When Is PRP Injection Recommended for Knee Osteoarthritis?

Knee osteoarthritis affects the joint surfaces and may cause pain with walking, stiffness after rest, swelling or reduced confidence on stairs. A clinician checks whether these symptoms fit osteoarthritis and considers alignment, movement, strength, activity goals and other causes of knee pain. PRP uses concentrated components from your own blood and is injected into the joint. It may reduce symptoms for some people, but it cannot rebuild worn cartilage or stop every change in the joint.

Start with an assessment rather than choosing an injection from symptoms alone. Keep a short record of walking tolerance, swelling, sleep disruption and activities you want to resume. A plan may combine strengthening, aerobic exercise, weight-management support when relevant, activity pacing and pain relief chosen with a clinician. If PRP is offered, clarify the expected time course, aftercare, medication adjustments and how success will be judged. See [Knee Osteoarthritis](/conditions/knee-osteoarthritis/) and [PRP Injection](/treatments/non-surgical-orthopedics/prp-injection/).

Get prompt care for a knee that is suddenly very swollen after an injury, hot and red with fever, visibly deformed, or unable to bear weight. A knee that repeatedly locks or gives way also deserves assessment. These signs can require a different response from planned osteoarthritis treatment, so postpone an elective injection until the cause is clear.

How advanced is the osteoarthritis and what else could be causing my symptoms? Which exercise plan matches my knee? What improvement is realistic to measure? What are the alternatives to PRP for my goals? Which medicines or health conditions should be discussed before injection?