Alteration in First-Tarsometatarsal Joint Alignment After Fi
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The first-tarsometatarsal (TMT) joint's instability has been suggested as a cause of hallux valgus. The aim of this analysis was to see if hallux valgus correction affects first-TMT alignment and congruency. Improvement in alignment will show that hallux valgus leads to TMT instability in the first place.

Radiographs of patients who underwent first-MTP joint arthrodesis for hallux valgus were retrospectively reviewed. The HVA, 1-2 intermetatarsal angle (IMA), first metatarsal–medial cuneiform angle (1MCA), medial cuneiform–first metatarsal angle (MC1A), relative cuneiform slope (RCS), and distal medial cuneiform angle (DMCA) were measured and recorded for all patients preoperatively and postoperatively.

Results:
--Of the 76 feet that met inclusion criteria, radiographic improvements were noted in HVA (23.6 degrees), 1-2 IMA (6.2 degrees), 1MCA (6.4 degrees), MC1A (6.5 degrees), and RCS (3.3 degrees) comparing preoperative and postoperative radiographs. There was no difference noted with DMCA measurements (0.5 degrees).

Finally, these results suggest that independent care of the first-TMT joint would reduce radiographic alignment and subluxation of the joint. Evidence indicates that changes in the HVA will affect the first-TMT joint's radiographic alignment and subluxation.

Source: https://journals.sagepub.com/doi/full/10.1177/24730114211008514
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