Posterolateral dislocation of the knee joints：analysis of 9 case

Objective:To analyze the rtraumatie pathologieal characteristics of posterolateral dislocation of knee joins and its treatment.Methods:Mine cases of posterolateral dislocation of knee joint,5 cases of fresh injuries(the fresh injury group)and 4 cases of old injuries (the old injury group)were reviewed and analyzed.In the fresh injury group 4 cases failed in close reduction due to “buttonholing”through the medial joint,among them 3 case underwent repair of the damaged ligantents.In the old injury group 2 cases underwant ACL and MCL repair only in acuts stage,but re-dislocated.Of the rest 2 case 1 was associated with peroneal nerve injury and the other was not treated of the tibiul condyle and popllteal artery injury.Open reduction was performed in 3 enses.One case was fixed with 2-crossed pin and another was fixed with one pin through the tibial and femoral condyle and second pin with olecranization fixation.Plester immobilization for 6.8 weeks respectively was required.In the old injury group in 1 case ACL and PCL repair(Augustine method) and posterolateral structure were performed and olecranization fixation and plaster immobilization for 6 weeks was needed.Arthrodesis of the knee was done for the patient with comminuted fracture of the tibial condyte and popliteal artery injury.Results:All the cases were followed up for 1-23 years(average 6 years).Knee stabllity in 4 cases with repair of the ligaments was improved,although PDT showed (+) with different was improved,although the patients treated with ligamentous reconstruction were much better than those of the patients without any repair. Conclusions:Well understanding of the tranmatic pathological characteristics,repair of the damaged postoperative immobilization for 6 weeks are the key points of successful treatment.