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COMPARATIVE STUDY OF IN VIVO STABILITY DURING ANTERIOR CRUCIATE LIGAMENT RECONSTRUCTIONS BETWEEN SINGLE BUNDLE AND DOUBLE BUNDLE TECHNIQUES

Center for Joint Disease, Chonnam National University Hwasun Hospital, Jeonnam, Korea

The navigation system recently introduced in an ACL reconstruction is reported that it would be helpful for determining the accurate tunnel position and better clinical results in. It also provides intra-operative information such as knee kinematics and anteroposterior translation and internal-external rotation of the tibia during the reconstruction. Our hypothesis was that a double bundle reconstruction would provide better anteroposterior and rotational stabilities than a single bundle reconstruction.

The aim of this study was to assess the changes of anteroposterior and rotational stabilities using a navigation system achieved by double bundle reconstruction (20 knees) and compare them with those by single bundle reconstruction (20 knees).

After registering the reference points, anteroposterior ad rotational stability test with 30° knee flexion using a navigation system was carried out and measured before and after reconstruction on both groups.

The anteroposterior stability showed significant improvement from 17.5 mm before the reconstruction to 5.1 mm after the reconstruction in the double bundle group and from 16.6 mm to 6.1 mm in the single bundle group, showing a significant inter-group differences (p<.05). The mean rotation stability of the double bundle group showed more significant improvement after reconstruction than those of the single bundle group (9.8° in single and 6.1° in double bundle group, p<.05).

The double bundle ACL reconstruction tends to be more stable in rotational stability than the single bundle reconstruction, but not so much in anteroposterior stability. Clinically the double bundle ACL reconstruction may provide better rotational stability reducing residual pivot shift phenomenon after reconstruction.

Correspondence should be addressed to Mr K Deep, General Secretary CAOS UK, Dept of Orthopaedics, Golden Jubilee National Hospital, Glasgow G81 4HX, Scotland. Email: caosuk{at}gmail.com