112. FAILURE OF ARTHROSCOPIC TREATMENT OF ANTERIOR INSTABILITY: PATIENT OUTCOME, RESULTS OF REVISION FOR A CORACOID BLOCK

Abstract

Purpose of the study: Several series have been reported on arthroscopic treatment of anterior instability. Few authors have focused on patient outcome after recurrent instability following arthroscopic stabilisation. Did these patients undergo revision surgery? What proportion? What were the results of secondary surgical coracoids block?

Material and methods: This was a retrospective analysis of 53 failures after arthroscopic stabilisation collected among a cohort of 182 patients who underwent surgery in our institution between 1988 and 2006. At last follow-up, shoulder function was noted using the Walch-Duplay score. The degree of joint degenerative disease was noted on the radiographs using the Samilson classification.

Results: Mean time to recurrence after arthroscopic stabilisation was 21 months (range 3–114). Patients were reviewed at mean 68 months. Twenty-four patients (45%° had not had revision surgery: 17 (32%) had declined a new operation and 7 (13%) had a unique episode of instability. Twenty-nine patients (55%) had revision surgery: 27 underwent an open procedure in our institution for a coracoids block. The revision was performed in another institution for two patients who were excluded from the analysis. Mean time between the two operations was 29 months. At last follow-up, 89% of the reoperated patients were satisfied. The mean Walch-Duplay score was 83.6/100 (activity=18.5; stability=15.9; pain=23.9; mobility=24.2). The Duplay score was 100 for 48% of the reoperated patients; 41% had persistent apprehension. Three patients (11%) developed recurrent dislocation at a mean 23 months (19–29). Among the 53 patients included in the study, 26% had moderate osteoarthritic lesions (Samilson 1 or 2). The reoperated patients were free of such lesions. Hyperlaxity, age, and sport practiced did not have any impact on surgical revision.

Discussion: In this overall series of 53 patients, 20 (37%) retained an unstable shoulder. Among them, 17 had declined new surgery. Eleven percent of the reoperated patients developed subsequent recurrence. This rate is higher than after first-intention blocks. Published series of arthroscopic revisions reported a higher recurrence rate (Kim, Arthroscopy 2002: 21 % recurrence; Neri, JSES 2007: 27 % recurrence).

Conclusion: The Latarjet block is the treatment of choice after failure of arthroscopic stabilisation, despite a high recurrence rate.