After a patellar fracture occurs, through immobilization or surgical treatment, it's possible to actively contract the quadriceps early on to strengthen muscle exercise and avoid muscle atrophy. Ankle pump exercises can also be performed, which are beneficial for the contraction of the calf muscles in the lower limbs, can help prevent thrombosis, and aid in the recovery of function. After the removal of external fixation or once the wound has healed, one can actively flex the knee joint. For example, by sitting at the edge of the bed with the knee naturally hanging, the knee joint can be flexed to 90 degrees. If there is difficulty in bending, one can push the healthy limb backward against the injured limb to help bend the knee joint. For exercises exceeding 90 degrees, one can lie flat on the bed, then flex the hip joint while holding the thigh of the injured limb with both hands, and allow the knee joint to naturally bend through gravity. This exercise can help restore the flexion and extension functions of the knee joint.