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  • Title: Radiographic evaluation of first MTP joint arthrodesis for severe hallux valgus: Does the introduction of a lag screw improve union rates and correction of the intermetatarsal angle?
    Author: Pinter Z, Hudson P, Cone B, Motwani G, Prasad K, Shah A.
    Journal: Foot (Edinb); 2017 Dec; 33():20-24. PubMed ID: 29126037.
    Abstract:
    BACKGROUND: First metatarsophalangeal (MTP-1) joint fusion is a reliable method for the correction of various deformities including hallux valgus and hallux rigidus. Ideal constructs provide high rates of fusion in desired alignment. The present study examines the union rates, as well as the change in dorsiflexion angle during the follow up period in patients who underwent MTP-1 fusion with a dorsal locking plate and a lag screw, versus patients fused with a dorsal locking plate alone. METHODS: This is a retrospective review of 99 feet undergoing MTP-1 fusion. Joints were fused using either a dorsal locking plate alone or a lag screw plus a dorsal locking plate. Union was determined radiographically during the follow up period. Suspected nonunions were confirmed with CT. Dorsiflexion angles were radiographically measured at first post-operative visit and at final follow up. RESULTS: There were 36 patients in the lag screw plus dorsal plate group, and 63 in the dorsal plate group. Mean follow up was 12.9 months (Range: 12-33.5 months). The dorsal plate plus lag screw group had a significantly lower change in mean dorsiflexion angle (0.57°±5.01°) during the post-operative period compared to the dorsal plate group at final follow up versus the dorsal plate group (6.73°±7.07°). CONCLUSION: The addition of a lag screw to a dorsal locking plate for MTP-1 arthrodesis may offer improved stability of the joint in the sagittal plane over time compared to a dorsal plate alone. LEVEL OF EVIDENCE: Retrospective level III evidence.
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