Components of laxity in interference fit fixation of quadrupled hamstring grafts

Acta Orthopaedica Scandinavica
M E RittmeisterH W Kohl

Abstract

We tested in vitro 15 Poly-L-lactic acid and 14 titanium interference screws in male human cadaver tibia-hamstring constructs. Elongation of the graft, displacement of the screw in the tibial tunnel, and slippage at the graft/screw interface were measured as outcomes with an infrared optical system. All constructs failed by slippage of the graft past the interference screw. On average, graft slippage accounted for 92% of total construct laxity at 5mm total construct elongation, whereas permanent stretching of the midsubstance of the graft accounted for only 8%. Movement of the interference screw in the tibial canal was minimal, averaging 0.01 (0-0.5) mm at construct failure. Inadequacy of isolated tibial interference screw fixation of soft tissue grafts may be overcome if early failure at the graft/screw interface is prevented.

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Citations

Jun 10, 2005·Arthroscopy : the Journal of Arthroscopic & Related Surgery : Official Publication of the Arthroscopy Association of North America and the International Arthroscopy Association·David A HayesRoss W Crawford
Mar 24, 2009·Knee Surgery, Sports Traumatology, Arthroscopy : Official Journal of the ESSKA·Yan Xu, Ying-fang Ao
Feb 6, 2007·Arthroscopy : the Journal of Arthroscopic & Related Surgery : Official Publication of the Arthroscopy Association of North America and the International Arthroscopy Association·Thomas M LargeJames E Fleischli
May 23, 2009·The American Journal of Sports Medicine·Daniel K ParkMatthew T Provencher

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