Injections into the hip joint are difficult because this joint is not as accessible as the knee joint. That's why you'll see a lot more written about knee injectables than hip injectables. Hip injections need to be done with imaging guidance.

With that said, platelet rich plasma injection therapy is being utilized although it is not been really well studied. Yes, there are single case studies of success in this athlete's knee or that rabbit's joint. One study examined a larger group of people with bad knees and divided them into three groups. One group received three PRP injections. Another group recieved high molecular weight viscosupplementation and the final group got three injections of low molecular weight viscosupplementation. Interestingly, the PRP did better than the other two groups. And not surprising, the youngest people with the least amount of arthritis did the best.

So if you are young, with some money to burn (insurance won't cover this treatment), and have a minimal amount of arthritis, then a PRP injection into the hip might help. But considering you are already into the "very painful", "very constricting" phase, PRP probably won't change your life.

Arthroscopy. 2011 Nov;27(11):1490-501

Dr. Christina Lasich, MD