Which cast type is used for fractures around the patellar area and involves a cylindrical configuration?

• A. Thumb Spica Cast
• B. Cylinder Cast
• C. Cylinder Mold
• D. Patellar Tendon Bearing Cast

Answer: (C)

The key idea is that immobilizing fractures near the knee benefits from a true cylindrical contour that fits snugly around the patellar region. A cylinder mold cast achieves this by using a form or mold to shape the plaster or fiberglass into a uniform cylinder over the knee. That mold creates even circumferential support around the patellar area, which helps stabilize the fracture while accommodating soft-tissue swelling and reducing localized pressure points.

This shape and fit make it especially suited for fractures around the patellar area, where the knee’s contours require a consistent, round cross-section to keep the joint immobilized without sharp edges or gaps. Other options don’t provide that knee-specific cylindrical guidance: a thumb-spica cast is meant for the hand and wrist, a plain cylinder cast lacks the molded fit around the patella, and a patellar tendon bearing cast is a prosthetic socket concept rather than a fracture immobilization technique.