ObjectiveTo discuss the imaging manifestations of ulnar impaction syndrome, and to evaluate the diagnostic value of MR imaging. MethodsThe clinical data of 18 patients with clinical standard-proved ulnar impaction syndrome between January 2010 and June 2013 were retrospectively reviewed. ResultsSeventeen cases were diagnosed as ulna positive variation (94.6%), and the range of ulnar variance was 1.5 to 3.8 mm and the average ulnar variance was 2.6 mm. Neutral variance was found in one case. Fourteen cases had avascular necrosis or bone sclerosis of semilunar bone, and avascular necrosis or bone sclerosis of the triquetrum and ulnar was presented in 12 cases and 3 cases respectively on X-ray detection. CT scan showed that 16 cases of semilunar bone abnormalities (6 with ischemic necrosis), triquetrum osteonecrosis in 4 cases, and both necrosis of semilunar bone and triquetrum in 3 cases. On MRI, all cases had different degrees of damage, degeneration of semilunar bone, triquetrum, ulnar and triangular fibocartilage complex (ulnar side of the proximal end of the lunate in 18, radial side of the triquetrum in 17, distal joint surface of ulnar in 12, and triangular fibocartilage complex in 15). In the early stage, lesions were presented as edema of bone marrow and followed as different sizes of cystic change. Articular surface was collapsed later. ConclusionUlnar positive variance has important reference value in the diagnosis of ulnar impaction syndrome. MRI can show the early change of ulnar impaction syndrome, and provide reliable decision basis for clinical diagnosis and treatment.
ObjectiveTo investigate the value and feasibility of low-field MR in the diagnosis of excessive lateral pressure syndrome (ELPS) of the patellofemoral joint. MethodsThirty-seven patients confirmed to have ELPS by surgery or clinical examination between March 2010 and March 2013 were involved in this retrospective study. The injured knees of all patients were examined by SE sequence and Fat sequence, using Siemens 0.35 T MR scanner. The patella was assessed. Infrapatellar fat pad, patella tilt angle and patellofemoral joint space were measured. ResultsThere were 15 cases of type Ⅱ, 21 of type Ⅲ, and 1 of type Ⅳ knees. Three cases of bipartite were detected. Patella tilt angle: type Ⅳ > type Ⅲ > type Ⅱ. Infrapatellar fat pad had edema in 37 cases. And there were 29 cases of varying degrees of lateral patellar cartilage softening. ConclusionLow-field MRI is an effective diagnostic method of excessive lateral pressure syndrome for patellofemoral joint. STIR sequence is the best sequence for diagnosing patellofemoral excessive lateral pressure syndrome.