Comparison of the bioabsorbable and metal screw fixation after ACL reconstruction with a hamstring autograft in MRI and clinical outcome: a prospective randomized study |
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Authors: | Anna-Stina Moisala Timo Järvelä Antti Paakkala Timo Paakkala Pekka Kannus Markku Järvinen |
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Institution: | 1. Division of Orthopaedics and Traumatology, Department of Trauma, Musculoskeletal Surgery and Rehabilitation, Tampere University Hospital, Medical School, University of Tampere, Teiskontie 35, 33014, Tampere, Finland 2. Orthopaedic Department and Arthroscopic Center, Hatanp?? Hospital, Tampere, Finland 3. Sports Clinic and Hospital Mehil?inen, Tampere, Finland 4. Department of Radiology, Tampere University Hospital, Tampere University, Tampere, Finland 5. Injury and Osteoporosis Research Center, UKK Institute, Tampere, Finland
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Abstract: | There has never been an MRI study of tunnel widening comparing bioabsorbable to metal screw fixation in autologous hamstring
anterior cruciate ligament (ACL) reconstruction. We randomized 62 patients to hamstring ACL reconstruction with either a bioabsorbable
(n = 31) or metal screw (n = 31) fixation. The evaluation methods were clinical examination, KT-1000 arthrometric measurement, the International Knee
Documentation Committee and Lysholm scores, and MRI. There were no differences between the groups preoperatively. Fifty-five
patients (89%) were available at a minimum of 2-year follow-up (range 24–36 months). There was tunnel widening in both groups,
but the increase was significantly greater in the AP dimension of the femoral tunnel in the bioabsorbable screw group compared
to metal group (P = 0.01). The tibial tunnels showed no intergroup difference. Ninety-four percent of the knees were normal or nearly normal
according to the IKDC scores and the average Lysholm score was 91 with no intergroup difference. The follow-up AP tibial tunnel
diameter was smaller with normal knee laxity compared to abnormal knee laxity. The graft failure rate in the bioabsorbable
screw group was 23% (7/31 patients) and 6% (2/31 patients) in the metal screw group. The use of bioabsorbable screws resulted
in more femoral tunnel widening, and more graft failures compared to metal screws. The tunnel widening in the tibia was associated
with the knee laxity (P = 0.02). |
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Keywords: | Bioabsorbable screw Anterior cruciate ligament reconstruction Tunnel enlargement Tunnel widening MRI Prospective Clinical outcome Hamstring graft |
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