Outcomes of Lapidus Procedure Without Focused Frontal Plane Rotation of the First Metatarsal

Background: We present a retrospective radiographic analysis showcasing the ability to correct hallux valgus using the Lapidus arthrodesis without focused frontal plane rotation of the first metatarsal. Methods: A total of 33 feet in 30 patients who had undergone Lapidus arthrodesis for the treatment of hallux abducto valgus deformity from 1 August 2015 to 31 December 2020 were identified. The median age of the cohort was 55.4 years (range, 33-78 years), 23 were female (76.7%), three (10%) underwent bilateral Lapidus arthrodesis, and the median duration of follow-up was 15.9 months (range, 5-72 months). Results: The median (minimum, maximum) preoperative first intermetatarsal angle was 16° (13°, 28°), and at final follow-up it was 5° (0°, 6°) (p < 0.001). The median (minimum, maximum) preoperative hallux abductus angle was 37° (26°, 51°), and at final follow-up it was 8.5° (0°, 22.5°) (p < 0.001). The median (minimum, maximum) preoperative tibial sesamoid position was 6 (4, 7), and at final follow-up it was 3 (2, 5) (p = 0.001). Conclusions: We found the radiographic first metatarsal lateral round sign to be ambiguous. Qualitative comparison of the results of this investigation with prior studies describing outcomes following Lapidus arthrodesis with focused frontal plane rotation of the first metatarsal suggests that similar outcomes can be achieved without employment of a decisive frontal plane rotation of the first metatarsal. Our findings lead us to believe that correction of substantial hallux abducto valgus deformities can be accomplished using the Lapidus procedure combined with lateral release of the first metatarsophalangeal joint without focused derotation of the first metatarsal.