Knee pain caused by a fiducial marker in the medial femoral condyle - A clinical and anatomic study of 20 cases

After 2-pin-based ROBODOC hip arthroplasty procedures, 10 of 18 patients re ported persistent severe pain at the site of pin implantation in the medial femoral condyle. In a cadaver study, we found that the infrapatellar branc h of the saphenous; nerve, the saphenous nerve and the anterior cutaneous b ranches of the femoral nerve had been injured by the pins. At least one of these nerves was injured in 11 of the 20 specimens examined. Our findings i ndicate that the knee-pain may be partly caused by injuries to these nerves .