A biomechanical comparison of the Delta screw and RetroScrew tibial fixation on initial intra-articular graft tension
- نوع فایل : کتاب
- زبان : انگلیسی
- مؤلف : Peter C. Rhee • Bruce A. Levy • Michael J. Stuart • Andrew Thoreson • Kai-Nan An • Diane L. Dahm
- چاپ و سال / کشور: 2011
Description
effect of bioabsorbable interference screw (BIS) tibial fixation with the Delta screw (antegrade) and RetroScrew (retrograde) on initial (time zero) intra-articular graft tension in soft tissue anterior cruciate ligament (ACL) reconstruction in a cadaveric model. Methods Ten matched pairs of cadaveric tibias received one of two tibial fixation constructs using quadrupled hamstring grafts, Delta screw (antegrade) or the Retro- Screw (retrograde). Each specimen was mounted to the materials testing device with the displacement force vector in line with the tibial tunnel. The construct was pre-tensioned (10–30 N, 0.1 Hz, 10 cycles), a baseline tension of 25 N was introduced, and the change in intra-articular graft tension before and after screw insertion was recorded. Results Segmental (proximal, middle, distal) BMD was utilized to assess BMD using quantitative computed tomography (qCT). The Delta screw had a higher maximum insertion torque (P = 0.03) and exhibited a larger increase in intra-articular graft tension as compared to the RetroScrew (38.3 ± 17.9 N, 7.6 N ± 14.4, P = 0.004), respectively. There were no significant correlations between intra-articular graft tension increase to maximum insertion torque (P = NS) or corresponding segmental BMD (P = NS). Conclusions Delta screw tibial fixation (antegrade) in soft tissue ACL reconstruction significantly increases the initial intra-articular graft tension as compared to RetroScrew screw fixation (retrograde) in this cadaveric model. Delta screw (antegrade) tibial fixation may increase initial quadrupled hamstring graft intra-articular tension with currently accepted insertion techniques
Knee Surg Sports Traumatol Arthrosc (2011) 19:781–786 DOI 10.1007/s00167-010-1366-z Received: 11 May 2010 / Accepted: 13 December 2010 / Published online: 22 January 2011
