Multi-detector CT Findings in Lisfranc Injury and the Clinic Values

Objective: To investigate the features of the multi-detector CT in Lisfranc injury and its clinical value. Materials and Methods: 31 patients whose clinical manifestation were consistent with Lisfranc injury were included in this study. 21 cases were injured by traffic accidents, 8 cases were by falling, and 2 cases were mangled injury. All patients underwent foot anteroposterior and oblique position X-ray plain film immediately, and 3 patients were underwent foot lateral position X-ray plain film. MDCT scan were performed within 3 days. The raw data of CT scan were reconstructed with the VR(valume rendering) and MPR(multiplanar reconstruction). Results: Fractures and dislocation of tarsometatarsal joint were detected by CT in 31 cases. 89 fractures were detected, the fracture occurred in one part in 3cases, in two parts in 13 cases, and more than 3 parts in 15 cases. 57 dislocationhs were detected, the dislocation ≤ 2 mm was occurred in 9 parts, > 2~5 mm in 30 parts, and > 5 mm in 18 parts. Dislocation occurred when fracture line involved the articular facet. Compare with CT scan, the missed diagnosing rate of X-ray plain film is 14.61% in fracture and 25.56% in dislocation. Conclution: CT features of Lisfranc injury include fracture and dislocation of tarsometatarsal joint. Fracture line involved the articular facet indicats ligaments injure. CT features of Lisfranc injury is valuable to the choice of its treatment.