Anyone familiar with PRP injections?

My son has had elbow discomfort and we got an MRI done. Orthopedic said he had a ‘partial thickness tear”, said we can just try to rest and Physical therapy for 4-5 weeks, get a PRP injection and do 6-8 weeks recovery and Physical therapy with about 4 weeks return to throw program and should be ready for the season. Of course the last option would be good ol TJ. Question is has anyone had any experience or know anything about PRP injections in terms of recovery time from them, performance after, or anything else?