Which position is LEAST beneficial for decreasing knee extensor tone through weight-bearing positioning?

• A. Sitting
• B. Half kneeling
• C. Kneeling
• D. Quadruped

Answer: (A)

Weight-bearing input through joints can help dampen knee extensor tone by providing proprioceptive feedback that modulates reflex activity in the quadriceps. When the knee is placed in flexion with body weight bearing through the limb—such as in half kneeling, kneeling, or quadruped—the knee extensors are maintained in a position where this sensory input and sustained stretch can inhibit excessive quadriceps firing, reducing spastic tone.

Sitting, on the other hand, offers minimal weight bearing through the knee joint. The knee is flexed but not bearing the body’s weight, so that proprioceptive input is limited and the neuromuscular system doesn’t receive the same tone-damping stimulus. Therefore, sitting is the least effective position for decreasing knee extensor tone via weight-bearing.