October 1, 1990Journal of Bone and Joint Surgery
Arthrometric evaluation of knees that have a torn anterior cruciate ligament.
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Discussion
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Implication
Diagnostic study reveals high sensitivity and specificity for maximum manual arthrometry in anterior cruciate ligament tears, highlighting its utility for injury detection.
Key Points
- To determine the diagnostic efficacy and accuracy of KT-1000 arthrometer measurements in detecting acute and chronic anterior cruciate ligament tears compared to healthy controls.
- Evaluated 401 individuals, including 107 patients with acute anterior cruciate ligament tears, 153 patients with chronic tears, and 141 healthy control subjects.
- Measured anterior translation using the KT-1000 arthrometer across three parameters: 89 N of force, maximum manual force, and the compliance index, comparing involved and uninvolved knees.
- At maximum manual force, translation was 10 mm or less in 98.6% (139/141) of controls versus 20% of patients with acute or chronic tears (p < 0.001).
- The maximum manual force test was the strongest discriminant, differentiating normal from abnormal knees with 92% sensitivity and 95% specificity at a cut-off point of 11 mm or less (p < 0.001).
- Significant differences in translation were observed between the uninjured knees of injured patients and the knees of healthy controls (p < 0.001 to 0.006), with no relationship between injury-to-operation time and translation in chronic tears.
Cite This Study
Bach et al. (1990) studied this question.