How long does PRP injection take to work for patellar tendinitis?

The injection is intended to support the tendon’s repair environment; it is not a pain medicine that switches symptoms off immediately. Soreness around the kneecap can briefly increase after treatment. Early changes may be subtle, such as tolerating stairs or a controlled squat more comfortably, before jumping and running feel easier.

Patellar tendinitis, also called patellar tendinopathy, is affected by the tendon’s workload. Pain can improve unevenly if sport, stairs, or deep knee bending are increased too quickly. Your clinician may use examination findings and functional tasks to judge progress rather than relying on pain on one day.

Follow the injection team’s advice about rest, icing, medicines, and driving. Avoid testing the knee with jumping, sprinting, or heavy leg work while it is irritable. Resume prescribed loading gradually: rehabilitation commonly starts with tolerable movements and progresses toward strengthening, landing control, and sport-specific activity.

Keep a simple record of pain, stiffness, and activities that trigger symptoms. This helps your physiotherapist adjust the load. Read more about [Patellar Tendinitis](/conditions/patellar-tendinitis/) and the procedure in [PRP Injection](/treatments/non-surgical-orthopedics/prp-injection/).

Contact your treating team if pain keeps intensifying, the injection site becomes increasingly red or hot, drainage appears, or you develop fever. Seek urgent assessment for marked calf swelling, new shortness of breath, inability to bear weight, or a sudden knee injury with a popping sensation and loss of function.

Ask which activities to pause, when rehabilitation should begin, how progress will be measured, and what amount of post-injection soreness is expected. Confirm which pain medicines are suitable and when you should return if improvement has not started.