If you had a knee replacement, we prefer you sleep on your back with the leg in full extension for two weeks. 

If you had a hip replacement, you can sleep on your nonsurgical side whenever it is comfortable.  You can sleep on your surgical side when the wound has healed, about 4 weeks.

If you had a revision hip replacement, you may not be able to sleep on your side for 4-6 depending if there are any formal hip precautions to help prevent a dislocation.

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