What is the neck angle of Synergy Stems?

What is the neck angle of Synergy Stems?

• A. 125 degrees
• B. 128 degrees
• C. 131 degrees
• D. 135 degrees

Answer: (C)

The neck angle is the angle at which the stem’s neck sits relative to the main shaft, shaping how the prosthetic head is positioned and how the joint’s geometry will sit after implantation. For the Synergy stem family, this fixed geometry is 131 degrees, a design choice that helps reproduce the natural alignment of the joint and maintain proper soft-tissue tension and biomechanics. Angles that are too small or too large would shift the head position and alter offset, which can affect range of motion and impingement risk. So, 131 degrees is the standard neck angle for these stems.

The neck angle is the angle at which the stem’s neck sits relative to the main shaft, shaping how the prosthetic head is positioned and how the joint’s geometry will sit after implantation. For the Synergy stem family, this fixed geometry is 131 degrees, a design choice that helps reproduce the natural alignment of the joint and maintain proper soft-tissue tension and biomechanics. Angles that are too small or too large would shift the head position and alter offset, which can affect range of motion and impingement risk. So, 131 degrees is the standard neck angle for these stems.