Fig. 5

Method of pre-operative measurement of the harvesting area for bone-patella-tendon autograft. a Axial MRI of the right knee of a young male with anterior cruciate ligament (ACL) injury. Measurement of the distance from the mid-patella (c) to the central-ridge (d). b During the surgical procedure, the distance from the mid-patella to the central-ridge was measured (c, d). The new harvesting area (black dashed line) was shifted from the previous mid-patella area (red dashed line)