My husband jumped down from a truck about 5 foot from ground, and he did not bend his knees upon impact. He remained stiff and upright when he landed. He thinks that contributes more than if he would have bent his knees in a squat position. He has a lot of problems now with pain, walking, standing, getting in and out of a vehicle. I was hoping that that he could take some supplements for joints that could help. Would you recommend anything?