title: Incarceration of a dislocated mobile bearing to the popliteal fossa after unicompartmental knee arthroplasty.
abstract: The mobile meniscal bearing of unicompartmental knee arthroplasty is completely free moving, and dislocation of this bearing is a major concern for all mobile-bearing designs. Most dislocations are located in the intracapsular area; however, posterior dislocation of the polyethylene bearing to an extra-articular area of the knee after unicompartmental arthroplasty has not been previously reported. During a revision surgery, separate incision was necessary to remove a dislocated meniscal bearing in the popliteal fossa. The authors present a case of incarceration of a dislocated mobile bearing to the popliteal fossa after unicompartmental knee arthroplasty that was missed during initial diagnosis.
authors.affiliation: Department of Orthopaedic Surgery, Chung-Ang University College of Medicine, Seoul, South Korea.
authors.forename: Jae-Heon
authors.initials: JH
authors.lastname: Jeong
authors.forename: Hyun
authors.initials: H
authors.lastname: Kang
authors.forename: Yong-Chan
authors.initials: YC
authors.lastname: Ha
authors.forename: Eui-Chan
authors.initials: EC
authors.lastname: Jang
mesh_terms: D019645:Arthroplasty, Replacement, Knee / Q000295:instrumentation*; D005260:Female; D005548:Foreign-Body Migration / Q000000981:diagnostic imaging* / Q000601:surgery; D006801:Humans; D004204:Joint Dislocations; D007719:Knee Joint / Q000000981:diagnostic imaging* / Q000601:surgery; D007720:Knee Prosthesis; D008875:Middle Aged; D020370:Osteoarthritis, Knee / Q000601:surgery; D011474:Prosthesis Design; D011475:Prosthesis Failure; D011859:Radiography; D012086:Reoperation; D016896:Treatment Outcome