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KT-1000 arthrometer: Conscious and unconscious test results using 15, 20, and 30 pounds of force

Orthopaedic Consultants, Dallas, Texas

Allen W. Jackson, EdD

University of North Texas, Denton, Texas

Ken A. Jansson, MD

Orthopaedic and Reconstructive Surgery, Emporia, Kansas

Neil B. Meske, MS, LPT

Orthopaedic Consultants, Dallas, Texas

A recent published report indicated that the reliability and validity of anterior laxity measurements obtained by using the KT-1000 arthrometer were questionable. The purpose of our study was to examine the diagnos tic validity of anterior laxity measurements testing pa tients in conscious and unconscious states using the KT-1000 arthrometer at 15, 20, and 30 pounds of force. The sample included 68 patients with confirmed ante rior cruciate ligament disruption. They were given an terior-posterior drawer tests at 20° in both unconscious and conscious states; measurements were recorded at 15, 20, and 30 pounds of force. The results indicated that the measurements in the unconscious state were significantly higher (P < 0.01) than the values obtained in the conscious state. The anterior cruciate ligament- disrupted knees produced significantly higher (P < 0.01) anterior laxity. The difference between anterior cruciate ligament-disrupted knees and normal knees grew sig nificantly larger (P < 0.01) as force increased. More patients demonstrated a difference >2 mm between anterior cruciate ligament-disrupted knees and normal knees at 30 pounds (81 % to 83%) than at 20 pounds (64% to 72%) of force. Seventy-nine percent of the patients demonstrated a compliance index difference >1 mm using 15 and 30 pounds between the normal and anterior cruciate ligament-disrupted knee. These data provide statistical validity for the compliance index and support for the use of anterior laxity measurements at 30 pounds of force. However, approximately 20% of these patients did not demonstrate an anterior cruciate ligament-disrupted-normal knee difference >2 mm or a compliance index difference of >1 mm.

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