Is it possible to have a hip and knee replacement, on the same leg, at the same time? And if so, would healing be prolonged?

Yes, it is possible to have a hip and knee replacement on the same leg at the same time, although there are certain circumstances which may necessitate this approach.

On rare occasion, this procedure is necessary when an individual experiences osteonecrosis of both their hip and knee joints at once. Osteonecrosis results from decreased blood supply to a joint resulting in death of part or all of that joint's bone tissue; typically seen in younger individuals or those with medical conditions such as arthritis or gout. As such, performing both replacements simultaneously would provide the most complete healing and restoration of function for these patients.

Regarding extended healing times, recovery periods are highly individualized depending on age, physical condition prior to surgery and other factors like smoking history which can impair post-operative wound healing. Most individuals undergoing simultaneous hip and knee replacement will experience an average recovery time between 12-15 weeks if they follow their prescribed physical rehabilitation program diligently.

While instances where this procedure would be indicated are fairly uncommon it can still bring amazing relief for those suffering from concurrent hip/knee pain due to osteonecrosis since it allows them to drastically reduce their downtime associated with two separate surgeries while achieving optimal relief of symptoms as soon as possible!