Can tape-screw fixation of a quadrupled semitendinosus graft in a full-length tibial tunnel provide superior fixation compared with a doubled semitendinosus-gracilis held with an interference screw? A matched-pair cadaveric biomechanical comparison.

摘要: In anterior cruciate ligament reconstruction, quadrupled semitendinosus (Quad ST) grafts have potential advantages over doubled semitendinosus–gracilis (ST/G) including larger diameter and gracilis preservation, however the ideal tibial fixation method of resultant shorter Quad ST graft remains elusive if a fixed-loop suspensory device is used on femur. We investigated whether biomechanical properties fixed indirectly with polyethylene terephthalate tape tied screw in full outside-in created tunnel was superior to ST/G an interference screw. controlled laboratory study, six cadaveric matched pairs each construct were subjected cyclic loading mimic physiologic during rehabilitation. This included preconditioning cycling, 220 N for 500 cycles, then 500 N cycles. High standard deviations across measured parameters occurred no significant difference between elongation different constructs. Elongation Quad-ST greater at 10 100 but not statistically different. Four constructs failed below compared two failures cycles construct. There strong correlation failure bone mineral density ST-tape Tibial tape–screw full-length biomechanically screw, exhibited nonsignificant earlier failure, more reliant density. In vitro study.