oldmama44,
The wound should have been completely healed by now.
You should be evaluated as to why the incision is still not healed. If you have a sinus tract from the incision, to the hip joint, you could have a deep seated infectoin.
Not all infections will produce the fever, chills, etc that is usually seen with an acute infection. Often the chronic ones are sequestered, so the body's reaction to them is less. They have essentially been walled off from the rest of the body.
Occasionally, a patient will "spit out" some of the buried sutures in the incision line, months or even years later. But, these are small pimple like areas, and the rest of the incision is healed nicely.
If it is a suture abscess, these usually heal up and go away once the suture is removed. But, if the area has been open and draining from the time of surgery, then that needs to be evaluated.
Three and a half months after a major orthopedic surgery is barely enough time for the soft tissues to have healed initially. The soft tissues will often take 9 to 12 months to completely mature and stretch out to their final working position.
You still have a long way to go in terms of rehab and final functional status. Most patients do not reach a plateau and find their ultimate functional status until at least 12 to 18 months after a total hip or total knee replacement.
If you have significant drainage, that needs evaluation. But, if a significant infection is ruled out, you then need to keep working on rehab, especially on stretching, strengthening, and endurance aspects. Hang in there, you have a ways to go. Good luck.