Retaining mechanism for a modular tibial component of a knee prosthesis

US6126692A · kind A · utility

Assignee

• NEW YORK SOCIETY FOR THE RELIEF OF THE RUPTURED AND CRIPPLED, MAINTAINING THE HOSPITAL FOR SPECIAL SURGERY · US

Inventors

• Bruce Robie · North Andover, US
• Daniel Rosenthal · Short Hills, US
• Peter Nelson Schmidt · Ithaca, US

Key dates

• Filing date: Jun 25, 1998
• Grant date: Oct 3, 2000
• Expiry date: Jun 25, 2018

Classification

• Technology area (CPC A): Human Necessities
• CPC primary: A61F2230/0054
• WIPO field: Medical technology
• WIPO sector: Instruments

Abstract

The present invention provides a tibial prosthetic knee component. The prosthesis includes a tibial tray having a posterior rail and an anterior rail, and a tibial insert. The tibial insert has a posterior dovetailed surface matching the posterior rail in the tibial tray, and an anterior surface matching the anterior rail in the tibial tray. The posterior rail of the tibial tray and the posterior dovetailed surface of the tibial insert are curved to provide clearance for the posterior cruciate ligament. A retaining clip is provided for retaining the tibial insert in the tibial tray. The clip includes a tab which extends through the tray into the insert and a resilient holding member remains unloaded when loads are applied to the knee, reducing the likelihood of dissociation of the tray and insert.