A lot might be explained by the surgical approach as well as the surgeons experience level. My surgeries used the Direct Superior- the periformis is released and reattached but the glute minimus is only retracted to the side for access. That stretching however is trauma enough and was and still is a source of continuing challenge to heal at 4 and 6 months respective of each hip procedure. 10 months seems like a very long time for soft tissue to heal. I would want the doctor to do a very thorough examination and I'd be insistent imaging include tissue status. A question I would ask you- do you know or remember if you were able to flex [activate'/fire] the glute muscle prior to surgery? A pretty big red flag for myself was realizing prior to surgery when I started exploring various stretching exercises to relive some of the OA pain was that I'd lost most of my capacity to flex the glute muscles and trying to do so caused me pain in my front flexors. Fortunately the surgeries fixed that after a few months of therapy and recovery exercises. Hope your doctor appointment provides an explanation and plan for repair.