Purpose : To evaluate the diagnostic accuracy of MR imaging in posterior cruciate ligament(PCL) injuries, todescribe the variety of these injuries and to assess the type and frequency of associated knee injuries. Materialsand Methods : We retrospetively analysed 75 cases with knee injuries. In all cases, the prescence of a PCL tearwas determined by arthroscopy or surgery and the type of tear and patterns of associated knee injuries weredescribed. Results : Twenty-eight PCL tears were identified with arthroscopy or surgery. Figures for thesensitivity, specificity, and accuracy of MR diagnosis for the PCL injury were 86%, 94% and 91% respectively.Twenty-one cases(75%) had complete PCL tears and seven (25%) had partial tears. The commonest tear site wasmidsubstance(18 cases, 64.3%). Twenty-seven cases(96%) had associated knee injuries ; the remaining patient(4%)had isolated PCL injuries. There were 19 cases(68%) of ligamentous injuries, ten (36%) of meniscal tear, ten (36%)of bony injuries, and 20 (71%) of joint effusions. Of the ligamentous injuries, those involving the medialcollateral ligament were most often seen(10 cases, 36%). Conclusions : MR imaging is an accurate method for thedetection and evaluation of PCL injury and associated knee abnormalities.