Fig. 4

a and b show typical measurements of CSA and fatty atrophy of the TFLM before and after surgery in group a. Measurements for group b are shown in c and d. Photographs of the TFLM after arthroplasty corresponding to the left MRI image are shown in e and f. The TFLM was protected with the capsule pad as shown in c. In group b, evidence of substantial damage to the TFLM is shown