The Treatment of Combined Injury of Posterior Cruciate Ligament & Medial Collateral Ligament: Result of Treatment (MCL Stability depends on PCL Status)

Seo, Seung Suk; Gwak, Heui Chul

Abstract

PURPOSE: The purpose of this study is to evaluate the results of treatment of combined injury of PCL and MCL and to analysis the factors affecting the MCL stability.
MATERIALS AND METHODS
The 10 patients of combined injury of posterior cruciate ligament and medial collateral ligament was evaluated after an average duration of follow up of 62.3 months. The age of the patients at the time of injury had twenty five to fifty five years (average 33.6 years) Posterior cruciate ligament were treated reconstructed (7 case) or repaired (3 case) Medial collateral ligament were treated repaired (8 case) or nonoperatively (2 case) Postoperatively, all knees had been immobilized for 5~6weeks in 30degrees flexion with a plaster of cast.
RESULTS
Lysholm knee score were revealed Excellent (2), good (2). fair (3) poor (3). IKDC knee evaluation form were classified A (2), B (2), C (4), D (2). Materials were grouped according to posterior laxity on the stress x-ray. Group I- less than 5mm posterior translation (4case), Group II- more than 6 mm pos-terior translation (6 case). MCL laxity were average 1.6 m in group I and 3.0 mm in group II (P=0.05). The MCL laxity of PCL repair group was 2.5 mm and that of PCL reconstruction group was 2.4 mm (P>0.05). The MCL laxity of MCL non-operative group was 2.8 mm and that of MCL repair group was 2.4 mm (P>0.05).
CONCLUSION
Laxity of medial collateral ligament was more related to the PCL laxity than method of treatment PCL and MCL on combined injury of PCL and MCL. To obtain the excellent medial stability on the combined injury of MCL and PCL needs a more sophisticated PCL reconstruction.