Purpose: Treatment of recent lesions of the posterior cruciate ligament (PCL) is not standardised. Decisions depend on the patients age and activity level, the degree of laxity, and the presence of combined lesions. Surgical solutions included PCL repair with suture, reconstruction with an autograft or allograft, or synthetic plasty. The purpose of this study was to analyse the results of synthetic reconstruction plasty for knees with important recent laxity of the PCL alone or in association with other lesions (triads, pentades, dislocations). We hypothesised that the synthetic ligament serves as a tutor guiding healing of the ruptured ligament.

Material and methods: The series included 14 consecutive patients, 1 women, 13 men, mean age 27 years who were reviewed retrospectively. These patients were treated for isolated PCL tears (laxity > 15 mm) (n=3), PCL tears combined with laxity (medial or lateral) (n=6) or dislocation (n=5). Mean posterior laxity was 24 mm. The operation was performed 3 to 50 days after trauma using the LARS method (polyester ligament, 6 or 8 mm, 1 or 2 strands). All associated lesions were repaired during the same procedure except one A CL and one posterolateral angle which were treated secondarily. Mean follow-up was 36 months (10–88). All patients were seen for consultation except one who responded to a questionnaire. The IKDC score and Telos laxity measurements were noted.

Results: In five knees, stiffness required mobilisation or arthroscopic arthrolysis. A secondary tear confirmed arthroscopically occurred in one case after a new trauma. Subjectively, two patients were very satisfied, eight were satisfied and three were disappointed. Final motion was: 6/0/130. Direct clinical posterior drawer was present in twelve cases: the Telos differential was 8 mm (24 mm preoperatively). The overall IKDC score was A=0, B=7, C=3, D=2. Persistent posterior laxity was the worst item. Outcome was less satisfactory for all items for posterolateral laxity. There was no difference between the one- and two-strand plasties.

Discussion: We did not have any complications directly related to the synthetic ligament (synovitis, spontaneous tear). There was a significant gain in posterior laxity. Outcome depended on associated lesions, particularly lateral lesions (stiffness, IKDC score), rather than the surgical technique used to repair the PCL. The synthetic ligament appears to play its role as a tutor, a single strand measuring 6 mm in diameter is sufficient.

Conclusion: This technique spares the tendon stock and can be proposed for recent tears of the PCL with major laxity. A longer term follow-up is needed to confirm the persistence of the improvement in laxity.