Coronal plane knee laxity measurement: Is computer-assisted navigation useful? - 18/06/10
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Summary |
Introduction |
The goal of this observational study is to measure the physiological laxity of a knee, supposedly normal in the coronal plane, at 0 and 90° of flexion with a navigation system that can be used during total knee replacement.
Hypothesis |
The physiological laxity measured by this navigation system is different from the results already published using other measurement devices.
Materials and methods |
Twenty patients consecutively operated on for an isolated anterior cruciate ligament injury were selected. Medial and lateral laxities at 0 and 90° of knee flexion were measured by the navigation system during cruciate replacement.
Results |
The mean medial laxity in extension was 3.6±1.2°. The mean lateral laxity in extension was 4.1±1.9°. The mean medial laxity at 90° of flexion was 2.1±1.2°. The mean lateral laxity at 90° of flexion was 3.7±1.2°. The medial and lateral laxities in extension were not asymmetric. The medial and lateral laxities at 90° of flexion were asymmetric. Medial laxities in extension and at 90° of flexion were asymmetric. Lateral laxities in extension and at 90° of flexion were not asymmetric.
Discussion |
The data collected in our study suggest, during total knee replacement, the following tolerable ligamentous balance: medial and lateral laxities in extension about 3°, medial laxity at 90° of flexion about 2°, and lateral laxity at 90° of flexion about 4°.
Level of evidence |
Level IV. Prospective study.
Le texte complet de cet article est disponible en PDF.Keywords : Knee, Ligamentous balance, Coronal plane laxity, Navigation
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