Muscle strength after anterior shoulder stabilization: arthroscopic versus open Bankart repair.
BACKGROUND
A number of reports have been made on the muscle strength at the last follow-up after arthroscopic or open Bankart repairs. Few have analyzed the change over time in muscle strength and compared the changes between different operative methods.


OBJECTIVE
Muscle strength recovers faster after arthroscopic Bankart repair than after open Bankart repair, and the final muscle strength is not different between the 2 procedures.


METHODS
Cohort study; Level of evidence, 2.


METHODS
Sixty patients with anterior shoulder instability and an isolated Bankart lesion were enrolled for this study. Thirty patients underwent open Bankart repair (open group), and 30 patients went through arthroscopic Bankart repair (arthroscopic group).


RESULTS
The open group demonstrated markedly weaker muscle strength during forward elevation than did the arthroscopic group up to 3 months after surgery, but the difference narrowed to about 5% at 6 months (P = .074). At 6 months after surgery, the muscle strength of the open group measured 85.8% +/- 11.5% in forward elevation, 89.5% +/- 10.3% in external rotation, and 89.3% +/- 13.3% in internal rotation. The corresponding figures of the arthroscopic group were 90.6% +/- 8.6%, 92.1% +/- 9.1%, and 92.1% +/- 11.7%. As for external and internal rotations, the open group demonstrated markedly weaker muscle strength 6 weeks after surgery, but the differences were reduced to about 6% and 4%, respectively, at 3 months (P = .092 and .163, respectively). There was no statistically significant difference in final muscle strength 12 months after the operation between the 2 groups (P = .503, .468, and .659, respectively).


CONCLUSIONS
Muscle strength recovered faster with an arthroscopic procedure than with an open procedure during the early postoperative periods, and strength was restored to the level of the unaffected side at 6 months postoperatively. In the group with open Bankart repairs, the muscle strength during forward elevation recovered slower than did external and internal rotation muscle strengths.
Rhee
Yong Girl
YG
Shoulder & Elbow Clinic, Department of Orthopaedic Surgery, School of Medicine, Kyung Hee University, 1 Hoiki-dong, Dongdaemoonku, Seoul 130-702, Korea. shoulderrhee@hanmail.net
Lim
Chan Teak
CT
Cho
Nam Su
NS
D000293:Adolescent; D000328:Adult; D001182:Arthroscopy; D005260:Female; D006801:Humans; D007593:Joint Instability / Q000601:surgery*; D008279:Magnetic Resonance Imaging; D008297:Male; D053580:Muscle Strength; D019637:Orthopedic Procedures / Q000379:methods; D010147:Pain Measurement; D011446:Prospective Studies; D016059:Range of Motion, Articular; D012399:Rotation; D012785:Shoulder Joint / Q000601:surgery*; D016896:Treatment Outcome