The Application Study Of Magnetic Resonance Imaging In Knee Surgery

1. Radiographic imaging study of the correlation between subchondral bone marrow edema and pain in knee osteoarthritisObjective: To evaluate whether the presence of subchondral bone marrow edema (BME), detected by magnetic resonance imaging (MRI), are associated with the different levels of pain among patients suffering osteoarthritis of the knee .Methods: Based on rating scale of pain, 264 patients with knee osteoarthritis were divided into three groups: no pain group, 47; mild pain group,184; moderate or severe pain group,33. Contingency table analyses and rank sum tests were used to compare the difference of OA stage and BME score among these groups. OA was defined by a Kellgren-Lawrence (K-L) score of 2 or greater (mild, K-L 2 score,52; moderate, K-L 3 score,142; severe, K-L 4 score,70), while BME was identified from MRI (0 grade, no BME,69; 1 grade, small BME,127; 2 grade, large BME,68).Results: 46.8% (22/47) of OA patients in no pain group had BME, while in mild pain group the percentage was 79.7% (173/217), in severe pain group 90.9%(30/33) .Contingency table analyses were used to compare the difference of OA stage and the difference of pain among these groups. The results showed that there were no statistical significance of OA stage among three pain groups (X2 =5.251, P=0.263), though severe OA were more likely to occur in moderate or severe pain group as compared with the no pain and mild pain groups (42.4% vs. 23.4% and 24.5% ). The results of rank sum tests for several independent samples showed that there were no significant difference of OA stage among the three pain groups(p=0.152).