title: [Diagnosis and treatment of the metacarpophalangeal joint locking caused by sesamoid turned-over dislocation of the thumb].
abstract: OBJECTIVE
  To introduce diagnosis and treatment of the metacarpophalangeal joint (MPJ) locking caused by sesamoid turned-over dislocation of the thumb.
  
  
  METHODS
  Five cases with metacarpophalangeal joint locking were involved in the study, male 4 and female 1. The average age was 35 years old(ranging from 18 to 47 years). All the patients received manual reduction under local anaesthesia. But only three were successful, others patients were reduced by operation. Metacarpophalangeal joint locking caused by sesamoid turned-over dislocation with the volar plate and the short flexor muscle of the thumb tendon were reveded. The metacarpophalangeal joint locking was released after reduction of sesamoid turned-over dislocation of the thumb.
  
  
  RESULTS
  The mean follow-up time was 15 months (3-34 months). The mean range of MPJ flexion was 45 degrees (35 degrees - 60 degrees). The signs for pain and swelling were released. Satisfactory thumb opposition can be seen.
  
  
  CONCLUSIONS
  It was one of the important reasons of the metacarpophalangeal joint locking caused by sesamoid turned-over dislocation of the thumb.
authors.affiliation: Department of Hand and Foot Surgery, Zhejiang Provincial Corps Hospital of Chinese Peoples Armed Police Forces, Jiaxing 314000, Zhejiang, China. xixunwang@163.com
authors.forename: Xi-xun
authors.initials: XX
authors.lastname: Wang
authors.forename: Jun
authors.initials: J
authors.lastname: Li
authors.forename: Zhe
authors.initials: Z
authors.lastname: Tong
authors.forename: Wen-hai
authors.initials: WH
authors.lastname: Sun
authors.forename: Bo
authors.initials: B
authors.lastname: Chen
authors.forename: Ji-chao
authors.initials: JC
authors.lastname: Hu
authors.lastname: Cui-Yan
authors.lastname: Wei-Yong
authors.lastname: Pan-Yue
mesh_terms: D000293:Adolescent; D000328:Adult; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D004204:Joint Dislocations / Q000175:diagnosis* / Q000000981:diagnostic imaging / Q000601:surgery / Q000628:therapy*; D008297:Male; D008662:Metacarpophalangeal Joint / Q000000981:diagnostic imaging / Q000293:injuries*; D008875:Middle Aged; D012716:Sesamoid Bones / Q000000981:diagnostic imaging / Q000293:injuries*; D013933:Thumb / Q000000981:diagnostic imaging / Q000293:injuries*; D014057:Tomography, X-Ray Computed