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Evaluation of an interference screw for tendon reattachment to small bones
Hiroaki Okuno1, Juichi Tanaka, Hiroyuki Fujioka
1Department of Orthopaedic Surgery, Hyogo Medical College, Nishinomiya, Japan.
Objectives:
To compare the strength of interference screw fixation of the tendon to suture button fixation and staple fixation methods.
Design:
Biomechanical study.
Methods:
The femurs and flexor digitorum tendon of twelve rabbits were used. The tendon was attached to the medial condyle of the femur using one of the following three surgical procedures: (a) interference screw fixation: tendon-junction screw was used as an interference screw, (b) suture button fixation: the tendon was inserted through a hole and attached with a button on the opposite side, and (c) staple fixation: the tendon was attached using two staples. Strengths of the attached tendons were then measured using a universal testing machine.
Results:
The ultimate failure load of interference screw fixation was 62.8 +/- 9.0 N, whereas that of suture button fixation was 13.9 +/- 3.8 N and staple fixation was 23.9 +/- 2.6 N.
Conclusion:
Interference screw fixation provides significant initial fixation strength (p < 0.05).