Biomechanical comparison of screw-in suture anchor-suture combinations used for Bankart repair.
BACKGROUND
Bankart repair laxity may contribute to pathologic joint instability. This biomechanical study compared two screw-in suture anchor-suture combinations under tensile loads.


METHODS
Twelve pairs of scapulae were implanted with either a 3 mm diameter, 14 mm long poly-L/D-lactide suture anchor with a suture eyelet (Group 1) or a 3.1 mm diameter, 11 mm long polylactide suture anchor with a molded eyelet (Group 2). Constructs were cyclically loaded between 25 and 50 N with a 25 N load increase every 25 cycles.


RESULTS
Group 2 displayed greater displacement at failure, had more specimens with > or =2 mm displacement by the 50 N interval (P = 0.014), and had displaced more by 100 N (P < or = 0.046). Group 1 displayed a stronger load-displacement at failure relationship than Group 2 (r (2) = 0.67 vs. r (2) = 0.37).


CONCLUSIONS
Construct differences may influence decisions regarding the required number of suture anchor-suture loops, the rehabilitation timetable, and the timing of return to unrestricted activities.
Sparks
Brad S
BS
Division of Sports Medicine, Department of Orthopaedic Surgery, University of Louisville, 210 East Gray Street, Louisville, KY 40202, USA.
Nyland
John
J
Nawab
Akbar
A
Blackburn
Ethan
E
Krupp
Ryan
R
Caborn
David N M
DN
D020341:Absorbable Implants; D000368:Aged; D001182:Arthroscopy; D001696:Biomechanical Phenomena; D002102:Cadaver; D004868:Equipment Failure; D005260:Female; D006801:Humans; D008297:Male; D012540:Scapula / Q000601:surgery*; D012785:Shoulder Joint / Q000601:surgery*; D013536:Suture Techniques; D013537:Sutures