<qa>  What is the name of the type of joint replacement that may be affected by the defined exercise protocolParticipants requested to complete an exercise protocol will not be eligible for an exercise MRI if they do not meet the eligibility criteria for that particular exercise protocol. Examples include joint replacements that may be affected by the defined exercise protocol or which may prevent MRI analysis or any condition, in the opinion of the investigator, that would prevent successful completion of the exercise protocol such as, but not limited to reported osteoarthritis, rheumatoid arthritis andor fibromyalgia. 