Late Repair, One Year After a Knee Twisting Injury, of a Missed Femoral Trochlea Osteochondral Fragment, With Bioabsorbable Nails, in a 14-Year-Old Boy

The authors report a case of a late repair of a missed, large, osteochondral fracture of the femoral trochlea in a 14-year-old boy due to lateral patellar dislocation after a twisting injury of the knee a year ago. The late—1 year after the knee injury—imaging assessment of the patient regarding radiograph images, CT scan, and MRI was misleading, misinterpreted, and failed to reveal this osteochondral fracture. The free osteochondral fragment was detected during diagnostic arthroscopy. Open reduction and fixation of the osteochondral fragment with bioabsorbable pins were done, and healing was achieved within an acceptable time. The patient's clinical and imaging examination with knee MRI, a year after the surgical treatment, was highly satisfactory. Fixation with bioabsorbable pins showed to be a worthwhile option in this case. The technique used was straightforward, with excellent short- and long-term results. Bioabsorbable pins may be used to restore successfully even an old, large osteochondral fracture in the immature skeleton.