Interference screw fixation of hamstring vs patellar tendon grafts for anterior cruciate ligament reconstruction |
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Authors: | A. K. Aune Arne Ekeland Patrick W. Cawley |
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Affiliation: | (1) Orthopaedic Department, Buskerud Central Hospital, N-3004 Drammen, Norway e-mail: akaune@klinmed.uio.no Tel.: +47-32-80 30 00 Fax: +47-32-80 33 99, NO;(2) Institute for Surgical Research, University of Oslo, Oslo, Norway, NO;(3) Martina Hansens Hospital, Sandvika, Norway, NO;(4) Smith & Nephew Donjoy Inc., Carlsbad, Calif., USA, US |
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Abstract: | The present study was designed to investigate the fixation strength of a quadruple semitendinosus-gracilis graft compared with a middle-third bone-patellar tendon-bone graft using a new interference screw developed to fix hamstrings grafts for ACL reconstructions (RCI, Smith & Nephew Donjoy). Five pairs of human cadaveric knees from donors with a mean age of 43 (range 33–52) years were used. One knee of each pair was randomly allocated to be reconstructed on the femoral side with a semitendinosus-gracilis graft from the same donor using RCI screw fixation. As the control, the contralateral knee was correspondingly reconstructed with a bone-patellar tendon-bone graft using the same interference screw. The grafts were pulled out at a velocity of 30 mm/s by an axially applied load using a MTS machine. The mean (SD) failure load for the bone-patellar tendon-bone graft fixations was 505 (25) N, 110% stronger than the mean failure load for the semitendinosus-gracilis graft fixations, which was 240 (47) N (P = 0.003). The stiffness for the patellar tendon-bone graft fixations was 46 (11) N/mm, 120% stiffer than the semitendinosus-gracilis graft fixations, which was 22 (11) N/mm (P = 0.01). This study shows that the interference screw principle used for ACL reconstructions with hamstrings tendons is inferior to that for bone-patellar tendon-bone reconstructions although the screw was developed especially for soft-tissue fixation in bone tunnels. Received: 14 August 1996 Accepted: 25 September 1997 |
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Keywords: | Anterior cruciate ligament Graft fixation Patellar tendon Hamstrings Quadruple semitendinosus-gracilis graft |
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