Value Of 3.0T MRI For Case Selection In Unicompartmental Knee Replacement

Objective:To investigate the feasibility in Unicompartmental Knee Replacement(UKA) of the mild cartilage degeneration of lateral compartment with knee osteoarthritis, and using 3.0T MRI for case selection in UKA.Methods:From November 2013 to May 2015, there were 60 patients gotten weight-bearing knee joint X-ray film in preoperative, and grouping according to the results of the KellgrenLawrence: the Part A was that the cartilage degeneration of medial compartment was ?3 level. Anterior cruciate ligament was intact. The cartilage of others compartments was intact. We took the UKA to the Part A. The Part B was that the cartilage degeneration of medial compartment was ?3. The cartilage degeneration of lateral compartment was 1 level. All of the Part B got the knee joint 3.0T MRI and grouping according to the results of the Recht and the grading of articular ligament injury in American Medical Association. The Part B1 was that the cartilage degeneration of medial compartment is ?III level. The cartilage degeneration of lateral compartment is I~II level., and the ligament was intact. The rest were Part B2. We did the operation of UKA for the Prat B1 and the operation of the total knee replacement for the Part B2. The Part A and Part B1 were follow-up 3 to 18 months(an average of 9.8 months). Through the preoperative and postoperative KSS evaluated the clinical curative effect.Results:There were 43 patients who were gotten UKA. Paired sample t test was performed on the KSS score of the A group and the B1 group at the end of the follow-up.Two groups have statistical difference. Homogeneity of variance test was performed on two groups of patients with pain score at the last follow-up(F=2.770,Sig=0.102), and missing variance with Dunnettt methodand, and had not significant differences among two groups(t'=0.045, P=0.964>0.05). Homogeneity of variance test was performed on two groups of patients with function score at the last follow-up(F=1.102, Sig=0.299), and missing variance with Dunnett-t methodand, and had not significant differences among two groups(t'=0.845, P=0.402>0.05).Conclusions:1. It is meaningful of 3.0T MRI for case selection in UKA.2. The I to II level cartilage degeneration of the lateral compartment with knee osteoarthritis is not effect to UKA in the short-time.