Lesion prevalence and patient outcome comparison between primary and recurrent anterior shoulder instability.

BACKGROUND: The purpose of this study was to compare lesion prevalence and treatment outcomes in patients with primary and recurrent anterior shoulder instability. METHODS: Patients who were admitted to the institution with a diagnosis of anterior shoulder instability and who underwent arthroscopic surgery between July 2006 and February 2020 were retrospectively evaluated. Minimum follow-up duration of the patients was 24 months. The recorded data and magnetic resonance imaging (MRI) of the patients were examined. Patients aged ≥40 years, with a history of shoulder region fracture, inflammatory arthritis, a history of epilepsy, multidirectional instability, nontraumatic dislocation, and off-track lesions were excluded from the study. Shoulder lesions were documented and patient outcome evaluation was made with the Oxford Shoulder Score (OSS) and visual analog scale (VAS). RESULTS: A total of 340 patients were included in the study. The mean age of patients was 25.6 years (±6.49). The recurrent instability group had a significantly higher rate of anterior labroligamentous periosteal sleeve avulsion (ALPSA) lesions compared to the primary instability group (40.6% vs. 24.6% respectively) (P = .033). Twenty-five patients (43.9%) had superior labrum anterior and posterior (SLAP) lesions in the primary instability group and 81 patients (28.6%) had SLAP lesions in the recurrent instability group (P = .035). OSS increased for both primary (from 35 [16-44] to 46 [36-48]) (P = .001) and recurrent instability groups (from 33 [6-45] to 47 [19-48]) (P = .001). There was no significant difference between the groups regarding postoperative VAS and OSS scores (P > .05). CONCLUSIONS: Successful results were obtained in patients younger than 40 years with both primary and recurrent anterior shoulder instability after arthroscopic treatment. ALPSA lesion prevalence was higher whereas SLAP lesion prevalence was lower in patients with recurrent instability. Although the postoperative OSS was comparable between the patient groups, the failure rate was higher in the recurrent instability patients.

Trends and projections in surgical stabilization of glenohumeral instability in the United States from 2009 to 2030: rise of the Latarjet procedure and fall of open Bankart repair.

BACKGROUND: Advances in surgical techniques have improved the ability to address recurrent glenohumeral instability via arthroscopic capsulolabral repair and bone-restoring procedures such as the Latarjet procedure. Given the paucity of studies analyzing temporal trends in the surgical management of glenohumeral instability, the purpose of this study was to assess trends in the treatment of anterior, posterior, and multidirectional instability over a 10-year period and model projections to 2030. METHODS: Using the IBM Watson MarketScan national database, we identified all patients who underwent glenohumeral instability procedures from 2009 to 2018. Procedures were identified using Current Procedural Terminology codes for open Bankart, Latarjet, anterior bone block, posterior bone block, multidirectional capsular shift, and arthroscopic Bankart procedures. Sample weights provided by the database were used to calculate national estimates. US Census Bureau annual population data were used to calculate incidence. Future projections to 2030 were modeled using Poisson and linear regression. RESULTS: There were an estimated 446,072 glenohumeral instability cases from 2009 to 2018. The per capita incidence (per 100,000) remained constant, from 14.8 in 2009 to 14.5 in 2018. Arthroscopic Bankart procedures comprised the highest number of procedures throughout the study period, accounting for 89% of all procedures in 2009 and 93% in 2018. The number of open Bankart procedures decreased by 65% from 2009 to 2018, whereas the number of Latarjet procedures showed a 250% increase over the same period. Patient demographics did not change over the study period, and male patients aged 18-25 years comprised the largest demographic group undergoing anterior instability procedures. Multidirectional instability procedures exhibited the least pronounced sex differences. Future modeling from 2018 to 2030 projected a continued steady rise in arthroscopic Bankart procedures (from 40,000 to 49,000 cases/yr), rapid growth in Latarjet procedures (from 1370 to 4300 cases/yr), and continued decline in open Bankart procedures (from 1000 to 250 cases/yr). CONCLUSIONS: Arthroscopic Bankart repair continues to be the most common glenohumeral instability procedure in the United States. From 2009 to 2018, the incidence of open Bankart procedures declined whereas the incidence of Latarjet procedures markedly increased. Future projections to 2030 mirrored these findings. These data may provide an enhanced understanding of the evolution of surgical treatment of glenohumeral instability within the United States, laying the foundation for continued prospective studies into the appropriate indications and advancements in surgical techniques.

Epidemiology of Primary Shoulder Dislocations. A Cohort Study from a Large Health Maintenance Organization: 2004 to 2019.

BACKGROUND: Previous epidemiological studies on shoulder instability evaluated specific and relatively small subgroups of patients. OBJECTIVES: To determine the incidence rate of primary shoulder dislocations. METHODS: Cohort analysis of electronic health records from 2004 to 2019 was conducted in a urban district of a major health maintenance organization (HMO) in Israel. Patients presented with primary shoulder dislocation that was treated with closed reduction in any medical facility within the district. Overall incidence density rates (IDR) of primary shoulder dislocations and stabilization surgeries were determined. RESULTS: Over a period of 16 years 13,158 patients underwent closed reduction of primary shoulder dislocation. Of those, 712 shoulder stabilization surgeries were performed (5%). The IDR of primary shoulder dislocations were 124 per 100,000 person-years. The IDR of primary shoulder stabilizations were 7 per 100,000 person-years. The peak in the number of dislocations was observed in those 20-29 years old and ≥ 60 years of. In patients under 59 years old, dislocations were more common in men. In those ≥ 60 years of age, dislocations were more common in women. Most shoulder stabilization surgeries were performed on young patients. The annual mean time from the first dislocation to stabilization surgery linearly declined to 6 months in 2019. CONCLUSIONS: The IDR of primary shoulder dislocations calculated from the largest HMO in Israel were 124 per 100,000 person-years. Shoulder dislocations had bimodal age distribution. Overall, 5% of the patients (mainly young) with shoulder dislocations underwent shoulder stabilization surgery during the study period.

First-time traumatic anterior shoulder dislocation: current concepts.

The management of first-time traumatic anterior shoulder dislocations has been a topic of extensive study yet remains controversial. Development of a treatment plan requires an understanding of patient-specific considerations, including demographics, functional demands, and extent of pathology. Each of these can influence rates of recurrence and return to activity. The purpose of this review is to provide a framework for decision-making following a first-time anterior shoulder dislocation, with particular focus on the high-risk young and athletic population. A summary of surgical treatment options and their outcomes is outlined, along with future biomechanical and clinical perspectives.

Prevalence and risk factors for nerve injury following shoulder dislocation.

BACKGROUND: The glenohumeral joint dislocation can be associated with major nerve injury. The reported prevalence and risk factors for major nerve injury are variable and this injury can have a severe and life-long impact on the patient. The objectives of this study were to analyse the prevalence of major nerve injury following shoulder dislocation and examine risk factors. Management and outcomes of nerve injury were explored. METHODS: A 1 year retrospective cohort study of 243 consecutive adults who presented with a shoulder dislocation was performed. Data were collected on patient demographics, timings of investigations, treatment, follow-up, and nerve injury prevalence and management. The primary outcome measure was prevalence of nerve injury. Risk factors for this were analysed using appropriate tests with Stata SE15.1. RESULTS: Of 243 patients with shoulder dislocation, 14 (6%) had neurological deficit. Primary dislocation (p = 0.004) and older age (p = 0.02) were significantly associated with major nerve injury. Sex, time to successful reduction and force of injury were not associated with major nerve injury in this cohort. Patients with nerve injury made functional recovery to varying degrees. Recurrent shoulder dislocation was common accounting for 133/243 (55%) attendances. CONCLUSIONS: Shoulder dislocation requires careful assessment and timely management in the ED. A 6% rate of nerve injury following shoulder dislocation was at the lower border of reported rates (5-55%), and primary dislocation and older age were identified as risk factors for nerve injury. We emphasise the importance of referring patients with suspected major nerve injury to specialist services.

Epidemiology of primary shoulder dislocations requiring surgery: A cohort study from a major trauma center during 7 years.

PURPOSE: The epidemiology of shoulder instability in the general population is lacking. The aim of the current study was to determine the incidence rate of primary shoulder dislocations requiring surgical interventions in a major trauma center within a large maintenance organization. METHODS: A retrospective cohort analysis of electronic health records database from 1 January 2014 and 31 December 2020 was conducted in major rural trauma center. This study included all patients aged 10 years or older with a primary shoulder dislocation that were treated with closed reduction in the emergency room department. An overall incidence density rates (IDR) (per 100,000 person-years) of primary shoulder dislocations and stabilization surgeries were determined for the entire cohort. The data was used to evaluate the age-specific and gender-specific epidemiology. RESULTS: During the study period of 7 years there were 1,302 patients who underwent closed reduction after a primary shoulder dislocation (mean age 45 years). Of those, a total of 106 shoulder stabilization surgeries (8%) were performed. The IDR of primary shoulder dislocations was 179 per 100,000 person-years. The IDR of primary shoulder stabilizations was 15 per 100,000 person-years. The peak in number of dislocations was observed in the age groups of 20-29 years and over 60 years. In the age groups under 59 years dislocations were more common in men while in ages over 60 years dislocations were more common in women. The vast majority of shoulder stabilization surgeries were performed in young patients (age under 39 years). CONCLUSION: The IDR of primary shoulder dislocations calculated from a major trauma center of the largest health maintenance organization in Israel was 179 per 100,000 person-years. Shoulder dislocations had bimodal age distribution. Overall, eight percent of the patients (mainly young) with shoulder dislocations underwent shoulder stabilization surgery during the study period.

Characterization of Shoulder Instability in Rhode Island: Incidence, Surgical Stabilization, and Recurrence.

PURPOSE: To characterize shoulder instability within the state of Rhode Island from 2011 to 2019. METHODS: The Rhode Island All-Payer Claims Database (APCD) was used to identify all patients that make an insurance claim related to a shoulder instability event. All patients in the APCD with an ICD-9 code of 718.31, 718.32, or 831.00 through 831.19 or an ICD-10 code of S43.001 through S43.086 or M24.41 through M25.319 between January 1, 2011 and December 31, 2019 were selected. Chi-square analysis was used to compare age- and sex-delimited subgroups; multivariate logistic regression was used to assess for factors influencing rates of surgical intervention and recurrent instability; and Kaplan-Meier failure and log-rank analyses was used to analyze variation in the time to surgery and recurrence between age-delimited subgroups. RESULTS: The incidence of overall shoulder instability (subluxations and dislocations) in Rhode Island was 62.20 instability events (95% CI, 60.61-63.78) per 100,000 person-years. The incidence of dislocations and subluxations were 49.46 injuries (95% CI, 48.05-50.88) and 12.73 injuries (95% CI, 12.02-13.45) per 100,000 person-years, respectively. Bivariate analysis demonstrated that male patients had significantly increased rates of surgical stabilization (6.36% vs. 2.80%) and recurrent instability (16.30% vs. 9.85%) compared to their female counterparts. However, after controlling for age at the primary instability event and the type and directionality of the instability, the difference in recurrence rates between males and females is no longer statistically significant (p = 0.326). Contrary to sex, age maintained its significance with those patients aged 20 and younger and 21-40 years at significantly increased odds of surgical stabilization (3.12 and 1.99, respectively) and experiencing a recurrent instability event (3.96 and 2.77, respectively). CONCLUSION: These data characterize the epidemiology of shoulder instability within the state of Rhode Island and demonstrate how increasing age at a primary instability event decreases the likelihood of both surgical stabilization and rates of recurrence.

Factors Associated With Shoulder Activity Level at Time of Surgery and at 2-Year Follow-up in Patients Undergoing Shoulder Stabilization Surgery.

BACKGROUND: Patients undergoing shoulder stabilization surgery have been shown to have elevated activity levels. Factors associated with shoulder activity in this patient population at baseline and after surgery are unknown. HYPOTHESIS: Patient-specific variables are associated with shoulder activity level at baseline and at 2-year follow-up in a cohort of patients undergoing shoulder stabilization surgery. STUDY DESIGN: Cohort study; Level of evidence, 2. METHODS: Patients undergoing shoulder stabilization surgery were prospectively enrolled. As part of the data collection process, patients completed a previously validated Shoulder Activity Scale. A regression analysis was performed to assess the association of patient characteristics with baseline and 2-year follow-up shoulder activity levels. RESULTS: A total of 764 (n = 612 men, n = 152 women) out of 957 patients (80%) undergoing shoulder stabilization surgery with a median age of 25 years had baseline and 2-year follow-up data and were included in the current analysis. The baseline shoulder activity level was associated with race ( P < .0001) and preoperative duration of instability (P < .0001). At 2 years, 52% of the cohort had returned to the same or higher activity level after surgery. Predictors of higher shoulder activity level at 2-year follow-up included higher baseline activity level (P < .0001), male sex (P < .0001), younger age (P = .004), higher body mass index (BMI) (P = .03), more dislocations (P = .03), nonsmokers (P = .04), and race (P = .04). CONCLUSION: A longer duration of preoperative symptoms was associated with a lower baseline activity in this cohort. High baseline preoperative shoulder activity, younger age, male sex, higher BMI, number of dislocations, and nonsmoking status predicted higher shoulder activity 2 years after shoulder stabilization surgery. REGISTRATION: NCT02075775 (ClinicalTrials.gov identifier).

Recurrence in traumatic anterior shoulder dislocations increases the prevalence of Hill-Sachs and Bankart lesions: a systematic review and meta-analysis.

PURPOSE: The extent of shoulder instability and the indication for surgery may be determined by the prevalence or size of associated lesions. However, a varying prevalence is reported and the actual values are therefore unclear. In addition, it is unclear whether these lesions are present after the first dislocation and whether or not these lesions increase in size after recurrence. The aim of this systematic review was (1) to determine the prevalence of lesions associated with traumatic anterior shoulder dislocations, (2) to determine if the prevalence is higher following recurrent dislocations compared to first-time dislocations and (3) to determine if the prevalence is higher following complete dislocations compared to subluxations. METHODS: PubMed, EMBASE, Cochrane and Web of Science were searched. Studies examining shoulders after traumatic anterior dislocations during arthroscopy or with MRI/MRA or CT published after 1999 were included. A total of 22 studies (1920 shoulders) were included. RESULTS: The proportion of Hill-Sachs and Bankart lesions was higher in recurrent dislocations (85%; 66%) compared to first-time dislocations (71%; 59%) and this was statistically significant (P < 0.01; P = 0.05). No significant difference between recurrent and first-time dislocations was observed for SLAP lesions, rotator-cuff tears, bony Bankart lesions, HAGL lesions and ALPSA lesions. The proportion of Hill-Sachs lesions was significantly higher in complete dislocations (82%) compared to subluxations (54%; P < 0.01). CONCLUSION: Higher proportions of Hill-Sachs and Bankart were observed in recurrent dislocations compared to first-time dislocations. No difference was observed for bony Bankart, HAGL, SLAP, rotator-cuff tear and ALPSA. Especially when a Hill-Sachs or Bankart is present after first-time dislocation, early surgical stabilization may need to be considered as other lesions may not be expected after recurrence and to limit lesion growth. However, results should be interpreted with caution due to substantial heterogeneity and large variance. LEVEL OF EVIDENCE: IV.

Outcomes of the arthroscopic Bankart procedure in Irish collision sport athletes.

BACKGROUND: While there is an abundance of research examining the outcomes of the arthroscopic Bankart repair in collision athletes, very few studies have involved the unique Irish collision sport athlete population. The previously held belief that collision athletes need to be treated with open surgery, due to the high traumatic forces the shoulder is subjected to in these sports, may no longer be true in the context of modern arthroscopic techniques and implants. AIMS: To report the outcomes of the arthroscopic Bankart procedure in the unique Irish collision athlete population. METHOD: Retrospective review conducted in 2018. Data was obtained from collision sport athletes using customised questionnaires and validated, standardised outcome measure tools. Participants were selected using inclusion and exclusion criteria. RESULTS: Fifty-four patients were included in the study. The average age at primary injury was 19.9 years (range 13-35 years). The rate of recurrent dislocation was 21% (12/57) with a mean follow up time of 24 months (range 7 to 48 months). The mean patient reported outcome measure (PROM) scores were as follows: ASES = 90.8, WOSI = 316.4, SSV = 79%. Six patients failed to return to their sport. Eighty-seven percent of the cohort returned to their sport, with a mean time to return of 7.25 months. Patients who experienced recurrent instability after arthroscopic Bankart had a younger age at primary dislocation (P = 0.0005) and lower ASES (P = 0.0056) and WOSI scores (0.00132) at latest follow-up, compared to those who remained stable postsurgery. CONCLUSION: The arthroscopic Bankart procedure has a high rate of recurrence of dislocation in Irish collision sport athletes. The current international literature suggests that the arthroscopic Bankart has similar rates of recurrence to the open procedure in collision athletes; however, this may not hold true for Irish collision sport athletes. Further research is required to determine the optimum surgical procedure for anterior shoulder instability in this population, particularly those patients with subcritical bone loss.

Incidence of Re-Dislocation/Instability After Arthroscopic Bankart Repair: Analysis via Telephone Interviews.

INTRODUCTION: Current advances in arthroscopic surgery have led to good outcomes for arthroscopic Bankart repair (ABR) for recurrent anterior shoulder dislocation. However, recent studies have reported recurrence rates of 4%-19% after ABR. In our survey conducted from February 2002 to December 2010, the post-ABR re-dislocation rate was 8.8%. In 2011, we began performing the ABR with open Bristow (B) procedure or Remplissage (R) procedure in patients with large glenoid or humeral head bone defects and in patients who play collision sports. Therefore, the present study is the second series evaluating the incidence of re-dislocation and instability after recurrent anterior shoulder dislocation. METHOD: Surgery was performed for 84 cases of shoulder instability from January 2011 to August 2017. After excluding 7 open surgeries, 6 reoperations, and 2 patients with multidirectional instability, telephone interviews were conducted with 69 patients. The average follow-up duration was 46.9 months (range, 13-92 months). RESULT: ABR alone was performed 61 patients; the B procedure was added for 3 patients, and the R procedure was added for 5 patients. Telephone interviews were conducted with 61 patients. There were no cases of re-dislocation or reoperation. Four patients who underwent only ABR experienced postoperative instability, but not to the extent that their daily lives were affected. CONCLUSION: This study showed that the addition of R or B technique to ABR for recurrent anterior shoulder dislocation resulted in a 0% re-dislocation rate.

Latarjet After Failed Arthroscopic Bankart Repair Results in Twice the Rate of Recurrent Instability Compared With Primary Latarjet.

PURPOSE: To assess recurrent instability of the shoulder following open Latarjet performed as the primary stabilization procedure or as a salvage procedure. METHODS: A retrospective, comparative cohort study was performed for a consecutive series of patients in the Military Health System who underwent open Latarjet from January 1, 2010, to December 31, 2018. All patients were diagnosed with recurrent anterior shoulder instability and had a minimum of 2 years of postoperative follow-up. Patients were categorized as either having a primary Latarjet (PL; no prior shoulder stabilization procedure) or salvage Latarjet (SL; ≥1 previous arthroscopic surgical stabilization procedures). RESULTS: A total of 234 Latarjet procedures were performed in 234 patients. The overall recurrent instability rate was 15.8% (37/234), the overall reoperation rate was 16.7% (36/234), and the overall complication rate was 14.2% (33/234) over a mean 5.0 years of follow-up. There were 99 PL procedures and 135 SL procedures. The SL group had significantly more recurrent instability than the PL group (SL 28/135, 20.7%; PL 9/99, 9.1%; P = .0158). There was no difference in overall reoperation rates (SL 26/135, 19.3%; PL 13/99, 13.1%; P = .2140) or complication rates (SL 20/135, 14.8%; PL 13/99, 13.3%; P = .9101). CONCLUSION: The rate of recurrent instability following the Latarjet procedure in an active, high-risk population is 15.8%. Primary Latarjet was found to have lower rates of recurrence compared with salvage Latarjet procedures (9.1% versus 20.7%). LEVEL OF EVIDENCE: III.

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?

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.

Epidemiology of shoulder instability in Italy: A 14-years nationwide registry study.

INTRODUCTION: The aim of this study is to estimate the annual number of shoulder dislocation hospitalizations in Italy from 2001 to 2014, to explore geographical variation in access to hospitalizations between the 3 macro-regions of Italy (North, Centre and South) and to perform statistical projections of hospitalizations volumes and rates based on data from 2001 to 2014. MATERIALS AND METHODS: Data of the Italian Ministry of Health regarding the National Hospital Discharge records (SDO) were analysed for the period of the survey (2001-2014). These data are anonymous and include the patient's age, sex, domicile, region of hospitalization, length of the hospitalization, and type of reimbursement (public or private). RESULTS: During the 14-year study period, 92,784 hospitalizations to treat shoulder dislocation were performed in Italy, which represented an incidence of 11.2 hospitalizations for every 100,000 Italian inhabitants. 56,514 patients underwent hospitalization for non-surgical treatment. 36,270 patients underwent hospitalization for surgical treatment. The higher hospitalizations rate was among males from 15 to 64 years of age. CONCLUSIONS: Increasing rates of surgical hospitalization and decreasing rates of hospitalization for non-surgical treatment of shoulder dislocation are observed over a 14-year period. This study confirms that the socioeconomic burden of shoulder dislocation surgery heavily affects the working population. Most shoulder instability procedures were performed on males. The present study provides a description of the frequency and national distribution of shoulder instability in Italy. This study shows an increase in surgical procedures for shoulder instability in Italy.

Management of Shoulder Instability in 2020: What, When, and How.

Anterior glenohumeral instability remains a common clinical problem in the athletic and working patient populations, and further, recurrence rates following stabilization surgery continue to be problematic. Over the past 5 years, there have been substantial improvements in the understanding of anterior shoulder instability. To better counsel and treat patients, it is imperative for surgeons to have a comprehensive understanding of the epidemiology of shoulder instability, the anatomy of the glenohumeral joint particularly as it relates to glenoid and humeral head bone loss, surgical indications, and surgical techniques. These critical topics are summarized in an effort to provide a complete guide to managing anterior shoulder instability in 2020.

[Incidence, Morphology and Clinical Significance of Hill-Sachs Lesions in Shoulder Instability - CT Scan Evaluation of the Group of Patients]. / Incidence, morfologie a klinický význam HillovýchSachsových lézí u nestabilních ramenních kloubu ­ CT hodnocení souboru pacientu.

PURPOSE OF THE STUDY Shoulder instability is often times accompanied by associated injuries caused by the humeral head displacement. These are primarily bone lesions on the head and socket of the glenohumeral joint. The purpose of this study was to evaluate the frequency, morphology and clinical significance of bone lesions in shoulder instabilities in a group of patients operated in our department for glenohumeral instability between 2012 and 2019. MATERIAL AND METHODS The ongoing evaluation included 373 patients with trauma and habitual instability who had undergone surgery in our department in the period from 2012 to 2019. All patients underwent a preoperative 3D CT scan of the shoulder joint. Subsequently, the morphology and clinical significance of individual bone lesions were evaluated based on the older Burkhart s concept of engaging/nonengaging lesions and the newer concept of glenoid track by Yamamoto and Di Giacomo of 2007, 2014 or 2020. RESULTS The frequency of Hill-Sachs lesion was 83.4% (311) in our group of patients. In nearly two thirds (211 cases) also a bone defect on glenoid was detected (59.3%). When comparing the basic types of instabilities, in the TUBS group the Hill-Sachs lesions were present up to twice as often as in the group with AMBRI instability. Clinically significant Hill-Sachs lesions according to the older concept of engaging/ nonengaging lesions of Burkhart were reported in 104 cases (34%). Clinically significant lesions according to the newer concept of Yamamoto and DiGiacomo (the so-called off-track lesions) were observed in 173 cases (55.6%). Classified as critical were the clinically insignificant lesions (the so-called on-track lesions), which by their location were near the glenoid track. These lesions were found in 80 patients. After adding up the significant (off-track) and critical on-track lesions, we arrived at 253 (81.4%) clinically significant lesions based on the updated Yamamoto concept. DISCUSSION The frequency of Hill-Sachs lesions and glenoid defects identified by us is close to the upper limit of the range described in literature (8 to 100%). Based on the recent study by Yamamoto, added to these defects were the so-called peripheral ontrack defects, the clinical significance of which is currently indisputable. The oldest classification into engaging/nonengaging lesions revealed only 34% of the significant lesions, but this concept does not evaluate the glenoid defect. The newer concept by Yamamoto/DiGiacomo resulted in detecting 55.6% of significant Hill-Sachs lesions. The latest modification of the glenoid track of 2020, which includes also the on-track lesions in the critical zone among the significant lesions, in our group of patients classified 81% of lesions as clinically significant. CONCLUSIONS Our study confirmed the very frequent occurrence of clinically significant Hill-Sachs lesions in shoulder instabilities. Therefore, for the sake of successful shoulder stabilisation surgery detailed preoperative planning with 3D CT of the shoulder joint and evaluation of the associated bone lesions are necessary. The highest detection of clinically significant lesions was achieved by the latest modification of the glenoid track concept. Future studies will have to prove the effect of this classification on the result of surgical treatment. Key words: shoulder instability, glenoid track; bone defects, Hill-Sachs lesion; bipolar lesions; 3D CT evaluation.

Functional outcomes of modified Bristow procedure in recurrent shoulder dislocation.

The glenohumeral joint is the most mobile in humans. Of all the joints 50% of dislocations involve the shoulder, mostly young males. When the first dislocation occurs in a patient under 20 years age the risk for recurrent instability increases to 90%. Many techniques are available to reduce and stabilise the glenohumeral joint; in cases of anterior dislocations one of which is the famous Bristow's procedure, originally described in 1954 by Laterjet. The purpose of this study is was to determine the Functional Outcomes of the modified Bristow procedure. This retrospective review was conducted at Aga Khan University Hospital, Karachi from January 2000- December 2015, comprising patients who underwent the modified Bristow procedure. All patients recruited in the study underwent modified Bristow procedure. A total of 70 patients were included, which comprised of 61(87.1%) males and 9(12.9%) females with a mean age of 31.6±11.0 years The maximum number of shoulder dislocations occurred primarily due to road traffic accidents in 48 (68.57%) patients while the second highest cause in 13 (18.57) patients was due to playing sports. The mean number of dislocations before surgery were 3.50±0.5 whereas no patient had an episode of dislocation in the post-operative period. Two patients presented with subluxations but none required further surgical intervention. The Modified Bristow-Latarjet procedure is considered an effective surgical treatment for the recurrent glenohumeral instability of the joint.

The Incidence of Posterior and Combined AP Shoulder Instability Treatment with Surgical Stabilization Is Higher in an Active Military Population than in the General Population: Findings from the US Naval Academy.

BACKGROUND: Anterior instability has consistently been shown to be the most common type of glenohumeral instability. Recent studies have demonstrated a higher percentage of posterior and combined (anterior and posterior) instability than had previously been reported; however, this work has not been replicated recently in a particularly young military population, which may be representative of an especially athletic or high-demand group. QUESTION/PURPOSE: What proportion of arthroscopic shoulder stabilization procedures are performed to address isolated anterior instability, isolated posterior instability, and combined instability in a young, military population? METHODS: Between August 2009 and January 2020, two sports medicine fellowship-trained surgeons performed arthroscopic shoulder surgery on 543 patients at a single institution. During that time, the indication to be treated with arthroscopic stabilization surgery was symptomatic glenohumeral instability, as diagnosed by the operative surgeon, that restricted patients from carrying out their military duties. Of those, 82% (443 of 543) could be evaluated in this retrospective study, while 18% (100 of 543) were excluded due to either incomplete data or because the procedure performed was not to address instability. No patient underwent an open stabilization procedure during this period. Of the 443 patients investigated, the mean age was 22 ± 4 years, and 88% (392 of 443 patients) were men. Instability type was characterized as isolated anterior, isolated posterior, or combined (anterior and posterior) according to the physician's diagnosis as listed in the patient's clinical records and operative reports after the particular capsulolabral pathology was identified and addressed. RESULTS: Isolated anterior instability occurred in 47% of patients (210 of 443). Isolated posterior instability happened in 18% of patients (80 of 443), while combined anteroposterior instability occurred in 35% of patients (153 of 443). CONCLUSION: Shoulder instability is common in the military population. Although anterior instability occurred most frequently, these findings demonstrate higher proportions of posterior and combined instability than have been previously reported. Surgeons should have a heightened suspicion for posterior and combined anteroposterior labral pathology when performing arthroscopic stabilization procedures to ensure that these instability patterns are recognized and treated appropriately. The current investigation examines a unique cohort of young and active individuals who are at particularly high risk for instability and whose findings may represent a good surrogate for other active populations that a surgeon may encounter.Level of Evidence Level III; therapeutic study.

Posterior bony Bankart bridge technique results in reliable clinical 2-year outcomes and high return to sports rate for the treatment of posterior bony Bankart lesions.

PURPOSE: To introduce the arthroscopic "posterior bony Bankart bridge" repair technique, and to report clinical outcomes, patient satisfaction, recurrent instability rate, and return to sport rate. METHODS: Patients who were treated for posterior bony Bankart lesions with posterior bony Bankart bridge technique and were at least 2 years out from surgery were included. Clinical outcomes were assessed prospectively by the use of the American Shoulder and Elbow Surgeons (ASES) Score, Single Assessment Numerical Evaluation (SANE) Score, Quick Disabilities of the Arm, Shoulder and Hand (DASH) Score and patient satisfaction. Return to sports rate and complications were reported. RESULTS: Seven patients with a median age of 23.5 (range 17-43) and a median follow-up of 8 years (range 3-10) were included. Median time from injury to surgery was 15 days (range 3 days-2.2 years). Mean glenoid bone defect was 19% (range 11-31%). At final follow-up the median postoperative outcome scores were: ASES score 100 (range 92-100), SANE score 99 points (range 94-99) and QuickDASH 2.2 points (range 0-9). Median satisfaction of all patients was 10/10 (range 9-10). One patient reported subjective recurrent subluxations, which resolved under physical therapy. No patient underwent further surgery. No complications were noticed. At final follow-up, all patients (100%) reported that their sports participation levels were equal to their pre-injury levels. CONCLUSION: The arthroscopic posterior bony Bankart bridge technique leads to reliable postoperative shoulder function and restores shoulder stability with high patient satisfaction and low complication rate in this small patient cohort for the treatment of posterior bony Bankart lesions. Also, no recurrent dislocation was observed at a minimum follow-up of at least 3 years, one patient continued to complain of subjective subluxations which resolved under physical therapy. All patients were able to return to their pre-injury sports level. LEVEL OF EVIDENCE: Case series, Level IV.