Long-term outcomes of the Bankart and Latarjet repairs: a systematic review

Introduction

The shoulder joint has the largest range of motion of all joints with little inherent bony stability. As such, it is one of the most frequently dislocated joints in the body with an incidence of up to 47 per 100,000 person years.¹ Anterior glenohumeral dislocation commonly results in a number of pathologic lesions, including traumatic detachment of the anteroinferior capsulolabral complex from the glenoid rim (Bankart lesion²), stretching of the anterior capsule and ligamentous structures and damage to the bony glenoid or humeral head. Non-operative management has been associated with acceptable results, but recurrent dislocation can be as high as 90% in some patient populations.³ Multiple surgical procedures have been described to improve shoulder stability, each with a large number of technical variations, which in part has paralleled the advancement of surgical technology.

The Bankart repair² focuses on the anatomical re-attachment of the labrum to the glenoid rim and has been described initially utilizing an open technique and more recently incorporating arthroscopic techniques as well. While initial rates of recurrent instability were high with arthroscopic trans-glenoid suture or tack repairs, success has dramatically improved with the addition of modern suture anchors.⁴ However, rates of recurrent instability remain as high as 10–22.5%^5,6 in some case series. Recurrent instability is particularly prevalent in the young patients as well as patients with significant bone loss.^7,8

The Latarjet procedure can improve anterior stability by multiple mechanisms. Not only can the Bankart lesion be repaired and provide stability, but the transfer of the coracoid process extends the bony articular arc of the glenoid, and the addition of the conjoint tendon may provide dynamic stability as well.⁹ This procedure addresses the issue of glenoid bone loss that has recently been identified as a key factor in recurrent instability^10,11 and has been shown to be superior to Bankart repairs in biomechanical studies.¹² Multiple authors have described excellent clinical outcomes and stability rates following Latarjet reconstruction. However, the Latarjet results in significant distortion in normal anatomy and may be associated with a significant restriction in post-operative range of motion,^13–15 a result that has been linked with high rates of osteoarthritis.^16,17 Though focus is often directed toward coracoid transfer procedures, recent studies have shown that Bankart-type procedures may also result in restricted range of motion and a potentially increased risk for arthritis as well.¹⁸

Although numerous publications exist on the success of each technique, there are very few comparative trials evaluating these techniques, and very little evidence exists to examine the long-term outcomes of either procedure. Therefore, the purpose of this study was to compare the long-term clinical and radiographic outcomes of the arthroscopic Bankart, open Bankart and Latarjet repairs.

Methods

This review of literature was performed using the Preferred Reporting Items for Systemic Reviews and Meta-Analyses (PRISMA) guidelines and checklist (Figure 1). Two independent investigators conducted the search strategy involving PubMed, MEDLINE, Embase and Cochrane databases. Search terms included (“shoulder” OR “glenohumeral joint”) AND (“dislocation” OR “subluxation” OR “instability”) AND (“treatment” OR “surgery”). Inclusion criteria were 1) anterior glenohumeral instability, 2) English-language studies, 3) Bankart procedures using anchor-based or trans-osseous fixation (whether arthroscopic or open) and/or Latarjet procedures and 4) studies with a minimum of 5-year follow-up. Bankart procedures were defined as re-attachment of the anteroinferior labrum and capsule to the bony glenoid through anchors or trans-osseous fixation. Latarjet procedures were defined as those involving bony reconstruction of the anterior glenoid through transfer of the coracoid. Studies were excluded if they involved
1) Caspari’s trans-glenoid fixation or tack-based fixation, 2) acute glenoid fractures, 3) posterior or multi-direction instability and 4) revision procedures. Studies were evaluated using the levels of evidence as outlined by the Oxford Centre for Evidence-Based Medicine. Two independent investigators conducted the title, abstract and article review independently. In the event there was disagreement regarding the inclusion of a study, a third investigator, the senior author, made the final decision. The final literature search was conducted on June 30, 2015. All references were cross-referenced to avoid omitting relevant studies. For studies using duplicate patient populations, only the most recent publication was used for analysis. The Coleman methodology score (CMS)¹⁹ was used to assess the quality of the studies.

Figure 1 Systemic review algorithm using PRISMA guidelines. Abbreviation: PRISMA, Preferred Reporting Items for Systemic Reviews and Meta-Analyses.

The primary outcome is recurrent dislocation or instability symptoms. Instability symptoms included a broad clinical presentation, including subluxations, persistent apprehension, subjective sense of instability and recurrent dislocation events. Secondary outcomes include Rowe score,²⁰ radiographic osteoarthritis and complication rate. Radiographic osteoarthritis was defined using the Samilson–Prieto classification,²¹ as this was the most commonly reported classification system. Grade one was considered mild, grade two as moderate and grade three as severe. One study did not formally employ the Samilson–Prieto classification but used similar gradations with mild, moderate and severe distinctions. For the purpose of this study, complications included general surgical complications (i.e., infection, neurologic injury) and procedure-specific complications (i.e., graft osteolysis, anchor-related complications). However, recurrent instability was not included as a complication as this was separately analyzed.

Analysis was a random-effects model using binomial within-study variance for all the outcome measures, except for the Rowe score, where a fixed-effects model weighted by sample size was applied. The group comparison outcomes were estimated via least squares mean values and compared between groups with a Bonferroni adjustment for multiple comparisons. Estimated mean scores or rates are listed under least squares mean values, while differences between groups on those are listed under least squares mean values for effect group.

Results

A total of 4142 articles were identified by the literature search and reference review, and 2416 remained after removal of duplicates. Title review was completed to exclude foreign language papers, animal or biomechanical data, imaging studies and papers on unrelated topics. A total of 147 articles remained for abstract review and assessment of inclusion criteria (Figure 1). The most common reason for exclusion at this level was inadequate follow-up, inadequate report of outcomes and use of alternative fixation types. In total, 28 studies were selected for inclusion (Table 1): 6 arthroscopic Bankart, 12 open Bankart and 11 open Latarjet with a total of 1652 patients. The majority of studies were case series with level IV evidence. There was a single level III study. A total of 1652 patients were analyzed with a mean age of 26.8 years and an overall mean follow-up of 160 months.

Table 1 Summary of included studies

Least squares mean values and 95% confidence intervals for each outcome are listed in Table 2.

Table 2 Outcome analysis: least squares mean values with 95% confidence intervals Notes: aStatistically significant difference (p<0.05). bStatistically significant difference (p<0.05).

Six studies^5,22–26 reported the results of 336 arthroscopic Bankart repairs. The mean Coleman score was 71.7. The average age of included patients was 29.4 years (16–62 years) with a mean follow-up of 156 months (60–206 months).The dislocation rate was 15.1% with 20.2% of patients reporting subjective instability post-operatively. Four studies reported Rowe scores with an average of 85.5. Post-operative radiographic arthritis was documented in three studies for an overall rate of 45.9%. No complications were reported in any of the studies.

Twelve studies^{6,14,18,27–35} investigated open Bankart repairs, for a total of 632 repairs. The mean Coleman score was 64.1. The average age of included patients was 24.8 years (14–55 years) with a mean follow-up of 182 months
(60–492 months). The re-dislocation rate at 5 years was 7.7% with 20.8% of patients reporting subjective instability. Rowe scores were reported in nine studies with a mean score of 87.1. Radiographic arthritis was documented in seven studies for an overall rate of 44.1%. A complication rate of 4.3% was recorded across nine studies.

Eleven studies^{13,15,32,36–43} reported the results of open Latarjet procedures for a total of 684 repairs. The mean Coleman score was 63.3. The average age of patients was 26.8 years (15–58 years) with a mean follow-up period of 212 months (60–420 months). The re-dislocation rate was 2.7% with 14.8% of patients complaining of subjective instability symptoms. Seven studies reported Rowe scores for an average score of 87.9. Radiographic arthritis was documented in 42.0% of patients in the nine studies that included this metric. Eleven studies reported complications, with an overall rate of 10.6%.

There was a statistically significant reduction in re-dislocation comparing open Latarjet with arthroscopic Bankart (p<0.001). However, there was no difference comparing arthroscopic Bankart to open Bankart or open Bankart to Latarjet procedures. There was no statistically significant difference between groups in rates of subjective instability or development of radiographic arthritis. Open Latarjet procedures had statistically significantly more complications compared to the arthroscopic Bankart (p=0.002). Complications reported included superficial infection, superficial vein thrombosis, musculocutaneous neuropraxia, graft non-union, graft mal-union graft migration and intra-articular hardware.

Discussion

The primary goal of any stabilization procedure is to prevent recurrence of instability with the goal of improving function and to reduce long-term sequelae. In this review, the arthroscopic Bankart procedure had the highest absolute re-dislocation rate. Overall, there was a trend toward increasing stability with increasing invasiveness, although the only statistically significant result was between the arthroscopic Bankart and the open Latarjet. As the newest procedure of the three with the smallest patient cohort, the high re-dislocation rate may be partially related to a learning curve effect. The arthroscopic Bankart procedure has many technical variants that are known to influence outcomes, including beach chair versus lateral positioning,⁴⁴ portal placement,⁴⁵ fixation type⁴ and placement and morphology of the labral repair.⁴⁶ As such, it may be reasonable to expect that outcomes of the arthroscopic Bankart repair will improve as the optimal technique and indications are determined.

The open Bankart is conceptually a similar procedure to the arthroscopic Bankart with respect to the anatomic repair of the capsulolabral lesion. Interestingly, there was no significant difference noted comparing the arthroscopic Bankart to the open Bankart procedure. This could be interpreted in several ways. The first is that this supports the conclusion that the arthroscopic Bankart will continue to improve as techniques are developed to ensure proper repair characteristics. This is supported by Petrera et al⁴⁷ who directly compared open vs arthroscopic Bankart repairs in studies utilizing similar repair configurations and found improved stability with arthroscopic surgery. However, there have also been several large meta-analyses comparing high-quality trials,^48,49 which conclude that there is a consistently higher risk of re-dislocation associated with the arthroscopic Bankart procedure. This suggests that there may in fact be an inherent difference between the arthroscopic and open Bankart procedures that cannot be improved with further technical nuances.

The Latarjet repair mechanically restores stability in a completely different manner. In addition to providing stability by repairing the Bankart lesion, the coracoid transfer provides the most robust anterior restraint by managing bone loss of the glenoid (a known risk factor for re-dislocation¹¹) and providing a dynamic soft-tissue restrain. This is reflected in the low re-dislocation rate and trend toward decreased subjective instability compared with either open or arthroscopic Bankart. However, despite increased surgical dissection and significant anatomical distortion, no statistically significant benefit was shown compared to the open Bankart repair. Unfortunately, given the limitations of a systematic review, we are unable to elucidate the contribution by patients with significant glenoid or humeral bone loss,⁵⁰ which may be considered a contraindication to a standard Bankart repair. This highlights the importance of screening patients for bone deficiency and appropriate procedure selection when considering a soft-tissue repair.¹⁰

The high rate of persistent subjective instability, irrespective of procedure choice, at long-term follow-up is concerning. Despite the significant effect on patient function associated with recurrent subjective instability, it is difficult to interpret this result in the context of a broad range of patient age and functional expectation that are included in the analysis. Furthermore, the long-term functional and clinical significance of this finding is unknown especially in the setting of –high mean post-operative Rowe scores.

Dislocation arthropathy was initially introduced by Samilson and Prieto²¹ in 1938 after a high proportion of patients with soft-tissue tensioning procedures returned with painful, stiff shoulders at 13 years follow-up. However, arthropathy is also part of the natural history of anterior shoulder dislocation. Hovelius et al⁵¹ documented mild-to-moderate arthropathy in 20% of patients who sustained anterior dislocations at 10 years of follow-up. In a follow-up study, Hovelius and Saeboe⁵² documented the development of radiographic osteoarthritis in 56% of dislocators at 25 years follow-up. Importantly, they demonstrated that operative treatment reduced the overall rate of arthropathy, although patients with severe arthropathy were not salvaged by a stabilization procedure. In our study, there was a similarly high rate of radiographic arthropathy with all three reconstructive procedures. The relatively consistent rate of radiographic arthritic changes between groups supports the conclusion that, in the absence of obvious complication, dislocation arthropathy likely arises from the injury rather than the surgical procedure.

The relevance of dislocation arthropathy is clouded by poor correlation between radiographic and clinical arthritis.⁵¹ While multiple authors have documented high rates of radiographic evidence, the preponderance of cases in this analysis is in the mild–moderate spectrum. In a large, multi-centered trial of shoulder arthroplasty, Matsoukis et al⁵³ documented that only 4% of 1542 arthroplasties were completed for dislocation arthropathy. Given the common prevalence of shoulder dislocation, it is clear that few will actually progress to debilitating symptomatic arthritis. However, Fabre et al³⁰ have shown that while some patients with severe glenohumeral arthritis have excellent functional scores, there is a trend toward worse outcomes with progression in the degree of radiographic arthritis.

The arthroscopic Bankart repairs had statistically less complications compared to the open Latarjet. While this is consistent with the literature regarding arthroscopic versus open surgery,⁵⁴ the fact that there were no complications reported in any of the six studies likely indicates a reporting bias. Complications resulting from the Latarjet procedure are specific to the procedure itself (i.e., intra-articular hardware, graft non-union or mal-union) but can result in catastrophic failure with significant patient morbidity. Care must be taken with the interpretation of this statistic as the definitions used in this study exclude recurrent dislocation as a complication. In patient care, this represents a major source of patient morbidity and a failure of the procedure.

The possibility for revision surgery is an important consideration in any anterior stabilization procedure. While there is a higher rate of re-dislocation associated with both the open and arthroscopic Bankart procedures, these repairs are anatomy-preserving procedures. The arthroscopic Bankart procedure has had success as a revision procedure for both failed open and arthroscopic Bankart repairs, without outcomes similar to primary Bankart repairs.^55,56 In comparison, the Latarjet procedure is a reconstructive rather than reparative procedure and is anatomy distorting. Revision surgery, while less common, is difficult and fraught with complications.⁵⁷

Unfortunately, several valid limitations exist within the included studies. The first of these is the uniformly low level of evidence of included studies, a factor that has been shown to influence the results of systematic reviews and meta-analyses in this area, particularly with functional scores.⁴⁸ The reported outcomes throughout the studies also vary considerably. Of the 28 included studies, only 21 reported Rowe scores, 19 reported radiographic arthrosis and 25 reported complications. Furthermore, although both the Rowe score and the Samilson–Prieto classification are commonly used in the shoulder literature, they are based on historical expert opinion and are known to have low inter-observer reliability.^58,59

Many of the remaining limitations of this study are consistent with those of systematic reviews in general. The patient population includes a broad selection of patients with different ages, functional demands, frequency of instability episodes and time to surgery, making the results difficult to apply to any particular patient. We are also unable to elucidate the mechanism of the recurrent dislocations and are therefore unable to differentiate between atraumatic events that may be secondary to surgical technique and traumatic instability events during participation in high-risk sports. Finally, the data extracted are unable to provide information on the prevalence of patient-specific risk factors or specific post-operative rehabilitation protocols.

Conclusion

Each of the three anterior shoulder stabilization repairs dramatically reduced the incidence of dislocation. However, 15–20% of patients will have subjective instability post-operatively. The Latarjet procedure had the lowest re-dislocation rate, which was significantly lower than that of the arthroscopic Bankart repair. Regardless of surgical procedure, nearly half of patients having surgery for anterior shoulder instability will develop radiographic glenohumeral arthritis.

Further investigation will be required in this area as the surgical technique for the arthroscopic Bankart continues to evolve and the Latarjet procedure continues its expansion from expert users in Europe to North America. Future studies are also needed to investigate the functional impact and clinical significance of dislocation arthropathy.

Acknowledgment

An author, their immediate family or any research foundation with which they are affiliated has received royalties, research support or fellowship support from Arthrex, Lippincott Williams and Wilkins, Smith & Nephew and Conmed Linvatec.

Disclosure

The authors report no conflicts of interest in this work.

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