Comparison between natural rubber knee support and sponge knee support on the protection of knee joint: A crossover randomized controlled study among patients with bleeding disorders.

Background And Aims: Knee support, frequently made from sponge, is used to reduce injury. Sponge has less elasticity and durability compared with natural rubber. To our knowledge, there was no study that demonstrated the effectiveness of natural rubber and sponge in prevention of injury in children with bleeding disorders.