Abstract: Knee joint laxity testing apparatus configured to measure knee laxity in three planes of motion includes a foot and ankle stabilization assembly including a foot plate, a heel clamp and a tibial clamp for securing a foot and an ankle of a person, an anterior-posterior (AP) loading assembly configured to apply an anterior/posterior loading on a knee of the person, and a thigh stabilization assembly including a proximal thigh fixation module and a distal thigh fixation module. The proximal thigh fixation module includes a thigh cradle and a pair of clamping arms for securing a thigh positioned on the thigh cradle. Each clamping arm is pivotable about a hinge. The distal thigh fixation module is operable to firmly hold a distal portion of a thigh of the person in place while a leg of the person is manipulated.

Abstract: Knee joint laxity testing apparatus includes a thigh cradle assembly, a shank cradle assembly, and a heel cradle assembly. The apparatus is configured to measure knee laxity in three planes of motion: anterior-posterior translations; varus-valgus rotations; and internal-external rotations. The thigh cradle assembly, shank cradle assembly, and heel cradle assembly are mounted on a common base. A thigh fixation system is attached to the thigh cradle assembly both at the proximal and distal ends to firmly stabilize the thigh in the thigh cradle. The patella pad and distal thigh fixation system are mounted on a U-bar assembly. The distal thigh fixation system includes two condyle pad adjustment arms upon which a respective condyle pad is mounted, and a patella pad mounted to a linear track on an underside of the U-bar assembly.