Functional outcome after open and arthroscopic Bankart repair for traumatic shoulder instability
European Journal of Medical Research volume 14, Article number: 18 (2009)
Both open and arthroscopic Bankart repair are established procedures in the treatment of anterior shoulder instability. While the open procedure is still considered as the "golden standard" functional outcome is supposed to be better in the arthroscopic procedure. The aim of this retrospective study was to compare the functional outcome between open and arthroscopic Bankart repair.
Materials and methods
In 199 patients a Bankart procedure with suture anchors was performed, either arthroscopically in presence of an detached, but not elongated capsulolabral complex (40) or open (159). After a median time of 31 months (12 to 67 months) 174 patients were contacted and agreed to follow-up, 135 after open and 39 after arthroscopic Bankart procedure.
Re-dislocations occurred in 8% after open and 15% after arthroscopic Bankart procedure. After open surgery 4 of the 11 re-dislocations occurred after a new adequate trauma and 1 of the 6 re-dislocations after arthroscopic surgery. Re-dislocations after arthroscopic procedure occured earlier than after open Bankart repair. An external rotation lag of 20° or more was observed more often (16%) after open than after arthroscopic surgery (3%). The Rowe score demonstrated "good" or "excellent" functional results in 87% after open and in 80% patients after arthroscopic treatment.
In this retrospective investigation the open Bankart procedure demonstrated good functional results. The arthroscopic treatment without capsular shift resulted in a better range of motion, but showed a tendency towards more frequently and earlier recurrence of instability. Sensitive patient selection for arthroscopic Bankart repair is recommended especially in patients with more than five dislocations.
In 1938 Bankart  reported excellent results of re-attachment of the capsulolabral complex in patients with anterior shoulder instability, a method first described by Perthes . This technique is based on the premis that detachment of the anteroinferior capsulolabral complex is the cause for recurrent dislocations and therefore refixation is the therapy of choice. Since then open "Bankart repair" with minor modifications has been performed with good results and low recurrence rates and therefore was considered as the "golden standard". Rowe  reported in 1978 excellent and good functional results in 97% and a recurrence rate of 3.5% with this technique after an average follow-up duration of 6 years. Different studies have proven this technique as a sucessful treatment for traumatic anterior shoulder instability with recurrence rates below 10% [13, 15, 16, 24, 29, 32, 40]. However, long-term follow-up studies and investigations including subluxation as a failure demonstrated a higher recurrence rate than expected .
Problems reported to be associated with open Bankart repair include restriction in external rotation [4, 6, 17, 21] and subscapularis muscle insufficiency . Therefore less invasive arthroscopic techniques have been developed and have improved from disappointingly high recurrence rates with staple capsulorrhaphy , transglenoid sutures [14, 30] and bioabsorbable tacks  to promising results with suture anchors equal to open procedures [3, 5, 9, 11, 19, 23]. Arthroscopic stabilization is considered advantageous in terms of decreased morbidity with reduced pain and shorter hospitalization (if necessary at all), faster rehabilitation, no violation of the subscapularis tendon and no loss in range of motion . Nevertheless, higher recurrence rates compared to the open procedure have been reported [10, 20, 38].
The intention of this investigation was to compare open and arthroscopic Bankart repair concerning functional outcome and stability at mid-term follow-up.
Materials and methods
In this retrospective cross-sectional study patients were reviewed, who underwent surgical treatment for shoulder instability at the authors' Orthopedic department. In 1995 a modified Bankart procedure without osteotomy of the coracoid process became the standard operation for traumatic anterior shoulder instability at the authors' department. A total of 212 patients were treated between 1995 and June 2004 for traumatic anterior shoulder dislocation (TUBS) according to the criteria of Matsen .
Most patients (206, 97%) had recurrent dislocations, 169 (80%) were male and 43 (20%) female. In 109 patients (51%) the dominant side was involved. Age at first dislocation was in median 22 years (range 5 to 67 years), the time from first dislocation to surgery was in median 28 month (ranging from 1 month to 8 years).
21 patients had an osseus Bankart lesion, in four patients the Bankart fragment could be fixed with screws, nine patients suffering from loss of the anterior glenoid of more than 20% required a reconstruction with iliac crest bone grafting and were excluded from this study. Eight patients with only small osseus fragments were treated with refixation of the capsulolabral complex with suture anchors and were included in this study.
In a total of 199 patients a Bankart procedure with suture anchors was performed (median age at surgery 26 years, 20% females), either arthroscopically in presence of an detached, but not elongated capsulolabral complex (40, 20%) or open (159, 80%). In 56 of these 159 patients (28%) with a wide capsule an additional inferior capsular shift as described by Neer  was performed.
Patients who underwent open surgery showed a median age of 27 years (22% females) versus 25 years among the arthroscopically treated patients (13% females). A total of 36% (open) and 40% (arthroscopic) of them reported more than five dislocations before surgery. Three patients treated with open surgery and four patients treated arthroscopically had an additional SLAP lesion. There were 12 partial lesion of the supraspinatus tendon in the open group, the rotator cuff was intakt in all arthroscopic treated patients The demographic data for the patient samples are summarized in Table 1.
All patients were operated on under general anesthesia and in beach-chair position. After diagnostic arthroscopy through the standard dorsal portal the decision was made whether to continue with arthroscopic or open surgery.
In cases of detached, but intact capsulolabral complex and no visually elongated capsule an arthroscopic fixation using suture anchors was performed. Additional antero-superior and anterior portals were used. In the other cases an open procedure using a deltoideo-pectoral approach with an L-shaped incision of the upper two third of the subscapularis tendon was performed. The capsular incision was done laterally, in cases of elongated capsule a lateral based T-shaped incision was used and an inferior shift was done.
In all cases the anteroinferior capsulolabral complex was separated from the glenoid and anatomical repair was performed with two to three suture anchors (FAS-Tak, Fa.Arthrex; Mini-Revo, Fa.Linvatec; Mitek GII, Fa.Depuy-Mitek). The distal anchor was placed at 5 to 5.30 o'clock in aright shoulder. No capsular shift was done in the arthroscopic cases.
All patients underwent a similar rehabilitation protocol. Instructions were given to the patient by a physiotherapist during hospital stay and in written form for the further therapy. The arm was immobilized in a Gilchrist cast for 6 weeks and only passive motion twice a day (anteversion up to 90°, no abduction, no external rotation) was allowed. During the 7th to the 12th week after surgery active movement was allowed and full range of motion was achieved assisted by physiotherapy. Throwing position was allowed after week 12.
After a median time of 31 months (12 to 67 months) 174 patients were contacted and agreed to follow-up; a total of 143 of them underwent a clinical examination and a written interview with a questionnaire, further 31 patients only answered the questionaire. Among these recall patients 135 had undergone an open and 39 an arthroscopic Bankart procedure. A total of 24 patients were lost to follow-up.
The questionnaire included information about recurrent instability (dislocation, subluxation or feeling of instability) as well as questions to loss of function and subjective rating. The clinical examination included assessment of range of motion, stability (apprehension and relocation test 36), loss of function and strength in order to obtain the Rowe Score 33 and a modified Rowe Score 34 adapted for subluxations. The lift-off test 12 was applied to determine subscapularis muscle insufficiency.
The primary analysis was performed via Kaplan/Meier estimation of the dislocation-free time after initial surgery; the description of the survival estimates was based on the mean dislocation-free times after the respective surgical treatment and the corresponding 95% confidence intervals. The Kaplan/Meier estimates for the time to dislocation after open versus arthroscopic treatment were then compared by means of a univariate Logrank test and by means of a multivariate Cox regression analysis based on Likelihood Ratio tests. The latter adjusted the dislocation patterns of the samples for putative prognostically relevant cofactors such as age and gender. Results of both the univariate and multivariate analysis were summarized in terms of p-values. Due to the exploratory character of the multivariate analysis p-values derived from the latter were not formally adjusted for multiplicity; a p-value < 0.05 therefore indicates a locally significant difference between samples.
In general the data were analysed according to the respective endpoints' scale level: the description of continuous endpoints was based on medians and quartiles, the description of categorical endpoints of appropriate absolute and relative frequencies. The significance comparison of sub samples was based on pairwise two sample Wilcoxon and Fisher tests, accordingly.
All numeric and graphic analyses were performed with SPSS software (release 12.0 for Windows; SPSS Inc, Chicago, IL).
Re-dislocations occurred in 11 (8%) of 135 patients after open and in 6 (15%) of 39 patients after arthroscopic Bankart procedure. After open surgery 4 of these 11 re-dislocations occurred after a new adequate trauma and 1 of the 6 re-dislocations after arthroscopic surgery. This corresponds to an adjusted re-dislocation rate without new adequate trauma of 5% (7 of 135 patients) after open versus 13% (5 of 39 patients) after arthroscopic treatment (Table 2).
Furthermore 4 patients after open and 3 patients after arthroscopic surgery reported subluxations. If both "dislocation for any cause" and "subluxation" are considered as recurrence of instability, the open treatment failed in 15 patients (11%) versus 9 patients after arthroscopic treatment (23%).
After arthroscopic surgery there was an increased rate of failure (re-dislocation and subluxation) observed among patients, who had reported more than 5 dislocations before initial surgery (6 of 16 patients [38%]) versus patients with fewer previous dislocations (3 of 23 patients [13%]). There was no such difference in patients after open surgery.
The mean time interval between surgery and dislocation for any cause was 64 month after open and 41 month after arthroscopic procedure (95% confidence intervals 62 - 67 versus 37 - 45 months, respectively). The underlying dislocation-free time distributions differed statistically significantly (p = 0.0268). Figure 1 displays the corresponding Kaplan/Meier survival estimates.
The Cox regression analysis of the above re-dislocation rates confirmed the surgical procedure as the dominating and statistically significant determinant (Likelihood Ratio p = 0.039): Neither age at first dislocation (p = 0.441) or at recall (p = 0.219), the patient's gender (p = 0.984), the duration between first luxation and initial surgery (p = 0.297) or the self-reported number of dislocations before surgery (p = 0.088) showed a statistically significant association with the time to re-dislocation after surgery.
Functional and subjective outcome
A total of 125 patients (93%) after open surgery versus 30 patients (77%) after arthroscopic treatment were satisfied with the operation (Fisher p = 0.016). Only 2 patients (2%) after open surgery and 2 patients (5%) after arthroscopic treatment would not agree to undergo the same type of surgery again.
Among the 143 patients who underwent clinical examination (108 after open and 35 after arthroscopic treatment) a total of 6 patients (6%) after open and 5 patients (14%) after arthroscopic treatment showed a positive apprehension and relocation test during clinical examination (Fisher p = 0.144).
Concerning range of motion compared to the contralateral side no significant difference between open and arthroscopic Bankart procedure were observed for abduction. An external rotation lag of 20° or more was observed more often (16%) after open than after arthroscopic surgery (3%, Fisher p = 0.073). Using the Lift-off test 12 to determine the subscapularis function there were no clinical signs for subscapularis muscle insufficiency.
The Rowe score  demonstrated "good" or "excellent" functional results in 94 of 108 (87%) patients after open and in 28 of 35 (80%) patients after arthroscopic treatment (Fisher p = 0.409). The modified Rowe 34 score demonstrated "good" or "excellent" functional results in 91 of 108 (84%) patients after open and in 26 of 35 (74%) patients after arthroscopic treatment (Fisher p = 0.210; Table 3). These differences are mainly caused by the number of re-dislocations. Taking only the patients without re-dislocations there are similar results in both groups.
This retrospective investigation demonstrated an numerically increased recurrence rate after arthroscopic compared to open Bankart repair as already reported in previous studies (Table 4) and a recent Meta-Analysis 25, but the observed difference did not reach statistically significance. However, the recurrences of instability after artroscopically treated patients were observed earlier than after open treatment (Figure 1).
These findings may be due to methodological limitation of the study with its retrospective cross-sectional implementation. The treatment samples differed, for example, in the number of dislocations before surgery, in the duration from first dislocation to surgery and in the degree of Bankart lesion and capsular elongation. Another reason for this difference might be the different surgical treatment of the capsule. Although decision for arthroscopic treatment was done after arthroscopic assesment and only patients with considered not elongated capsule were treated arthroscopically the higher recurrence rate in the arthroscopic group may be caused by patient selection. 40% of arthroscopic repairs were performed in patients with more than 5 dislocations before surgery and showed a higher failure rate as has been reported before . The assessment of capsular elongation and quality can be difficult during arthroscopy. We did no capsulorraphy during arthroscopic procedure but an additional capsular shift was performed in 28% of the open Bankart repairs.
Although operated on by a single surgeon (MB) experienced in arthroscopic surgery the number of arthroscopic procedures is quite low and the individual learning curve is included which can lead to a greater recurrence rate [10, 27]. However, there was no increased failure rate in the earlier compared to the later treated patients.
Despite its limitations, this investigation indicates, that the clinical outcome after arthroscopic Bankart procedure with no capsular shift seems to be inferior to the results after open surgery and corresponds to previous studies [6, 10, 17, 20, 21, 37–39] (Table 4). In these studies arthroscopic repair has been performed with different techniques (transglenoid sutures, tacks) and mostly no capsular tightening has been done. Recent studies [4, 9, 22, 42] with suture anchor fixation demonstrate, that equally good results can be achieved for selected patients and in specialized institutions  after arthroscopic Bankart repair.
Main disadvantage of open Bankart procedure is the violation of of the subscapularis tendon and therefore the possibility of subscapularis muscle insufficiency . In our patients with open procedures we did not observe any case of clinical subscapularis muscle insufficiency and therefore we consider this not to be a problem as long as thorough dissection and reattachment of the tendon is done.
Another frequently reported disadvantage is loss of range of motion [4, 6, 17, 21]. We observed an external rotation lag of 20° or more in 16% after open and only 3% after artroscopic treatment. This may be an effect of the capsular shift in the open procedures. This external rotation lag was tolerated by most patients as the better rating after open procedure suggests. Nonetheless this can be a problem for some patients who require full range of motion.
Various scoring systems are established but most studies used the Rowe score  for assessment of functional results after operative shoulder stabilization [3, 9, 20, 23, 32, 38]. We found similar good results as reported by these studies in both groups regarding the Rowe score as well as the modified Rowe score .
In this retrospective investigation the open Bankart procedure demonstrated good functional results, a gradual loss of external rotation which was tolerated by most patients and no clinical signs of subcapularis muscle insufficiency. The arthroscopic treatment without capsular shift resulted in a better range of motion, but showed a tendency towards more frequently and earlier recurrence of instability. The authors recommend sensitive patient selection for arthroscopic Bankart repair especially in patients with more than five dislocations. An additional capsular shift should be performed in these patients.
The data of this paper has been presented at the 8th EFORT Congress, 11-15 May 2007 in Firenze, Italy, at the 24. AGA Congress, 27-29 September 2007 in Köln, Germany and at the Congress of the German Orthopedic Society, 24-27 October 2007, Berlin. Parts of this presentation are contained in the Doctoral Thesis of Ms Juliane Lübke (Dresden University of Technology, Medical Faculty).
Conflict of interests
The authors have no commercial or political interests in the methodological or medical aspects presented in this paper. There are no financial or other relationships that might lead to a conflict of interest. The manuscript has been read and approved by all authors. Each author believes that the manuscript represents innovative and original work.
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Lützner, J., Krummenauer, F., Lübke, J. et al. Functional outcome after open and arthroscopic Bankart repair for traumatic shoulder instability. Eur J Med Res 14, 18 (2009). https://doi.org/10.1186/2047-783X-14-1-18
- traumatic shoulder instability
- Bankart procedure
- open versus arthroscopic procedure