title: Effect of Bipartite Hallucal Sesamoid on Hallux Valgus Surgery.
abstract: BACKGROUND
  Bipartite hallucal sesamoids are often found in patients with hallux valgus. However, it is unknown whether bipartite hallucal sesamoids affect the results of hallux valgus surgery or not. The purpose of the present study was to evaluate the outcomes of chevron osteotomy for hallux valgus with and without bipartite hallucal sesamoid.
  
  
  METHODS
  A total of 152 patients (168 feet) treated with distal or proximal chevron osteotomy for hallux valgus constituted the study cohort. The 168 feet were divided into 2 groups: bipartite hallucal sesamoid (31 feet) and without bipartite hallucal sesamoid (137 feet). Hallux valgus angle (HVA), intermetatarsal angle (IMA), distal metatarsal articular angle (DMAA), tibial sesamoid position, and first metatarsal length were measured for radiographic outcomes and the American Orthopaedic Foot & Ankle Society (AOFAS) hallux metatarsophalangeal-interphalangeal (MTP-IP) score was measured for clinical outcomes.
  
  
  RESULTS
  All radiographic measurements and the AOFAS score showed significant ( P < .05) improvement at the time of final follow-up compared with preoperative measurements in both groups. No significant differences ( P > .05) were found between the 2 groups in terms of HVA, IMA, DMAA, tibial sesamoid position, metatarsal shortening, and AOFAS score on final follow-up.
  
  
  CONCLUSIONS
  This study suggests that bipartite hallucal sesamoids do not affect the results of hallux valgus surgery.
  
  
  METHODS
  Level III, retrospective comparative study.
authors.affiliation: 1 Department of Orthopedic Surgery, Korea University Guro Hospital, Seoul, Korea.
authors.forename: Young Hwan
authors.initials: YH
authors.lastname: Park
authors.affiliation: 1 Department of Orthopedic Surgery, Korea University Guro Hospital, Seoul, Korea.
authors.forename: Chan Dong
authors.initials: CD
authors.lastname: Jeong
authors.affiliation: 2 Department of Orthopedic Surgery, Korea University Ansan Hospital, Seoul, Korea.
authors.forename: Gi Won
authors.initials: GW
authors.lastname: Choi
authors.affiliation: 1 Department of Orthopedic Surgery, Korea University Guro Hospital, Seoul, Korea.
authors.forename: Hak Jun
authors.initials: HJ
authors.lastname: Kim
mesh_terms: D006214:Hallux / Q000502:physiology*; D006215:Hallux Valgus / Q000601:surgery*; D006801:Humans; D008682:Metatarsal Bones / Q000601:surgery*; D008683:Metatarsophalangeal Joint / Q000503:physiopathology*; D010027:Osteotomy / Q000379:methods*; D011859:Radiography; D012189:Retrospective Studies; D013977:Tibia / Q000503:physiopathology / Q000601:surgery*; D016896:Treatment Outcome
keywords: bipartite hallucal sesamoid; chevron osteotomy; hallux valgus