title: Dissociation of the glenoid component in the Macnab/English total shoulder arthroplasty.
abstract: Three episodes of mechanical glenoid component failure in two patients are presented. The glenoid component that failed is a two-piece polyethylene metal-backed design, with a snap-fip interlock of the polyethylene insert. The mode of failure with this design should caution both orthopaedic surgeons and implant manufacturers that mechanical dissociation of a snap-fit glenoid liner can occur, and that discretion is advised in their design, fabrication, and use.
authors.affiliation: Orthopedic Surgery Group, S.C., Peoria, IL 61603.
authors.forename: R P
authors.initials: RP
authors.lastname: Driessnack
authors.forename: D C
authors.initials: DC
authors.lastname: Ferlic
authors.forename: J D
authors.initials: JD
authors.lastname: Wiedel
mesh_terms: D000368:Aged; D006801:Humans; D008297:Male; D008875:Middle Aged; D019736:Prostheses and Implants; D011474:Prosthesis Design; D011475:Prosthesis Failure; D011859:Radiography; D012782:Shoulder / Q000000981:diagnostic imaging; D012785:Shoulder Joint / Q000601:surgery*