A new mechanical testing device for measuring anteroposterior knee laxity

Am J Sports Med. Oct-Nov 2004;32(7):1731-5. doi: 10.1177/0363546504267050.

Abstract

Background: The authors assessed a new instrument, the Rolimeter, for the measurement of anteroposterior translation in the knee; it was compared to the KT-1000 arthrometer.

Purpose: To determine if the Rolimeter offers a valid method for the measurement of anteroposterior translation that is as reproducible and reliable as the KT-1000 arthrometer.

Methods: Two of 3 observers examined 16 normal subjects (32 knees) and 36 patients (72 knees) with ligament ruptures twice, using both the Rolimeter and the KT-1000 arthrometers, 30 minutes apart. Total anteroposterior translation (manual maximal Lachman test) was recorded at 20 degrees and 80 degrees of knee flexion.

Results: On average, the Rolimeter measured approximately 1 mm less anteroposterior displacement than the KT-1000 arthrometer at manual maximum stress. Rolimeter measurements were more consistent than the KT-1000 measurements as measured by our observers. Specificity and sensitivity were equivalent between the Rolimeter and the KT-1000 arthrometer.

Conclusions: The Rolimeter is as reproducible and reliable as the KT-1000 arthrometer. It offers a valid method for the measurement of anteroposterior translation in the knee. Higher accuracy was obtained at 20 degrees of flexion for the KT-1000 arthrometer and at 80 degrees of flexion for the Rolimeter.

Publication types

  • Clinical Trial

MeSH terms

  • Anterior Cruciate Ligament Injuries*
  • Biomechanical Phenomena
  • Humans
  • Joint Instability*
  • Knee Injuries / diagnosis*
  • Knee Joint / physiology*
  • Orthopedics / methods
  • Posterior Cruciate Ligament / injuries*
  • Reproducibility of Results
  • Sensitivity and Specificity