Assessment of Anterolateral Rotatory Instability in the Anterior Cruciate Ligament–Deficient Knee Using an Open Magnetic Resonance Imaging System
2007
BackgroundIn the clinical evaluation of the anterior cruciate ligament—deficient knee, anterolateral rotatory instability is assessed by manual tests such as the pivot-shift test, which is subjective and not quantitative.HypothesisThe anterolateral rotatory instability in an anterior cruciate ligament—deficient knee can be quantified by our newly developed method using open magnetic resonance imaging.Study DesignControlled laboratory study.MethodsEighteen subjects with anterior cruciate ligament—deficient knees and 18 with normal knees were recruited. We administered the Slocum anterolateral rotatory instability test in the open magnetic resonance imaging scanner and scanned the sagittal view of the knee. The anterior displacements of the tibia at the medial and lateral compartments were measured. Furthermore, we examined 14 anterior cruciate ligament—deficient knees twice to assess intraobserver and interobserver reproducibility and evaluated the difference and interclass correlation coefficient of 2 mea...
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