Predicting Recurrent Instability of the Shoulder (PRIS): A Valid Tool to Predict Which Patients Will Not Have Repeat Shoulder Instability After First-Time Traumatic Anterior Dislocation

Background: Determining the amount of glenoid bone loss in patients after anterior glenohumeral instability events is critical to guiding appropriate treatment. One of the challenges in treating the shoulder instability of young athletes is the absence of clear data showing the effect of each event. Purpose: To prospectively determine the amount of bone loss associated with a single instability event in the setting of first-time and recurrent instability. Study Design: Cohort study; Level of evidence, 2. Methods: The authors conducted a prospective cohort study of 714 athletes surveilled for 4 years. Baseline assessment included a subjective history of shoulder instability. Bilateral noncontrast shoulder magnetic resonance imaging (MRI) was obtained for all participants with and without a history of previous shoulder instability. The cohort was prospectively followed during the study period, and those who sustained an anterior glenohumeral instability event were identified. Postinjury MRI with contrast was obtained and compared with the screening MRI. Glenoid width was measured for each patient’s pre- and postinjury MRI. The projected total glenoid bone loss was calculated and compared for patients with a history of shoulder instability. Results: Of the 714 athletes (1428 shoulders) who were prospectively followed during the 4-year period, 22 athletes (23 shoulders) sustained a first-time anterior instability event (5 dislocations, 18 subluxations), and 6 athletes (6 shoulders) with a history of instability sustained a recurrent anterior instability event (1 dislocation, 5 subluxations). On average, there was statistically significant glenoid bone loss (1.84 ± 1.47 mm) after a single instability event ( P < .001), equivalent to 6.8% (95% CI, 4.46%-9.04%; range, 0.71%-17.6%) of the glenoid width. After a first-time instability event, 12 shoulders (52%) demonstrated glenoid bone loss ≥5% and 4 shoulders, ≥13.5%; no shoulders had ≥20% glenoid bone loss. Preexisting glenoid bone loss among patients with a history of instability was 10.2% (95% CI, 1.96%-18.35%; range, 0.6%-21.0%). This bone loss increased to 22.8% (95% CI, 20.53%-25.15%; range, 21.2%-26.0%) after additional instability ( P = .0117). All 6 shoulders with recurrent instability had ≥20% glenoid bone loss. Conclusion: Glenoid bone loss of 6.8% was observed after a first-time anterior instability event. In the setting of recurrent instability, the total calculated glenoid bone loss was 22.8%, with a high prevalence of bony Bankart lesions (5 of 6). The findings of this study support early stabilization of young active patients after a first-time anterior glenohumeral instability event.

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Prospective Evaluation of Glenoid Bone Loss After First-Time and Recurrent Anterior Glenohumeral Instability Events

Orthopaedic Journal of Sports Medicine ◽

10.1177/2325967118s00096 ◽

2018 ◽

Vol 6 (7_suppl4) ◽

pp. 2325967118S0009 ◽

Cited By ~ 1

Author(s):

Jonathan F. Dickens ◽

Sean E. Slaven ◽

Kenneth L. Cameron ◽

Adam M. Pickett ◽

Matthew A. Posner ◽

...

Keyword(s):

Bone Loss ◽

Shoulder Instability ◽

Glenoid Bone Loss ◽

Anterior Instability ◽

Glenohumeral Instability ◽

Post Injury ◽

Recurrent Instability ◽

History Of ◽

Anterior Glenohumeral Instability ◽

First Time

Objectives: Determining the amount of glenoid bone loss in patients following anterior glenohumeral instability events is critical to guiding appropriate treatment. One of the challenges in managing shoulder instability in young athletes is the absence of clear data showing the impact of each event. The purpose of this study was to prospectively determine the amount of bone loss associated with a single instability event, in the setting of both first-time and recurrent instability. Methods: We conducted a prospective cohort study of 714 athletes followed for four years. Baseline assessment included a subjective history of shoulder instability. Bilateral shoulder MRIs were obtained in all participants with and without a history of previous shoulder instability. The cohort was prospectively followed during the study period and those who sustained an anterior glenohumeral instability event were identified. A post-injury MRI was obtained and compared to the screening MRI. Glenoid width was measured for each patient’s pre- and post-injury MRI. The projected total glenoid bone loss was calculated and compared for patients with a prior history of shoulder instability. Results: Of the 714 athletes that were prospectively followed during the four-year period, 23 shoulders in 22 subjects sustained a first-time anterior instability event (5 dislocations, 18 subluxations), and six subjects with a previous history of instability sustained a recurrent anterior instability event (1 dislocation, 5 subluxations). On average, there was statistically significant glenoid bone loss (1.84 ± 1.47 mm) following a single instability event (p<0.001), equivalent to 6.8% (95% CI: 4.46%, 9.04%, range 0.71%-17.6%) of the glenoid width. Twelve shoulders (52%) demonstrated glenoid bone loss ≥ 5%, 4 shoulders demonstrated glenoid bone loss ≥13.5% and no shoulders had ≥20% glenoid bone loss after a first-time instability event. Pre-existing glenoid bone loss in subjects with a history of instability was 10.2% (95% CI: 1.96%, 18.35%, range 0.6% - 21.0%). This bone loss increased to 22.8% (95% CI: 20.53%, 25.15%, range 21.2% to 26.0%) following an additional instability event (P=0.0117). All six shoulders with recurrent instability had >20% glenoid bone loss. Conclusion: Glenoid bone loss of 6.8% was observed after a first-time anterior instability event. In the setting of recurrent instability, the total calculated glenoid bone loss was 22.8% with a high prevalence of bony Bankart lesions (5/6). The findings of this study support early stabilization of young, active subjects following a first-time anterior glenohumeral instability event. [Figure: see text][Table: see text]

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Recurrent Instability after Arthroscopic Glenoid Labral Repair with a Minimum of Three Points of Fixation: Do the Number of Anchors or Fixation Points Correlate to Outcomes?

Surgical Technology Online ◽

10.52198/21.sti.38.os1411 ◽

2021 ◽

Author(s):

Sean Mc Millan ◽

Brian Fliegel ◽

Michael Stark ◽

Elizabeth Ford ◽

Manuel Pontes ◽

...

Keyword(s):

Shoulder Instability ◽

Statistical Significance ◽

Labral Repair ◽

Secondary Outcome ◽

Consecutive Series ◽

Recurrent Instability ◽

Significant Difference ◽

Fixation Points ◽

Definition Of ◽

Shoulder Score

Introduction: The goal of this study was to evaluate the recurrence rate of instability following arthroscopic Bankart repairs in regard to the number and types of fixation utilized. A Bankart lesion is a tear in the anteroinferior capsulolabral complex within the shoulder, occurring in association with an anterior shoulder dislocation. These injuries can result in glenoid bone loss, decreased range of motion, and recurrent shoulder instability. Successful repair of these lesions has been reported in the literature with repair constructs that have three points of fixation. However, the definition of “one point of fixation” is yet to be fully elucidated. Materials and Methods: A consecutive series of arthroscopically repaired Bankart lesions were evaluated pertaining to the points of fixation required to achieve shoulder stability. This included the number, position, and types of anchors used. Patients consented to complete a series of surveys at a minimum of two years postoperatively. The primary outcome was to determine recurrent instability via the UCLA Shoulder Score, the ROWE Shoulder Instability Score, and the Oxford Shoulder Score. A secondary outcome included pain on a Visual Analog Scale (VAS). Results: There were 116 patients reviewed, 46 patients achieved three points of fixation in their surgical repair via two anchors and 70 patients achieved a similar fixation with three or more anchors. There was no significant difference in the mean age, gender, or body mass index (BMI). Patients receiving two anchors demonstrated recurrent instability 8.7% of the time (4 of 46 patients). Patients who received three or more anchors demonstrated recurrent instability 8.6% of the time (6 of 70 patients). Overall, there was no statistical significance between the number/types of anchors used. Between the two cohorts, there was no statistically significant difference found between VAS, ROWE, UCLA, and Oxford Scores. There was a significant difference in pain reported on the VAS scale with an average VAS score of 0.43 versus 2.5 in those without and with recurrent instability respectively. Conclusion: Contention still exists surrounding the exact definition of “a point of fixation” in arthroscopic Bankart repairs. Three-point constructs can be created through a variety of combinations including anchors and sutures, ultimately achieving the goal of a stable shoulder.

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Does the innate relative size of the humeral head and glenoid affect the risk of anterior shoulder instability?

Shoulder & Elbow ◽

10.1177/1758573218805099 ◽

2018 ◽

Vol 11 (6) ◽

pp. 424-429

Author(s):

NW Willigenburg ◽

RA Bouma ◽

VAB Scholtes ◽

VPM van der Hulst ◽

DFP van Deurzen ◽

...

Keyword(s):

Shoulder Instability ◽

Humeral Head ◽

Relative Size ◽

Ct Scans ◽

Anterior Shoulder Instability ◽

Multivariate Logistic Regression ◽

Recurrent Instability ◽

Bony Lesions ◽

Joint Contact ◽

And Gender

Background Bony lesions after shoulder dislocation reduce the joint contact area and increase the risk of recurrent instability. It is unknown whether the innate relative sizes of the humeral head and glenoid may predispose patients to shoulder instability. This study evaluated whether anterior shoulder instability is associated with a larger innate humeral head/glenoid ratio (IHGR). Methods We evaluated CT scans of 40 shoulders with anterior shoulder instability and 48 controls. We measured axial humeral head diameter and glenoid diameter following native contours, discarding any bony lesions, and calculated IHGR by dividing both diameters. Multivariate logistic regression determined whether the IHGR, corrected for age and gender as potential confounders, was associated with anterior shoulder instability. Results Mean IHGR was 1.48 ± 0.23 in the group with anterior shoulder instability and 1.42 ± 0.20 in the group without anterior shoulder instability. Measurements for axial humeral head and axial glenoid diameters demonstrated excellent intra-rater reliability (ICC range: 0.94–0.95). IHGR was not significantly associated with anterior shoulder instability (OR = 1.105, 95%CI = 0.118–10.339, p = 0.930). Discussion The innate ratio of humeral head and glenoid diameters was not significantly associated with anterior shoulder instability in this retrospective sample of 88 shoulder CT scans.

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Outcomes and Return to Sport and Work After Open Bankart Repair for Recurrent Shoulder Instability: A Systematic Review

Orthopaedic Journal of Sports Medicine ◽

10.1177/23259671211026907 ◽

2021 ◽

Vol 9 (10) ◽

pp. 232596712110269

Author(s):

Khalid AlSomali ◽

Erica Kholinne ◽

Thanh Van Nguyen ◽

Chang-Ho Cho ◽

Jae-Man Kwak ◽

...

Keyword(s):

Systematic Review ◽

Shoulder Instability ◽

Return To Sport ◽

Bankart Repair ◽

Cochrane Library ◽

Anterior Shoulder Instability ◽

Functional Score ◽

High Demand ◽

Recurrent Instability ◽

Instability Rate

Background: Open Bankart repair provides surgeons and patients with an alternative solution for managing recurrent instability in young athletes with or without minimal bone loss. Despite many studies that have reported low recurrence rates and good functional outcomes after open Bankart repair, we have limited knowledge about the return to sport and work for high-demand populations. Purpose: To assess the return to sport and work for high-demand populations after open Bankart repair for recurrent anterior shoulder instability, outcomes of open Bankart repair with regard to recurrence, and development of osteoarthritic (OA) changes. Study Design: Systematic review; Level of evidence, 4. Methods: We searched PubMed, EMBASE, Cochrane Library, Scopus, and Google Scholar databases using keywords as well as Medical Subject Headings terms and Emtree using “(Open Bankart OR Bankart surgery) (NOT arthroscopy NOT revision)” for English-language studies. We conducted a systematic review in accordance with the PRISMA (Preferred Reporting Items for Systematic Reviews and Meta-Analyses) guidelines. Results: In total, 11 articles (10 with level 4 and 1 with level 3 evidence) including 563 patients (566 shoulders) were identified. The majority of patients were male (82%), the average age at the time of surgery was 27.4 years, and the mean follow-up was 11.5 years (range, 2.5-29 years). The most common functional score used was the Rowe score (95%) for the reported outcome measures, which showed good to excellent results (mean, 88.5 points). The overall recurrent instability rate, including dislocation and subluxation as a postoperative complication, was 8.5%. A total of 87% of patients were able to return to sport and work postoperatively. Overall, OA changes were reported in 33% of the patients, and the overall revision rate was 1%. Conclusion: Open Bankart repair exhibited favorable results, with a low postoperative instability rate. It is a reliable surgical procedure that allows high-demand patients to return to sport and work.

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Surgical Outcomes In The Frequency, Etiology, Direction, Severity (feds) Classification System For Shoulder Instability

Orthopaedic Journal of Sports Medicine ◽

10.1177/2325967120s00120 ◽

2020 ◽

Vol 8 (3_suppl2) ◽

pp. 2325967120S0012

Author(s):

Justin A. Magnuson ◽

Brian R. Wolf ◽

Kevin J. Cronin ◽

Cale A. Jacobs ◽

Shannon Ortiz ◽

...

Keyword(s):

Shoulder Instability ◽

Surgical Outcomes ◽

Anterior Dislocation ◽

Failure Rates ◽

Glenohumeral Instability ◽

Initial Event ◽

Common Category ◽

Patient Reported ◽

Type Of Failure

Objectives: The Frequency, Etiology, Direction, Severity (FEDS) system is a reliable and reproducible classification of glenohumeral instability. Frequency is defined as Solitary (1), Occasional (2-5), or Frequent (>5) episodes per year; etiology as Traumatic or Atraumatic; direction as Anterior, Posterior, or Inferior; and severity as a Subluxation or Dislocation. 36 total combinations are possible, named by the first letter of each variable in order. The purpose of this descriptive study was to investigate epidemiology, surgical outcomes, and failure using FEDS in patients undergoing surgery in a large multicenter cohort of prospectively enrolled patients. Methods: 1204 patients undergoing surgery were assigned to FEDS categories. Two-year follow-up at time of analysis was available for 629 patients (85.7% of those eligible based on date of surgery). Those categories consisting of at least 5% of patients were further analyzed by patient reported outcomes (PROs) and failure rates for a total of 466 patients. PROs included American Shoulder and Elbow Surgeons score (ASES), Western Ontario Shoulder Instability index (WOSI), and Single Assessment Numeric Evaluation (SANE). Failure benchmarks included rates of recurrent subluxation, dislocation, and revision surgery. Results: Sixteen categories represented at least one percent of patients. Occasional Traumatic Anterior Dislocation (OTAD) was the most common category with 16.4% of patients. Five other anterior categories (STAS, OTAS, FTAS, STAD, FTAD) and one posterior category (STPS) represented at least 5%. PROs and failure rates for anterior categories are summarized in Figure 1. PROs improved significantly for each category. A downward trend in WOSI and ASES was noted in particular with increasing frequency of the dislocation groups. The highest rates of each type of failure occurred in the occasional and frequent groups for both dislocation and subluxation. Low rates of failure occurred in STPS, with 17.9% reporting subluxation, 3.6% dislocation, and no revisions. Conclusion: While overall success was good, different FEDS categories showed varying degrees of improvement and failure rates, indicating that the system can be used to provide prognostic insight for presurgical education. Overall, outcomes for traumatic anterior instability decreased with higher initial frequency, showing worse PROs and higher failure. Frequency appeared to have the greatest effect on outcomes. Early surgical intervention may be beneficial in preventing progression to more severe FEDS categories, with higher frequency having previously been associated with both higher rates of bone loss and greater time between initial event and surgical stabilization.

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Recurrence Rates Following Arthroscopic Shoulder Stabilization are Improved Following a Criteria Based Return to Sport Testing Protocol

Orthopaedic Journal of Sports Medicine ◽

10.1177/2325967120s00381 ◽

2020 ◽

Vol 8 (7_suppl6) ◽

pp. 2325967120S0038

Author(s):

Adam Popchak ◽

Kevin Wilson ◽

Gillian Kane ◽

Albert Lin ◽

Mauricio Drummond

Keyword(s):

Shoulder Instability ◽

Return To Sport ◽

Return To Play ◽

Return To Sports ◽

Recurrence Rates ◽

Shoulder Stabilization ◽

Recurrent Instability ◽

Testing Protocol ◽

Recurrent Shoulder Instability ◽

Arthroscopic Shoulder Stabilization

Objectives: Recurrent shoulder instability after arthroscopic shoulder stabilization is a challenging complication that often manifests after return to sports. Many physicians use an arbitrary minimum of 5 months from surgery for clearance, although there is little data to support the use of temporal based criteria. Prior literature on ACL reconstruction has demonstrated overwhelming evidence for improved failure rates following return to sport after criteria based testing compared to time based clearance, but no such studies to date have evaluated the use of objective return to play testing protocols on recurrence rates following arthroscopic shoulder stabilization. We have prior presented on a return to sport criteria-based protocol that has demonstrated that a majority of athletes have residual strength and functional limitations which would preclude them from full clearance and return to play at 6 months postoperatively. The purpose of this study is to analyze the impact of a return to play criteria-based testing protocol on recurrent instability following arthroscopic shoulder stabilization. We hypothesized that patients who meet return to play criteria would have less recurrent instability compared to those who did not undergo the testing and were cleared to return based on time from surgery. Methods: Forty eight patients (group I) who underwent arthroscopic shoulder stabilization surgery from 2016 to 2018 with minimum 1 year follow up and were referred during postoperative rehabilitation for functional testing to evaluate readiness for return to sport were included in this retrospective case controlled study. These patients were compared to a control group of forty-eight historical consecutive cases (group II) who did not undergo return to sports testing and were cleared for sports after a minimum of 5 months following surgery. Patients with critical glenoid bone loss or off-track Hill-Sach’s lesions necessitating a remplissage or bone augmentation procedure were excluded from the study. ANOVA and independent t test were performed to analyze recurrence shoulder instability rates defined as dislocations or subluxation symptoms. Results: There was no difference between groups with regard to age ( p=0.64), sex (p=0.24), hand dominance (p=0.84), or participation in contact sports (p=0.66). Patients who underwent return to play criteria based testing protocol had a statistically significant difference in the rate of recurrent shoulder instability (10% vs. 31%, odds ratio=3.9, p<0.001). Conclusion: Athletes who undergo an objective return to play criteria based testing protocol have lower rates of recurrent instability following arthroscopic shoulder stabilization surgery than those cleared by time from surgery. Based on our findings, we strongly recommend the utilization of a criteria based testing protocol for return to play following arthroscopic shoulder stabilization, particularly for sports that have known higher risks of recurrence.

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Capsule function following anterior dislocation: Implications for diagnosis of shoulder instability

Journal of Orthopaedic Research® ◽

10.1002/jor.22300 ◽

2013 ◽

Vol 31 (6) ◽

pp. 962-968 ◽

Cited By ~ 6

Author(s):

Carrie A. Rainis ◽

Daniel P. Browe ◽

Patrick J. McMahon ◽

Richard E. Debski

Keyword(s):

Shoulder Instability ◽

Anterior Dislocation

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Arthroscopic Shoulder Stabilization in the High-Risk Young Athlete: Return to Sport and Second Surgery Rates

Orthopaedic Journal of Sports Medicine ◽

10.1177/2325967118s00117 ◽

2018 ◽

Vol 6 (7_suppl4) ◽

pp. 2325967118S0011

Author(s):

Frank A. Cordasco ◽

Brian Lin ◽

Daphne Ling ◽

Jacob G. Calcei

Keyword(s):

High Risk ◽

Revision Surgery ◽

Shoulder Instability ◽

Return To Sport ◽

Young Athlete ◽

High Rate ◽

Shoulder Stabilization ◽

Recurrent Instability ◽

Arthroscopic Shoulder Stabilization ◽

Second Surgery

Objectives: Shoulder instability in the young athlete has become an increasingly significant clinical problem in recent years. This high-risk population of athletes less than 25 years of age is a difficult cohort to manage because they have high failure rates with non-operative treatment and they reportedly have the lowest return to sport (RTS) rates and highest second surgery rates following arthroscopic shoulder stabilization compared to older patients. The purpose of this retrospective study is to evaluate the two-year clinical outcomes of a cohort of high-risk athletes less than or equal to 22 years of age following arthroscopic shoulder stabilization with a focus on RTS and incidence of second surgery. Methods: The primary outcomes evaluated were RTS and revision surgery following arthroscopic shoulder stabilization performed by the senior author at minimum follow-up of 24 months. Athletes were excluded if they had > 5 pre-operative episodes of instability, significant bone loss or had primary posterior instability. Demographic data was recorded including age, sex, BMI, last recorded range of motion, # episodes of recurrent instability, and revision surgery. A brief survey was completed regarding their shoulder instability history, sports prior to surgery, sports returned to following surgery, satisfaction with and level of RTS, time at which return to sports was achieved, recurrent instability, revision operations, and single assessment numeric evaluation (SANE) score. Results: A total of 67 athletes met inclusion criteria, with a mean age of 17.4 years (range, 13-22 years). There were 19 females (28%) and 48 males (72%). The mean number of instability events was 2 (range 0-5), 57% in the dominant arm and 43% in the non-dominant arm. Evaluation of RTS, demonstrated that 59 (88%) were able to RTS with 56 (84%) of those returning to the same level or higher, while 8 (12%) patients did not RTS for reasons other than recurrent instability or apprehension. Among the 59 patients who RTS, the average time to return was 7.3 months (range: 5-12 months) and baseball and football were the most common sports. There was a gender specific difference with respect to RTS and revision surgery. The male RTS rate was 94% compared to the female rate of 74%. Four of 67 (6%) patients underwent revision stabilization 11 to 36 months for recurrent instability, however all were male athletes 4/48 (8%). There were no female athletes who required revision surgery. Patient reported mean SANE score was 88 (SD, ±15). Conclusion: Shoulder instability in the young high-risk athlete is a complex problem with a relatively high rate of recurrence and revision surgery in the literature. In our case series, we found a relatively low reoperation rate (6%) with a high rate of RTS (88%), at an average time of 7.3 months. There was a gender specific difference with respect to RTS and revision surgery. The male RTS rate was 94% and revision surgery rate was 8% (4/48) while the female RTS rate was 74% and revision surgery rate was 0%. The athletes reported a return to near full function with an average SANE score of 88. We believe the improved outcomes in this cohort of high risk young athletes are related to the pre-operative selection criteria excluding those athletes with a greater number of pre-operative episodes of instability and those with significant bone loss and bipolar lesions as open stabilization and bone augmentation (Latarjet) are more predictable operations in athletes with these risk factors.

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