Dislocation of Rotating Hinged Knee Prostheses in a Patient With Extensor Mechanism Dysfunction

Abstract

Rotating hinged knee replacements are used to restore knee stability when intrinsic stability is lost in the form of soft tissue compression. With medical engineering advancements and improvements in arthroplasty, intrinsic stability can be achieved by an implant post system. We present the case of a 44-yearold female who presented with post-traumatic right knee multi-ligamentous instability and advanced secondary osteoarthritis following a traumatic knee dislocation two years ago. The patient initially underwent a hinged total knee replacement. After five years, she got dislocation of hinged total knee replacement that affected her condition and necessitated emergency admission for open reduction and revision. Most reported cases of rotating hinge prosthesis dislocation occurred during the first year of follow-up. However, our case dislocated after five years of follow-up due to dislodgement from the tibial tray with the polyethylene channel in the form of fatigue failure of the anti-dislocation mechanism.

Limited Revision with a Newly Designed Hinge Device for the Treatment of Mega‐Prosthesis Hinge Failure: Two Case Reports

“…Henderson defined Type III structural failure complications as the breakage or wear of prosthesis components 21 . This complication is less common, but it is still frequently reported 13,22,23 . Treating this group of patients with minimal trauma is a clinical challenge.…”

“… 21 This complication is less common, but it is still frequently reported. 13 , 22 , 23 Treating this group of patients with minimal trauma is a clinical challenge.…”