PROBLEM TO BE SOLVED: To provide a knee joint rotation analyzer capable of quantitatively evaluating instability of the knee joint rotation.SOLUTION: The knee joint rotation analyzer includes means of: acquiring variations in bending angles and external rotation angles of the knees of a subject in bending and extension in a pivot shift test acquiring differences between variations in the external rotation in the bending and variations in the external rotation angle in the extension in the same bending angle, and acquiring a first evaluation value from a total of the differences acquired of the respective bending angles and acquiring a second evaluation value from a difference between the first evaluation value acquired on the left knee of the subject and the first evaluation value acquired on the right knee of the subject.SELECTED DRAWING: Figure 1
