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TREATMENT OF ACQUIRED HALLUX VARUS DEFORMITY



Abstract

Hallux varus is a rare cause of pain in the foot mostly occurring after failed hallux valgus surgery. We reviewed 12 patients with unilateral hallux varus treated with soft tissue techniques (4x), arthrodesis of the first metatarso-phalangeal joint (3x) or with a distal chevron osteotomy (5x) with medial transposition of the first metatarsal head and reconstruction of the soft tissues on the lateral side of the metatarsophalangeal joint. 10 patients had previous hallux valgus surgery, in 2 cases the deformities were of unknown origin. 1 male and 11 female patients were followed up on average 26.4 months postoperatively. AOFAS hallux score improved from 46 (range 10–75) to 86 (range 72–95) points. The metatarsophalangeal angle measured with the center-head to center-base method was reduced from −16.1° (range −35° to −8°) to 5.1° (range −15° to 21°). The intermetatarsal angle increased from 5.8° (0–11°) t o 10.5° (0–19°). All patients were subjectively satisfied with the procedure. Our results indicate that joint preserving operation techniques are viable methods in the correction of mild and moderate symptomatic hallux varus deformities. Mild remaining varus deformities are well tolerated.

In case of severe varus deformity or major signs of osteoarthritis in the first metatarsophalangeal joint MTP arthrodesis provides good results.

Correspondence should be addressed to: EFORT Central Office, Technoparkstrasse 1, CH – 8005 Zürich, Switzerland. Email: office@efort.org