Knee balancing for revision procedures

US8506571B2 · kind B2 · utility

Assignee

• Synvasive Technology, Inc. · US

Inventors

• Barjinder Chana · Reno, US
• Michael G. Fisher · Blieskastel, DE

Key dates

• Filing date: Apr 9, 2010
• Grant date: Aug 13, 2013
• Expiry date: Aug 2, 2031

Classification

• Technology area (CPC A): Human Necessities
• CPC primary: A61F2/38
• WIPO field: Medical technology
• WIPO sector: Instruments

Abstract

Methods, systems and devices are provided for facilitating a surgical procedure on a knee, particularly, a revision total knee replacement procedure. Prior femoral and tibial prostheses are removed. A cut end of a distal femur is engaged with a femoral adjustment member, which will typically center itself about an intramedullary rod placed into the femur. The lateral and medial forces exerted by lateral and medial sides of the femoral adjustment member and the cut tibial plateau against each other are measured. The femoral adjustment member is adjusted to apply and/or adjust tension to the lateral collateral ligament and/or the medial collateral ligament based on the measured forces, for example, such that the measured lateral force and the measured medial force are matched. Based on the position of the adjusted femoral member, guided clean-up cuts for placement of a new femoral prostheses are made on the cut end of the distal femur.