The modified Lapidus arthrodesis: a retrospective analysis.

The authors present a review of 47 modified Lapidus arthrodesis procedures performed between 1985 and 1995. There were 29 females and 10 males. Eight patients underwent bilateral procedures. The average follow-up was 6.3 years (range, 1.5-10.6 years). The patients were evaluated preoperatively and postoperatively using standard weightbearing radiographs, clinical examination, and chart review. The average preoperative intermetatarsal angle was 13.8 degrees degrees, and the average postoperative intermetatarsal angle measured 2.1 degrees degrees, with a mean improvement of 10.8 degrees. The average effective shortening of the first metatarsal was 4.7 mm in those patients without bone graft. In patients whom bone graft was utilized, an average effective increase in first metatarsal length of 2.6 mm was identified. Complications included delayed union (n = 2), nonunion (n = 3), postoperative development of hyperkeratosis beneath the second metatarsal head (n = 4), elevation of the first ray (n = 3), and hallux varus (n = 2). There were no recurrences of hallux abducto valgus at follow-up. The average return to preoperative activity level was 13 weeks. Forty-two of the 47 procedures healed uneventfully. Of the remaining five feet, two required the use of a bone growth stimulator, and three required revisional surgery with autogenous bone graft to promote arthrodesis and restore alignment. In conclusion, the modified Lapidus arthrodesis is both a predictable and durable procedure for the correction of hallux abducto valgus.