Kazutaka Kinugasa1, Masayuki Hamada2, Kenji Yoneda3, Tomohiko Matsuo1, Tatsuo Mae4, Konsei Shino5. 1. Department of Orthopaedic Surgery, Hoshigaoka Medical Center, 4-8-1 Hoshigaoka, Hirakata, Osaka, 573-8511, Japan. 2. Department of Orthopaedic Surgery, Hoshigaoka Medical Center, 4-8-1 Hoshigaoka, Hirakata, Osaka, 573-8511, Japan. hamada-m@umin.ac.jp. 3. Department of Orthopaedic Surgery, Moriguchi Keijinkai Hospital, Osaka, Japan. 4. Department of Orthopaedic Surgery, Osaka University Graduate School of Medicine, Osaka, Japan. 5. Sports Orthopaedic Center, Yukioka Hospital, Osaka, Japan.
Abstract
PURPOSE: The purpose was to evaluate the cross-sectional area changes in hamstring tendon autografts up to 5 years after the anatomic triple-bundle anterior cruciate ligament (ACL) reconstruction. METHODS: A total of 178 MRI scans from 139 patients (35 males, 104 females, mean age 30.4 years) with the anatomic triple-bundle ACL reconstructions were obtained to evaluate the cross-sectional area of the ACL grafts. They were classified into seven groups according to the period from reconstruction to MRI evaluation: Group -2 months (m.), Group 3-6 m., Group 7-12 m, Group 1-2 years (y.), Group 2-3 y., Group 3-4 y., and Group 4 y.-. Intra-operatively, the cross-sectional area of the graft was measured directly using a custom-made area micrometre. Post-operatively, the cross-sectional area of the grafts' mid-substance was measured with oblique axial MRI slices perpendicular to the long axis of the grafts using a digital radiology viewing program. The percent increase in the cross-sectional area was calculated by dividing the post-operative cross-sectional area by the intra-operative cross-sectional area. RESULTS: The mean percent increase in the cross-sectional area in Groups -2 m., 3-6 m., 7-12 m., 1-2 y., 2-3 y., 3-4 y., and 4 y.- was 105.7 ± 14.0, 134.9 ± 20.0, 137.3 ± 27.8, 129.4 ± 22.2, 124.1 ± 20.4, 117.8 ± 16.9, and 117.1 ± 17.2 %, respectively. The percent increase in Groups 3-6 m., 7-12 m., and 1-2 y. was significantly greater than in Group -2 m., while that in Group 4 y.- was significantly less than in Group 7-12 m. CONCLUSIONS: The cross-sectional area of the hamstring tendon autografts after the anatomic triple-bundle ACL reconstruction increases over time up to 1 year post-operatively, decreases gradually thereafter, and reaches plateau at around 3 years. LEVEL OF EVIDENCE: Retrospective case series, Level IV.
PURPOSE: The purpose was to evaluate the cross-sectional area changes in hamstring tendon autografts up to 5 years after the anatomic triple-bundle anterior cruciate ligament (ACL) reconstruction. METHODS: A total of 178 MRI scans from 139 patients (35 males, 104 females, mean age 30.4 years) with the anatomic triple-bundle ACL reconstructions were obtained to evaluate the cross-sectional area of the ACL grafts. They were classified into seven groups according to the period from reconstruction to MRI evaluation: Group -2 months (m.), Group 3-6 m., Group 7-12 m, Group 1-2 years (y.), Group 2-3 y., Group 3-4 y., and Group 4 y.-. Intra-operatively, the cross-sectional area of the graft was measured directly using a custom-made area micrometre. Post-operatively, the cross-sectional area of the grafts' mid-substance was measured with oblique axial MRI slices perpendicular to the long axis of the grafts using a digital radiology viewing program. The percent increase in the cross-sectional area was calculated by dividing the post-operative cross-sectional area by the intra-operative cross-sectional area. RESULTS: The mean percent increase in the cross-sectional area in Groups -2 m., 3-6 m., 7-12 m., 1-2 y., 2-3 y., 3-4 y., and 4 y.- was 105.7 ± 14.0, 134.9 ± 20.0, 137.3 ± 27.8, 129.4 ± 22.2, 124.1 ± 20.4, 117.8 ± 16.9, and 117.1 ± 17.2 %, respectively. The percent increase in Groups 3-6 m., 7-12 m., and 1-2 y. was significantly greater than in Group -2 m., while that in Group 4 y.- was significantly less than in Group 7-12 m. CONCLUSIONS: The cross-sectional area of the hamstring tendon autografts after the anatomic triple-bundle ACL reconstruction increases over time up to 1 year post-operatively, decreases gradually thereafter, and reaches plateau at around 3 years. LEVEL OF EVIDENCE: Retrospective case series, Level IV.
Authors: Andreas Weiler; Cornelius Förster; Patrick Hunt; Roman Falk; Tobias Jung; Frank N Unterhauser; Volker Bergmann; Gerhard Schmidmaier; Norbert P Haas Journal: Am J Sports Med Date: 2004-06 Impact factor: 6.202
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