51-year-old female status post ACL reconstruction x 2 with positive Lachman's and knee pain.IMAGE ACQUISITIONS: Computed tomography of the right knee, nonenhanced, with transverse, coronal, and sagittal reformatted images As stated on the requisition, the patient is status post reconstruction of the anterior cruciate ligament as evidenced by surgical tunnels in the proximal tibia and distal femur. Although not visible on this study, the graft appears intact on the recent MRI examination. As seen on prior radiographs, there is a horizontally oriented fixation screw within the posterior aspect of the lateral femoral condyle at the superior margin of the femoral tunnel. Its pin exits the posterior femoral cortex and extends superomedially such that its tip lies immediately anterior to the popliteal artery. A small tapering focus of low to intermediate attenuation is seen immediately inferior to the pin, which may either represent a ganglion or focus of scarring; I do not believe that it is vascular in etiology.The tibial tunnel penetrates the anteromedial cortex of the proximal tibia. Additional lucent tracts are seen in the distal femur and proximal tibia compatible with more remote ACL reconstruction.Tiny patellar osteophytes indicate mild osteoarthritis. The remaining visualized bone and soft tissue structures are within normal limits.
Postoperative changes as described above.