Failure at the femoral stem extension-condylar interface in a rotating hinge knee without radiographic evidence of loosening.

ABSTRACT: Modular stem extensions have become ubiquitous in revision total knee arthroplasty systems. Although stem extensions are valuable in addressing bone deficiencies and improving implant fixation, the stem extension-condylar interface may be a point of implant failure. We report a case of failure at the femoral stem extension-condylar interface in a Zimmer NexGen Rotating Hinge Knee (Zimmer, Warsaw, IN). Currently, several published case reports describe failure at the femoral stem extension-condylar interface but only 1 case describes loosening at a taper junction without evidence of set screw failure or taper fracture. Furthermore, no published cases describe this type of failure in the Zimmer NexGen Rotating Hinge Knee (Zimmer).

SUBMITTER: Kahan M 

PROVIDER: S-EPMC7083710 | biostudies-literature | 2020 Mar

REPOSITORIES: biostudies-literature