Traumatic hip dislocation is a relatively rare entity in children. Posterior cruciate ligament (PCL) avulsion is also veryrare in children and only a few cases have been reported.Because of the mechanism of injury, coexistent PCL avulsion with posterior dislocation of the hip is frequently seenin adults. This coexistence, however, has not hitherto beenreported in children. We present an eight-year-old boy withtraumatic posterior dislocation of hip and PCL avulsion. Hewas brought to hospital after a car accident in which his kneehit to the front part of the car when he was driving a bicycle.He had limitation of motion in the left hip with adduction andflexion deformity and a mild swelling and ecchymosis on thepopliteal fossa of the left knee. Pelvic X-ray showed posteriordislocation of the left hip. Closed reduction was performedunder general anesthesia. Six weeks later, he presented againwith a complaint of limitation of motion in the left knee. Ona knee radiograph, an avulsed bony fragment was noted nearthe medial femoral condyle. Three-dimensional computedtomography with reconstruction showed avulsion of a 0.5-cmfragment from the medial femoral condyle. Because of delay,no surgical intervention was attempted and he received physical therapy for quadriceps strengthening and improvement inthe range of motion of the knee. One month after physicaltherapy, he had 120 degrees of knee flexion with no flexioncontracture. Twelve months after injury, the patient had a normal hip and near-full knee flexion. He had no rotary instability and was active in sport.