In the strictest of uses, that is when the patient has fully optimized the status of the knee and no further improvement can be expected. This usually relates to an endpoint of healing after an injury or surgery, which was followed by rehabilitation of the joint and associated musculature. As the condition is stabilized, it is "unlikely to change substantially in the next year, with or without medical treatment. Over time, there may be some change; however, further recovery or deterioration is not anticipated" per 5th Guides. Work hardening type programs allow for work specific conditioning to optimize endurance and minimize reinjury on return to work. The term "quiescent" is also used to describe the state of recovery when there is stabilization and no further improvement is expected.