Ace the California SIP Exam 2026 – Secure Your Self-Insurance Success!

In rating knee disability, three core areas determine impairment: loss of motion, instability, and muscle wasting around the thigh. First, limitation of flexion and extension reflects the knee’s range-of-motion deficits. Second, instability represents ligamentous laxity or giving-way of the knee. Third, thigh atrophy indicates quadriceps wasting that can worsen knee function.

Other options bring in calf atrophy or adduction/abduction, which are not standard elements used for knee impairment rating. Therefore, the best choice lists limitation of flexion and extension, instability, and thigh atrophy.