Features of Radial Head System
•Modular Components: The implant is typically in two parts—a head (to articulate with the humerus and ulna) and a stem (to fit inside the radius bone). This modularity allows surgeons to select the optimal head size and stem type independently.
•Anatomic Design: The head is often shaped to replicate the natural dish and contour of the patient’s original radial head. Key features include:
•Medial Contouring: To properly articulate with the radial notch of the ulna.
•Variable Dish Depth: The concave surface increases with head diameter to improve wear characteristics.
•”Safe Zone” Plating: Some systems include low-profile plates designed specifically to fit in the non-articulating “safe zone” of the radius if the native head is salvageable.
Indication of Radial Head System
•Primary Replacement after Fracture: For severe, comminuted radial head fractures that cannot be repaired.
•Post-Traumatic Disabilities: For patients with pain, crepitation, and decreased motion at the radio-humeral or proximal radio-ulnar joint, often resulting from joint destruction or subluxation.
•Symptomatic Sequelae after Resection: If a previous radial head removal (resection) has led to instability or pain, the implant can replace it.
•Degenerative Joint Disease: For conditions like osteoarthritis or rheumatoid arthritis affecting the radial head.
•Revision Surgery: To replace a previously failed radial head arthroplasty.
