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KMID : 0828620080120010032
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Journal of Korean Arthroscopy Society
2008 Volume.12 No. 1 p.32 ~ p.39
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The effectiveness of MRI evaluation after anterior cruciate ligament reconstruction using hamstring tendon autograft
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Kim Jin-Goo
Shim Jae-Chan
Kim Young-Woo
Lee Soo-Won
Oh Soo-Jin
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Abstract
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Purpose: To evaluate the effectiveness of MRI after ACL reconstruction with femoral tunnel at 10 o’clock position.
Material and Methods : MRI findings of 29 patients after ACL reconstruction using hamstring tendon autograft were evaluated. The mean period from operation to MRI was 18.9 months (7~40 months). Signal intensity, morphology and continuity of graft, femoral insertion, graft angle, roof impingement, cross pin breakage and position were evaluated. Those findings were compared with KT-2000, Lysholm knee score and pivot shift test.
Results: There was no significant correlation between signal intensity of graft and the duration to MRI. Most common pattern of the morphology was straight, and the continuity was well-preserved. 13 cases of femoral tunnel insertion were zone 4 and 16 were zone 3. There were no roof impingement. 10 cases showed cross pin breakages, of which 5 were found at the outside of distal femoral posterior cortex. 9 showed cross pin directed posteriorly in axial view. There was no significant correlation between clinical results and cross pin breakage.
Conclusion: MRI examinations after ACL reconstructions are useful to evaluate the graft status, position of the graft and cross pins. Since the direction of the cross pin is important especially in 10 o’clock femoral position, care should be taken to avoid cross pin breakage.
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KEYWORD
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Anterior cruciate ligament reconstruction, MRI, Graft position, Cross pin
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