latarjet procedure with versus without associated SLAP lesions. It was hypothesized that untreated SLAP lesions would not influence clinical results.

Study Design

Cohort study; Level of evidence, 3.

Methods

Inclusion criteria were athletes with anterior shoulder instability treated with Latarjet procedure, a minimum follow-up of 1 year, and an available preoperative computed tomography arthrogram. We recorded patient characteristics; type of sport; bone loss; Rowe, Single Assessment Numeric Evaluation (SANE), and 11-item Disabilities of the Arm, Shoulder and Hand (QuickDASH) scores; 5-point pain and satisfaction scores; reported apprehension; and return to sport. Patients with and without a preoperative type 5 SLAP lesion on imaging were compared.

Results

Fifty patients were included (mean age, 22 ± 5 years [range, 16-36 years]; mean follow-up, 27 ± 9 months [range, 12-42 months]). Thirty-four patients practiced contact sports, including 20 rugby players. Twelve patients (24%) had a preoperative SLAP lesion. Groups with (+) and without (-) a SLAP lesion were comparable in terms of age, sex, number of instability episodes, type of sport, and glenoid and humeral bone loss. The SLAP+ group had significantly worse outcomes with a lower Rowe score (79 ± 23 vs 91 ± 15; P = .018) and painless rate (50% vs 77%; P = .04). There were no significant differences between the groups in SANE score (SLAP+ vs SLAP-: 80% vs 87%), QuickDASH score (8% vs 8%), return to sport (83% vs 91%), apprehension (79% vs 50%), and reported satisfaction. There was 1 episode of postoperative subluxation in each group.

Conclusion

Patients who underwent an open Latarjet procedure with an associated SLAP tear more frequently reported postoperative pain than those without a SLAP lesion. Patients with untreated SLAP tears had significantly lower Rowe scores, although SANE score and return to sport were not significantly different between the groups.

[Research progress on the relationship between shoulder instability and superior labrum anterior posterior lesion]

OBJECTIVE

To summarize the relationship between shoulder instability and superior labrum anterior posterior (SLAP) lesion.

METHODS

The characteristics of shoulder instability and SLAP lesion were analyzed, and the relationship between them in pathogenesis, clinical symptoms, and biomechanics was discussed by referring to relevant domestic and foreign literature.

RESULTS

Shoulder instability and SLAP lesion can occur both spontaneously and respectively. SLAP lesion destroys the superior labrum integrity and the long head of biceps tendon (LHBT) insertion, causing excessive humeral head displacement against glenoid, and leading to shoulder instability. While chronic repetitive or acute high-energy traumatic shoulder instability can in turn aggravate SLAP lesion, resulting in expansion and increased degree of the original lesion.

CONCLUSION

SLAP lesion destroys mechanisms of shoulder stability, while shoulder instability causes tears of the upper labrum and the LHBT, showing a connection between shoulder instability and SLAP lesion. However, the existing evidence can only demonstrate that shoulder instability and SLAP lesion induce and promote the development of each other, instead of a necessary and sufficient condition. Therefore, the specific causal relationship between the two remains unknown and needs to be further studied.

Type V superior labral anterior-posterior tears results in lower rates of return to play

PURPOSE

The purpose of this study was to evaluate the rate of return to play (RTP) in patients who underwent Type V superior labrum anterior-posterior (SLAP) repair compared to patients who underwent isolated Bankart repair in the setting of traumatic anterior shoulder instability.

METHODS

A retrospective review of patients who underwent arthroscopic Bankart repair and SLAP repair by a single surgeon between 2012 and 2017 was performed. Additionally, these were pair-matched in a 1:2 ratio for age, sex, sport and level of pre-operative play, with those undergoing isolated arthroscopic Bankart repair alone as a control group. RTP, level of RTP and the timing of RTP were assessed.

RESULTS

The study included a total of 96 patients, with 32 in the study group and 64 in the control group, and a mean follow-up of 59 months. Overall, there was no significant difference in the overall rate of return to play (26/32 (81.3%) vs 56/64 (87.5%), n.s), but there was a significantly higher rate of RTP at the same/higher level in the control group (14/32 (43.6%) vs 43/64 (67.2%), p = 0.0463). There was no significant difference in timing of RTP between the groups (n.s). There was no significant difference in recurrent instability (6/32 (18.8%) vs 5/64 (7.8%), n.s) but there was a significant difference in revision rates (5/32 (15.6%) vs. 2/64 (3.1%), p = 0.0392) between the Type V SLAP repair group and the control group.

CONCLUSION

Following arthroscopic repair, patients with Type V SLAP tears had a similar overall rate of RTP when compared directly to a control group of patients who underwent arthroscopic Bankart repair alone. However, those who underwent Type V SLAP repair reported significantly lower rates of RTP at the same or higher level compared to the control group.

LEVEL OF EVIDENCE

III.

Return to Play after Arthroscopic Bankart Repair Combined with Open Subpectoral Biceps Tenodesis

Purpose

To evaluate the clinical outcomes and rate of return to play (RTP) in patients who underwent arthroscopic Bankart repair and open subpectoral biceps tenodesis.

Methods

A retrospective review of patients who underwent combined arthroscopic Bankart repair and open subpectoral biceps tenodesis by a single surgeon between 2012 and 2016 was performed. RTP, the level of return, and the timing of return were assessed. Visual analog scale for pain, Rowe score, Shoulder Instability-Return to Sport after Injury score, and Subjective Shoulder Value were evaluated.

Results

The study included 14 patients, with a mean follow-up of 34.2 ± 12.1 months. Of the 14 patients, 13 (92.9%) returned to sport at a mean of 4.8 ± 1.2 months and 9 (64.3%) returned to the same or higher level of sport. At final follow-up, the mean Rowe was 80.0 ± 16.3, the mean Subjective Shoulder Value was 81.0 ± 15.1, the mean Shoulder Instability-Return to Sport after Injury was 57.3 ± 25.6, and the mean visual analog scale score was 2.6 ± 1.5. One patient had a recurrent dislocation, whereas no patients underwent a further operation on the ipsilateral shoulder.

Conclusion

Patients undergoing arthroscopic Bankart repair combined with open subpectoral biceps tenodesis had a high rate of RTP with a low rate of recurrent instability.

Level of Evidence

IV, Therapeutic Case Series.