Modified Buck's Extension Traction is used for post-poliomyelitis with residual paralysis of the hip and knee.

• A. Hammock Suspension Traction
• B. Cotrel Traction
• C. Bohler Braun Splint
• D. Modified Buck's Extension Traction

Answer: (D)

Post-polio with residual paralysis of the hip and knee often causes fixed flexion deformities from muscle imbalance. The aim is to lengthen the tight soft tissues and gradually restore extension without requiring active muscle power. Modified Buck's Extension Traction provides a controlled extension pull on the lower limb, keeping the hip and knee in an extended position while applying a steady longitudinal force. This setup allows the posterior structures (like the hamstrings and hip flexors) to lengthen over time, improving range of motion and alignment when muscles are weak or paralyzed. It’s particularly useful because it offers a nonoperative way to achieve gradual correction in limbs affected by polio.

The other methods are used for different problems: hammock suspension traction is a general or alternative traction method not specifically tailored to post-polio hip–knee deformities; Cotrel traction is a technique associated with spinal deformities; Bohler Braun splint is a traction splint used mainly for fractures of the femur or leg injuries.