Abstract
Introduction: Tarsometatarsal joint (TMTJ) fusion is performed for arthritis or painful deformity. First TMTJ fusion may be performed as a part of corrective surgery for hallux valgus deformity. K-wires and trans-articular screws are often used to stabilize the joints. We present our experience with the use of locking plates (LP) for TMTJ fusion.
Patients and Methods: Thirty-three TMTJ’s in 19 patients were fused and stabilised with LP’s between January and September 2008. The procedure was performed for Lisfranc arthritis in 13 patients and Lapidus procedures in six. Two out of 6 were revisions after failed fusion using transarticular screws. Iliac crest bone autograft was used in 26 joints in 12 patients. All patients post-operatively had below knee plaster immobilization and protected weight bearing walking for first 6 weeks. Clinical and radiological surveillance continued until bone union. AOFAS midfoot scale was used as outcome measure.
Results: There were 7 male and 12 female patients with average age of 51 (14–68). The American orthopaedic foot and ankle surgery society (AOFAS) midfoot score showed a 42% improvement in pain, 30% improvement in function and 53% improvement in alignment. The average AOFAS overall score improved from 30 preoperativley to 67 postoperativley. All except one joint in one patient had clinically and radiologically fused joints. One patient underwent removal of the metalwork and four had delayed wound healing. The average satisfaction score was 7 out of 10. 86% said of patients said that they would recommend the surgery to a friend, and 91% would undergo the surgery again.
Discussion: Locking plates have been recently introduced for ankle and foot surgery. Biomechanical studies have shown that the plates are not as strong or stiff as trans-articular screw fixation, however, they are easy to use, have more flexibility for realignment and can act as a buttress for bone graft. In our series all, except one, patients achieved bony union without loss of alignment.
Conclusion: Locking plates provide satisfactory stability for TMTJ fusion, without complications.
Correspondence should be addressed to: Mr Andrew H. N. Robinson, Editorial Secretary, Department of Trauma and Orthopaedics, BOX 37, Addenbrooke’s Hospital, Cambridge CB2 2QQ, England.
