Digitized serial CAT scans of four non-embalmed cadaver knees were used in the computer-aided determination of the longitudinal (internal-external) centres of rotation. The mean and standard deviation of the centre of rotation locations were calculated both before and after sectioning the anterior cruciate ligament. Regardless of anterior cruciate ligament status, the mean location of the centre of rotation was on the tibial spine, slightly anterior to the origin of the posterior cruciate ligament. However, upon sectioning of the anterior cruciate ligament, the standard deviation of the centre of rotation location increased markedly in the latero-medial direction in three of the four legs tested.
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