How effective is PRP injection for hamstring strain?

PRP is prepared from a sample of your own blood and placed near the injured hamstring tissue. The aim is to support the local healing environment. It cannot rejoin a completely detached tendon or instantly restore strength. A clinician first considers the injury location, severity, timing, examination findings and activity goals. A mild muscle strain and a tendon-related injury may not respond in the same way. Soreness after the injection can temporarily change how you walk or exercise, so the early plan needs to protect the area while movement is reintroduced.

Ask for a clear diagnosis before choosing an injection. Rehabilitation commonly progresses from comfortable movement to controlled hamstring loading, then to faster running and sport-specific drills. Your physiotherapist may adjust stretching, strengthening and return-to-running work according to pain, flexibility and strength. Follow instructions about pausing anti-inflammatory medicines or strenuous activity only if your treating clinician gives them. PRP details such as preparation, injection site and whether repeat treatment is considered should be discussed in advance. More information is available in the [PRP Injection](/treatments/non-surgical-orthopedics/prp-injection/) guide.

Arrange an assessment promptly for a sudden pop, marked bruising, a visible dip in the back of the thigh, substantial weakness, numbness, or difficulty bearing weight. After an injection, contact the treating service for increasing redness, warmth, drainage, fever, rapidly worsening pain or new leg swelling. These signs need examination rather than assumption that they are part of normal recovery.

Which structure is injured, and how severe is the strain? What improvement would count as meaningful for my activity? How will the injection fit with physiotherapy, and what should I avoid beforehand and afterward? When should strength and running be reassessed?