3% of arthritic knees, 2.5% of arthritic hips, and 2% of arthritic shoulders are replaced every year, so...
Small joint replacements have historically been failures. Wrist, elbow, and other small joint replacements are plagued by loosening and poor survivorship.
This has led to arthrodesis - the complete fusion of the joint - becoming the standard of care. The procedure is durable, but it can catastrophically effect the patient's quality of life.