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Differences Between Fixed Bearing Platform & Rotating Knees: Richard D. Komistek, Ph.D.

Featuring the Sigma® Rotating Platform System with AOXTM, Antioxidant Polyethylene

Watch orthopaedic surgeon Robert Gorab perform a total knee arthroplasty using the Sigma® Balanced Surgical Technique from DePuy Orthopaedics, Inc.

The webcast will be moderated by orthopedic surgeon Dr. Douglas Dennis and biomedical engineering professor Dr. Richard D. Komistek.  The surgery will be broadcast live from the Hoag Orthopedic Institute in Irvine, California. Dr. John P. Collier of Dartmouth College will also join the live discussion via teleconference.  Viewers are encouraged to email their questions, which will be answered live on Tuesday, February 28, 2012 at 4PM Pacific (7PM EDT).

Sigma® Balanced Surgical Technique

Contemporary total knee arthoplasty demands high performance instrumentation that provides enhanced efficiency, precision and flexibility. Through a program of continuous development, DePuy now offers a single system of High Performance instruments that supports your approach to knee replacement surgery.

This surgical technique provides instruction on the implantation of the Sigma® family of fixed bearing and rotating platform knees utilizing the Balanced resection instrumentation. There are several approach options available to the surgeon, the most common are: medial parapatellar, mini-midvastus and mini-subvastus.

AOX™ Antioxidant Polyethylene

During the live knee replacement surgery Dr. Gorab will also feature DePuy Orthopaedics newest product, the AOX™ Antioxidant Polyethylene, the next generation of polyethylene for rotating platform knees.

Using its advanced blend of polyethylene resin and a unique antioxidant, COVERNOX™, DePuy Orthopaedics has created a new polyethylene material that has extraordinary efficiency in trapping free radicals and scavenging oxygen. This first of its kind combination is designed to deliver optimal wear resistance and long term oxidative stability.

By eliminating the annealing or remelting process, AOX polyethylene delivers outstanding oxidative stability and optimum wear resistance without compromising the mechanical properties of polyethylene.1, 2

Patients expect to continue their active lifestyles post-surgery, so today’s knee implants need to meet these demands. DePuy Orthopaedic is dedicated to developing and evolving technology for clinical success that benefits both patients and surgeons. With the introduction of AOX Antioxidant Polyethylene, only DePuy Orthopaedics offers designs to accommodate the different philosophies of PCL management, wear reducing benefits of rotating platform and oxidative stability.


1. Data on File at DePuy Orthopaedics, Inc. WR070300.

2. Data on File at DePuy Orthopaedics, Inc. WR070248.




Robert S. Gorab

Robert S. Gorab, MD

Orthopaedic Surgeon

Douglas Dennis

Douglas Dennis, MD

Orthopaedic Surgeon

Richard D. Komistek

Richard D. Komistek, PhD

Fred M. Roddy Distinguished Professor of Biomedical Engineering

John P. Collier

John P. Collier, PhD

Myron Tribus Professor of Engineering Innovation

DePuy Orthopaedics, Inc. Product Information