What is the distal thickness of the JII UKA femoral component?

What is the distal thickness of the JII UKA femoral component?

• A. 5.5 mm
• B. 6.0 mm
• C. 6.5 mm
• D. 7.0 mm

Answer: (C)

Distal thickness refers to how much metal sits on the distal femoral surface of a unicompartmental knee component, which sets the joint line and helps balance the soft tissues in extension. For the JII UKA design, 6.5 mm is the standard distal thickness chosen to reproduce the native distal femur geometry after resection and to maintain proper ligament tension and knee kinematics. Using this thickness helps keep the extension gap appropriate and avoids overstuffing or loosening of the joint. Thicker options would raise the joint line and overly tighten the tissues, while thinner options could underfill the distal femur and affect stability and contact. Therefore, 6.5 mm is the best-fit choice.

Distal thickness refers to how much metal sits on the distal femoral surface of a unicompartmental knee component, which sets the joint line and helps balance the soft tissues in extension. For the JII UKA design, 6.5 mm is the standard distal thickness chosen to reproduce the native distal femur geometry after resection and to maintain proper ligament tension and knee kinematics. Using this thickness helps keep the extension gap appropriate and avoids overstuffing or loosening of the joint. Thicker options would raise the joint line and overly tighten the tissues, while thinner options could underfill the distal femur and affect stability and contact. Therefore, 6.5 mm is the best-fit choice.