Total Shoulder System Provides Increased Glenoid Exposure

A new stemless total shoulder system with an inlay socket design minimizes bone removal and provides enhanced biomechanical stability.

The Arthrosurface (Franklin, MA, USA) OVOMotion Shoulder Arthroplasty System is designed for patients with painful and/or severely disabled shoulder joints resulting from arthritis, traumatic events, or avascular necrosis. The single use implant includes a chrome-cobalt ovoid shaped articular component with seven offset choices, a Titanium plasma spray undercoating, and a Morse taper that joins the ovoid head to a cannulated Titanium fixation component in order to provide stable and immobile fixation and stress bearing contact at the bone/prosthetic interface.

When used in conjunction with the Arthrosurface Inlay Glenoid System, the system restores the articular surface geometry of the humeral head, preserving all of the surrounding joint structures. The surgical technique involves off-axis preparation of the glenoid fossa using an innovative three-dimensional (3D) mapping system. Following a series of reaming and trialing, the best fit is determined. Once the socket is reamed to the correct depth, peg holes and perforations are made in the bone bed. Bone cement is then placed and pressurized using a silicon finger sleeve. Finally, the OVOMotion shoulder implant is seated and impacted into place.

“The OVOMotion Shoulder Arthroplasty System is intended to be the first of a three-element modular stemless system that will ultimately allow surgeons to intra-operatively choose between stemless, traditional, and reverse options,” said Steve Ek, CEO of Arthrosurface.

“This truly is a revolutionary stemless total shoulder, which combines the concept of anatomic restoration with an aspherical head design that more closely replicates patient anatomy, but also allows improved joint access for ease of preparation of the glenoid,” said Anthony Miniaci, MD, of the Cleveland Clinic (OH, USA).

The glenoid fossa is a shallow, pyriform articular surface that together with the humerus forms the glenohumeral joint. The cavity surface is covered with cartilage in the fresh state, and its margins give attachment to the fibrocartilaginous glenoid labrum, which deepens the cavity. By being so shallow, the glenoid cavity allows the shoulder joint to have the greatest mobility of all joints in the body, with 120 degrees of unassisted flexion. To maintain stability, strong glenohumeral ligaments and muscles hold the humerus in place; the rotator cuff reinforces the joint.

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