title: Screw migration from total knee prostheses requiring subsequent surgery.
abstract: Complications in total knee arthroplasty directly related to hardware failure other than polyethylene wear are rare. We report 2 cases of symptomatic screw migration into the joint space from total knee prostheses. In the first case, a screw disengaged from a constrained condylar knee prosthesis. Arthroscopy using standard arthroscopy portals and a small arthrotomy were performed to remove the screw. In the second case, symptomatic screw disengagement and posterior migration from the tibial component of a posterior-stabilized prosthesis occurred. Revision with replacement of the polyethylene insert and locking screw was required.
authors.affiliation: Division of Orthopaedic Surgery, Stanford University School of Medicine, Stanford, California 94305, USA.
authors.forename: Steven N
authors.initials: SN
authors.lastname: Shah
authors.forename: David J
authors.initials: DJ
authors.lastname: Schurman
authors.forename: Stuart B
authors.initials: SB
authors.lastname: Goodman
mesh_terms: D000368:Aged; D019645:Arthroplasty, Replacement, Knee / Q000009:adverse effects*; D001863:Bone Screws; D004868:Equipment Failure; D005260:Female; D005548:Foreign-Body Migration / Q000000981:diagnostic imaging / Q000209:etiology*; D006801:Humans; D008875:Middle Aged; D020370:Osteoarthritis, Knee / Q000601:surgery; D011859:Radiography; D012086:Reoperation