Force plate Forward dynamics Gait A transducer that is set in the floor to measure about some specified point, the force and torque applied by the foot to the ground. These devices provide measures of the three components of the resultant ground reaction force vector and the three components of the resultant torque vector. Analysis to determine the motion of a mechanical system, given the topology of how bodies are connected, the applied forces and torques, the mass properties, and the initial condition of all degrees of freedom. A manner of walking or moving on foot. Generalized coordinates High tibial osteotomy (HTO) Hip abduction-adduction Hip flexion-extension Hip internal-external rotation Hip motion Inferior A set of coordinates (or parameters) that uniquely describes the geometric position and orientation of a body or system of bodies. Any set of coordinates that are used to describe the motion of a physical system. Surgical procedure that involves adding or removing a wedge of bone to or from the tibia and changing the frontal plane limb alignment. The realignment shifts the weight-bearing axis from the diseased medial compartment to the healthy lateral compartment of the knee. Motion of a long axis of the thigh within the coronal plane as seen by an observer positioned along the anterior-posterior axis of the pelvis. Motion of the long axis of the thigh within the sagittal plane as seen by an observer positioned along the medial-lateral axis of the pelvis. Motion of the medial-lateral axis of the thigh with respect to the medial-lateral axis of the pelvis within the transverse plane as seen by an observer positioned along the longitudinal axis of the thigh. The hip angles reflect the motion of the thigh segment relative to the pelvis. Below or at a lower level (towards the feet).