 Hello, I'm Dr. Sunil Kini, consultant joint replacement and arthroscopy surgeon at Manipal Hospital's Bangalore. The stretches are definitely beneficial as per what your physiotherapy advises you. Stretching increases the blood flow around the joint, helps to decrease the swelling as well as the pain. Certain questions about doing yoga after a joint replacement also arises. Probably after the three months after surgery when the pain in the swelling decreases, then certain posters of yoga can be practiced. Certain don'ts or unavoidable things in this scenario would be to do yoga in certain positions, such as squatting, kneeling or cross-legged, which should certainly be avoided as far as possible.