title: Second Metatarsal Transfer Lesions Due to First Metatarsal Shortening After Distal Chevron Metatarsal Osteotomy for Hallux Valgus.
abstract: BACKGROUND
  The first metatarsal bone can shorten after a distal chevron metatarsal osteotomy (DCMO). This shortening can result in a postoperative second metatarsal transfer lesion. The aim of the present study was to investigate the occurrence of second metatarsal transfer lesions after DCMO.
  
  
  METHODS
  This study involved 185 feet (138 patients), with hallux valgus (HV) deformity, treated with DCMO with Akin osteotomy. The mean patient age was 51.7 years (range, 21 to 74). Patients were followed for an average of 28 months, between June 2004 and June 2010. We measured the length of first metatarsal relative to second metatarsal preoperatively and postoperatively, using Morton's and Hardy-Clapham's methods. A second metatarsal transfer lesion was defined as a newly developed lesion, including metatarsalgia, a painful callosity, or a painless callosity, which was not present prior to the DCMO. The relation of the shortened first metatarsal after DCMO with the occurrence of second metatarsal transfer lesion was evaluated.
  
  
  RESULTS
  Second metatarsal transfer lesions (painless callosity) developed in 5 feet (2.7%) of 185 feet. Twenty-four preoperative second metatarsal lesions were improved postoperatively. The median shortening of the first metatarsal bone after DCMO was 0.6 mm according to Morton's method (range, -6.4 to 6.4), and 1.9 according to Hardy-Clapham's method (range, -5.8 to 5.8). According to the extent of first metatarsal shortening after DCMO by Hardy-Clapham's method and Morton's method, there was no significant difference of the occurrence of second transfer metatarsal lesions (P = .259 and P = .176, respectively).
  
  
  CONCLUSIONS
  In our study, second metatarsal transfer lesions developed in 2.7% of feet after DCMO. The occurrence of second metatarsal transfer lesions did not appear to be correlated with the degree of first metatarsal shortening in cases with less than 5.8 mm shortening.
  
  
  METHODS
  Level IV, retrospective case series.
authors.affiliation: Department of Orthopaedic Surgery, Uijeongbu St. Mary's Hospital, College of Medicine, Catholic University of Korea, Uijeong bu-si, Gyeonggi-do, South Korea.
authors.forename: Jiyong
authors.initials: J
authors.lastname: Ahn
authors.affiliation: Department of Orthopaedic Surgery, Asan Medical Center, University of Ulsan, College of Medicine, Seoul, South Korea hosng@amc.seoul.kr.
authors.forename: Ho Seong
authors.initials: HS
authors.lastname: Lee
authors.affiliation: Department of Orthopaedic Surgery, Dong-A University Medical Center, College of Medicine, Dong-A University, Busan, South Korea.
authors.forename: Jeong Ho
authors.initials: JH
authors.lastname: Seo
authors.affiliation: Department of Orthopaedic Surgery, Uijeongbu St. Mary's Hospital, College of Medicine, Catholic University of Korea, Uijeong bu-si, Gyeonggi-do, South Korea.
authors.forename: Ju Yeong
authors.initials: JY
authors.lastname: Kim
mesh_terms: D006215:Hallux Valgus / Q000503:physiopathology / Q000601:surgery*; D006801:Humans; D008682:Metatarsal Bones / Q000503:physiopathology / Q000601:surgery*; D037061:Metatarsalgia; D010027:Osteotomy / Q000379:methods*; D011184:Postoperative Period; D011859:Radiography; D012189:Retrospective Studies
keywords: distal chevron metatarsal osteotomy; hallux valgus; transfer metatarsal lesion