Once the shock is absorbed during weight acceptance of stair descent, how much does knee flexion increase? Naim 00:13 Stair Negotiation Once the shock is absorbed during weight acceptance of stair descent, how much does knee flexion increase? Answer: Goes from 10-15 degrees of knee flexion to 20-25 degrees of knee flexion Learn More : Share this Share on FacebookTweet on TwitterPlus on Google+