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KNEE KINEMATICS FOLLOWING SUCCESSFUL ACL RECONSTRUCTION – A DYNAMIC MRI ANALYSIS OF TIBIO-FEMORAL MOTION



Abstract

Purpose: To assess if ACL reconstruction restores normal knee kinematics.

Methods: Tibiofemoral motion was assessed weight-bearing through the arc of flexion from 0 to 90° in ten patients who were at least 6 months following successful hamstring graft ACL reconstruction. Lachman’s test was also performed using dynamic MRI. Mid-medial and mid-lateral images were analysed in all positions to assess the tibiofemoral relationship.

Results: The laxity of the reconstructed knees was reduced to within normal limits. However the normal tibiofemoral relationship was not restored after ACL reconstruction with persistent anterior subluxation of the lateral tibial plateau throughout the arc of flexion 0–90°(p< 0.001).

Conclusion: Successful ACL reconstruction reduces joint laxity and improves stability but it does not restore normal knee kinematics.


* Address for correspondence: Martin Logan, Clinical Research Fellow in Trauma and Orthopaedics, Interventional MRI Unit, St. Mary’s Hospital, Praed St., London W2 1NY. e-mail: mlogan100@hotmail.com Tel. 020 7886 6496 (Work), 07733 070786 (Mobile)

The abstracts were prepared by Mr Roger Smith. Correspondence should be addressed to him at the British Association for Surgery of the Knee, c/o BOA, Royal College of Surgeons of England, 35–43 Lincoln’s Inn Fields, London WC2A 3PN.