The offset of heads in the Univers II Total Shoulder is?

• A. 3.5 mm
• B. 2.0 mm
• C. 4.5 mm
• D. 1.5 mm

Answer: (A)

Offset in a shoulder implant refers to how far the center of the humeral head is moved laterally from the stem’s axis. This lateralization is crucial because it re-creates the natural center of rotation of the shoulder, which in turn tunes the tension in the rotator cuff and deltoid and ensures smooth, stable joint mechanics.

In the Univers II Total Shoulder, the head component is designed with a fixed offset of 3.5 mm. This value is chosen to restore the native lever arm and joint kinematics for a wide range of patients, helping achieve good range of motion while maintaining appropriate muscle tension and reducing the risk of impingement or instability. It’s the standard offset for this system, while other configurations or models may offer different offsets. So the offset of heads is 3.5 mm.