Fig. 1From: Gradual loaded exercise of knee extension muscles using an orthosis after wide resection of a femoral sarcoma and quadriceps muscle: a case reportPreoperative physical condition a and magnetic resonance imaging scans b of the femur. a Left medial femur with a tumour mass. b Soft tissue mass with internal heterogeneity, cystic degeneration, and fluid–fluid level. M medial, L lateral, T1 T1-weighted images, T2 T2-weighted images, Cor coronal, Ax axialBack to article page