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The American Journal of Sports Medicine 30:361-367 (2002)
© 2002 American Orthopaedic Society for Sports Medicine

Kinematics and Laxity of the Knee Joint after Anterior Cruciate Ligament Reconstruction

Pre- and Postoperative Radiostereometric Studies

Sveinbjörn Brandsson, MD, PhD, Jon Karlsson, MD, PhD,*, Leif Swärd, MD, PhD, Jüri Kartus, MD, PhD, Bengt I. Eriksson, MD, PhD and Johan Kärrholm, MD, PhD

Department of Orthopaedics, Sahlgrenska University Hospital, Göteborg, Sweden

* Address correspondence and reprint requests to Jon Karlsson, MD, PhD, Department of Orthopaedics, Sahlgrenska University Hospital, SE-416 85 Göteborg, Sweden

Background: Injury of the anterior cruciate ligament changes the kinematics of the knee joint. In studies of cadaveric knees, investigators have examined the effect of anterior cruciate ligament reconstruction on knee kinematics, but the effect on dynamic knee motion is not known.

Hypothesis: Reconstruction of the anterior cruciate ligament restores knee kinematics to normal.

Study Design: Prospective cohort study.

Methods: Nine patients were examined preoperatively and 1 year after reconstruction. Continuous radiostereometric exposures were performed at a speed of two to four exposures per second while the patients ascended an 8-cm high platform. Tibial rotation and tibial and femoral translation were measured with radiostereometric analysis.

Results: Tibial rotation and tibial and femoral translation were not significantly different after anterior cruciate ligament reconstruction compared with preoperative measurements. A radiostereometric evaluation of anterior knee laxity revealed restoration to within 1 mm of that on the uninjured side. Further evaluation of knee function using the Lysholm score, the Tegner activity level score, the International Knee Documentation Committee evaluation system score, and measurements of laxity using the KT-1000 arthrometer revealed significant improvements after reconstruction.

Conclusion: Kinematics of the anterior cruciate ligament injured knee did not change significantly after ligament reconstruction, but the functional results were satisfactory and knee laxity was diminished.




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