Abstract
Arthrodesis of the first tarsometatarsal joint (TMT1) reduces pathologic angles at the anatomic center of rotation of angulation and presents a substantial correction potential in 3 planes in the treatment of hallux abductovalgus. The optimal fixation method remains unclear since prevailing dorsomedial locking plates and/or compression screws depict elevated implant-associated complications. Medical records of 49 patients that underwent 53 TMT1 arthrodeses in hallux abductovalgus interventions were included. Median average visual analog scale scores decreased (p < .001) from 6.8 (range 4-10) to 2.7 (range 0-10), first intermetatarsal angles were reduced (p < .001) from 17.39° (range 12°-28°) to 7.16° (range 3°-12°), standing lateral first metatarsal angles improved (p < .001) from 21.66° (range 12°-29°) to 23.94° (range 14°-31°) and tibial sesamoid positions were plantarized (p < .001) from 6.02° (range 4°-7°) to 2.79° (range 1°-6°). Plantar plating allowed immediate weightbearing with transition to normal shoe gear at 6 weeks. Complications occurred in 6 (11.34%) feet including 1 (1.89%) nonunion, 1 (1.89%) delayed union, 1 (1.89%) hallux varus, 1 (1.89%) incomplete recurrence, 1 (1.89%) minor dehiscence, and 1 (1.89%) hardware irritation. Plantar locking plates combined with a dorsal compression screw presented a favorable tension-side implant location that closed the fusion site under load. This facilitated substantial reductions in complications, pathologic angles, and pain.
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