Wright Medical INBONE Total Ankle System

Ankle Anatomy
The human ankle is a joint that acts much like a hinge. The joint is formed by the union of three bones. The ankle bone is the talus. The top of the talus fits inside a socket that is formed by the lower end of the tibia, often called the shinbone, and the fibula, the small bone of the lower leg. The bottom of the talus sits on the heel bone, called the calcaneus. As one of the most flexible, free-moving joints in the body, the normal ankle can move forwards, from side-to-side, and twist. Like other free-moving joints, the ankle contains cartilage which absorbs shock. It is held together with ligaments – straps of tough tissue, which help prevent the joint from dislocating. Full function of the ankle joint dependsAnatomy on the successful coordination of many interrelated parts including bones, muscles, tendons, ligaments, and nerves. In patients with arthritis, one of the most common reasons for ankle replacement surgery, the cartilage in the joint has worn down, resulting in bone-on bone contact, causing pain and limited activity.

Diseases of the Ankle

What Is Rheumatoid Arthritis?

Rheumatoid arthritis occurs when the body’s own immune system attacks the synovial lining of the joints, just as it would a foreign bacteria. Synovial fluid is a clear, smooth, oil-like lubricating liquid that makes it easier for the joints to move.

What Is Tarsal Tunnel Syndrome?

Tarsal Tunnel Syndrome is the result of nerve compression in the ankle as the sensory nerve passes under the tarsal tunnel and the tunnel is irritated by pressure. The result is numbness and tingling in the foot and ankle.

What Is Ankle Injury?

Ankle injury occurs when there is trauma to the joint. Symptoms include swelling, pain, weakness and difficulty walking. These injuries can significantly affect your mobility.
Ankle Replacement

Total ankle replacement is a viable surgical solution for pain reduction in the joint. It is a bone-conserving, less-invasive approach than in the past. Your doctor has recommended ankle replacement for you, based on your unique and specific condition. A total ankle replacement results in increased mobility and pain reduction.

Are There Other Benefits To Ankle Replacement?

The INBONE™ Total Ankle System has many advantages:
• Enhanced fixation
• Bone preservation
• Multiple modular components to assist in anatomical sizing
• Thick poly insert for maximized resistance to wear
• Allows patients to maintain an active lifestyle

The INBONE™ System has been designed to fit your specific anatomy because it is supported by an adjustable length stem and a fixed bearing system for enhanced fixation. The vertical fixation of the implant allows less bone removal and leaves the fibula completely intact. The talar component maximizes cortical bone support to minimize talar subsidence.

Is Ankle Surgery A New Procedure?

Ankle replacement might seem new, but it has been around for many years. Until recently, there were limited options available for ankle replacement. The INBONE™ Total Ankle System began as a leading foot and ankle surgeon’s quest to provide a feasible surgical solution to ankle arthritis patients for pain reduction and restored mobility. The INBONE™ Ankle team carefully studied previous ankle designs to determine the causes of implant failure. With that knowledge in hand, and using design elements already proven successful in hip and knee implants, INBONE™ Ankle engineers designed a total ankle replacement that could replicate natural anatomy.

What Makes Wright’s INBONE™ Implant Different From Competitors?

The INBONE™ Ankle modular design feature of the tibial stem allows the physician to select the appropriate number of pieces based on patient size and bone structure. This results in a more precise fit and less-invasive installation process with minimal bone removal. Other procedures offer only stems available in specific sizes which does not allow a customizable fit. The patented Foot Holder secures your foot but the ankle remains dynamic. Guide rods determine exact alignment allowing the surgeon to precisely position the prosthesis. This eliminates any guess work on the surgeon’s part. No other ankle implant utilizes this type of installation guidance.

Dr. Craig H. Thomajan, DPM, FACFAS, FAENS
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Founder and Managing Partner of Austin Foot and Ankle Specialists