Reliability of lnstrumentation and Measurement Procedures for Active Internal and External Tibial Rotation.

Active internal and external tibial rotation were measured as independent motions from a neutral starting position. This study determined the reliability of a new instrument and measurement procedure designed to measure tibial rotation. Reliability coefficients for internal and external tibial rotation were 0.93 and 0.8 1, respectively. It was concluded that 1) a neutral rotary position can be established from which to measure internal and external rotation, and 2) internal and external tibial rotation can be measured reliably.J Orthop Sports Phys Ther 1983;4(3):154-157.