Background and Rationale:
Surgical correction of Hallux Valgus via Scarf and P1 osteotomy aims to realign the first ray, modifying overall forefoot morphology. While radiological correction is well established, a discrepancy often exists between objective foot measurements and patient-perceived postoperative shoe fitting. Weight-bearing 3D surface scanning provides a non-irradiating, precise method to evaluate volumetric and dimensional changes without the biases of traditional foot-measuring gauges.
Objective and Hypothesis:
The primary objective is to measure changes in shoe size (in French/Paris points) using weight-bearing 3D surface scanning between baseline and 6 months postoperatively. The study hypothesis is that Scarf + P1 osteotomy induces a shoe size reduction of at least 0.5 Paris points at 6 months, correlated with forefoot width reduction, M1 shortening, and angular correction (HVA and M1-M2 angles).
Study Design:
Prospective, single-center, non-comparative interventional study with minimal risks and constraints (RIPH 2) involving 100 participants.
Patient informed about the study and signed written consent obtained in duplicate
Male or female participant aged 18 years or older
Symptomatic hallux valgus without lateral ray involvement, requiring surgical correction by Scarf + P1 osteotomy
Primary surgery planned for the affected foot
Previous bony surgery of the first ray or forefoot on the affected side (osteotomy, arthrodesis)
Surgical indication on lateral rays (claw toes, Weil osteotomy)
Severe lower-limb neurological or vascular disease altering gait or foot morphology (Charcot foot, critical limb ischemia, severe neuropathy)
Active inflammatory rheumatic disease (e.g., rheumatoid arthritis) with polyarticular foot involvement