Treatment of Posterior Cruciate Ligament Tibial Avulsion Fractures Through a Modified Open Posterior Approach: Operative Technique and 12- to 48-Month Outcomes

OBJECTIVES:To report clinical and functional outcomes following fixation of tibial posterior cruciate ligament (PCL) avulsion fractures through a modified open posterior approach when combined with a rehabilitation program emphasizing early range of motion. DESIGN:Retrospective case series. SETTING:Level I trauma center. PATIENTS:From March 4, 2000 to May 8, 2003, there were 16 cases of PCL tibial avulsion injuries presented to our institution, with 10 patients available for follow up at 12 to 48 months (mean 28 months). INTERVENTION:Fixation of tibial PCL avulsion fractures was with a lag screw and washer placed through a modified open posterior approach. Range of motion was begun on postoperative day 1. MAIN OUTCOME MEASUREMENTS:Clinical stability, range of motion, gastrocnemius muscle strength, radiographic appearance, and each patientʼs overall health-related quality of life (using the musculoskeletal functional assessment tool) were evaluated at final follow up. RESULTS:The average musculoskeletal functional assessment score was 14. (Musculoskeletal functional assessment scores range from 0-100, with higher scores indicating poorer function.) All patients achieved union of their fracture and had clinically stable knees at the latest follow-up. Flexion difference greater than 10 degrees (P = 0.16), extension difference greater than 2 degrees (P = 0.38), and heel raise difference more than 8 repetitions (P = 0.23) were not demonstrated in comparison to the normal side. CONCLUSIONS:Treatment of tibial PCL avulsion fractures, which includes fixation through a modified open posterior approach and early postoperative range of motion, results in healing of the fracture, good functional outcomes, stability to posterior draw testing, and does not lead to gastrocnemius weakness or significant range of motion deficits at 12 to 48 months postoperatively.