Final answer:
Predictive measures of ambulatory status after a hip fusion to arthroplasty conversion include the duration of hip fusion, patient's health, and post-operative rehabilitation quality.
Step-by-step explanation:
The measure that is predictive of ambulatory status after converting a hip fusion to an arthroplasty is multifactorial and can depend on the extent of the original hip pathology, the length of time the hip was fused, the patient's overall health and muscle strength, and the quality of post-operative rehabilitation.
The total hip replacement surgery, as shown in Figure 5.1, becomes necessary when a patient's femoral head fits into a new cup with a hard plastic-like inner lining. Successful conversion from a hip fusion to total hip arthroplasty (THA) often entails careful patient selection, pre-surgery planning, and post-operation rehabilitation to improve the chances of regaining ambulation.