An analysis of normative data on the knee rotatory profile and the usefulness of the Rotatometer, a new instrument for measuring tibiofemoral rotation: the reliability of the knee Rotatometer.

Purpose: This study proposes a simple and noninvasive instrument called the "Rotatometer" to measure tibiofemoral rotation and investigates its clinical applicability to the assessment of static rotational knee laxity.

Methods: The degree of tibiofemoral rotation was measured for a sample of 94 healthy volunteers with 188 knees by using the Rotatometer. The measurement was made by two independent and blinded examiners in three sessions at one-month intervals.

Comparison of clinical results of anatomic posterolateral corner reconstruction for posterolateral rotatory instability of the knee with or without popliteal tendon reconstruction.

Background: It is unknown whether popliteal tendon reconstruction is necessary in anatomic posterolateral corner reconstruction, although the tendon has function in the varus and rotatory stability of the knee joint.

Hypothesis: Anatomic reconstructions of the posterolateral corner with the popliteal tendon reconstructed will present better clinical and radiographic results than cases with the popliteal tendon not reconstructed.

Study Design: Cohort study; Level of evidence, 3.