Could be anything GPP or not

Feel Free to introduce yourself and ask a question when you join! will be getting more active in here today and posting some stuff of my own

Hi all Apologies in advance if this isn't the type of question to ask here, but I guess it fits in with my current training and is a pretty sports specific issue, so may help others here. I've been struggling with what I believe is Patella Tendinopathy for approx six months. I've followed Jake Tuura's recommendations (I bought his program) and although at times it seemed to relieve the pain, I'm still at a stage where I can't engage my right quad (literally cannot tense it) and as soon as I go anywhere near parallel, there is just no strength there and my knee just fails and I have to bail out of the movement. Side info: I have Rheumatoid Arthritis, and go in for infusions every year to be able to keep going. Last year was the first time in 10 years (diagnosed at 27) that I felt well enough to start playing basketball again, so I joined a local team and had an amazing first season. Come the end of the season, I've ended up with this problem, so I'm currently taking time off in pre-season, hoping to resolve it for starting the season again in September. Has anybody gone through a similar issue and managed to resolve it? I run a pretty simple leg program that involves the isometric recommendations for PT, along with the usual squat variations, hamstring curls, calf, glutes. Look forward to reading any replies. Thanks for creating this Angus, it's such a great idea to get genuine conversation going 👍