What prp injection side effects mean and when to call

What to tell the clinic and when to go now

Tell the clinic if you take aspirin or blood thinners. Mention bleeding trouble, fever, or an active infection.

Also share any doctor-told low platelet count. Platelets are blood cells that help stop bleeding and begin repair.

You'd learn about a low count from a blood test. You aren't expected to know it without a clinician telling you.

Don't change prescribed medicine without asking first. The person who ordered it can guide you.

Bring all your medicine names and mention a past joint infection. These details can delay care when waiting is safer.

Mild soreness and swelling can happen for a short time. Ask what's expected and when it should ease.

Call if redness spreads or the joint becomes hot. Fever, pus, or fast-worsening pain needs prompt care.

A sore, swollen calf also needs a quick check. Don't try to judge that change at home.

Keep the clinic phone number with your care sheet. You'll know whom to call if a symptom changes.

A hot, very sore joint with fever can be urgent. Go now if you also feel very ill.

Get quick help after an injury leaves the joint bent. Go promptly if putting weight on it becomes impossible.

New numbness, foot weakness, or lost bladder control is urgent. Call now instead of waiting for a normal appointment.

Sources

1. The ESSKA-ICRS consensus applied the RAND/UCLA appropriateness method to 216 clinical scenarios for intra-articular PRP in knee OA. Only 84 scenarios (38.9%) were rated appropriate, 9 (4.2%) inappropriate and 123 (56.9%) uncertain. PRP was judged appropriate in patients aged 80 or under with KL grade 0-III osteoarthritis AFTER failed conservative non-injective or injective treatment; it was NOT considered appropriate as a first treatment, nor in KL grade IV (bone-on-bone) osteoarthritis, where 91.7% and 87.5% of scenarios respectively were uncertain.

   Kon E, de Girolamo L, Laver L, et al. — Platelet-rich plasma injections for the management of knee osteoarthritis: The ESSKA-ICRS consensus. Recommendations using the RAND/UCLA appropriateness method for different clinical scenarios. Knee Surgery, Sports Traumatology, Arthroscopy, 2024. DOI: 10.1002/ksa.12320.

2. A systematic review of patient dissatisfaction after total knee arthroplasty found dissatisfaction turned mainly on pre-operative expectations, the degree of improvement in knee function, and pain relief after surgery, with fewer associations in socioeconomic or surgical domains. Joint replacement is a very good operation that does not satisfy everyone, which is why the timing conversation is a real conversation and not a formality.

   Gunaratne R, Pratt DN, Banda J, et al. — Patient Dissatisfaction Following Total Knee Arthroplasty: A Systematic Review of the Literature. The Journal of Arthroplasty, 2017. DOI: 10.1016/j.arth.2017.07.021.

3. A study training predictive models on imaging features found that neither radiographic grading (IRF) nor MRI-based MOAKS scoring predicted patient pain or symptoms in knee osteoarthritis - the best model reached an R-squared of only 0.28, and predictive performance got WORSE as symptoms got more severe. An X-ray grade is not a prediction of how much someone hurts, and it is not on its own a reason to treat or not treat.

   Hill BG, Eble S, Moschetti WE, et al. — The Discordance Between Pain and Imaging in Knee Osteoarthritis. Journal of the American Academy of Orthopaedic Surgeons, 2025. DOI: 10.5435/JAAOS-D-24-00509.

4. The 2019 ACR/Arthritis Foundation osteoarthritis guideline makes STRONG recommendations for exercise, weight loss in people with overweight or obesity, self-management programmes, tai chi, cane use, tibiofemoral bracing, topical and oral NSAIDs and intra-articular glucocorticoid injections for knee OA. Its conditional recommendations cover balance exercises, yoga, CBT, acupuncture, thermal modalities, radiofrequency ablation, acetaminophen, duloxetine and tramadol. Anything offered before a course of the strongly recommended options is being offered out of order.

   Kolasinski SL, Neogi T, Hochberg MC, et al. — 2019 American College of Rheumatology/Arthritis Foundation Guideline for the Management of Osteoarthritis of the Hand, Hip, and Knee. Arthritis & Rheumatology, 2020. DOI: 10.1002/art.41142.

5. A systematic review and meta-analysis of PRP for hip osteoarthritis found intra-articular PRP more effective at time points earlier than three months, with diverse results between 4 and 12 months and only one included study reporting significantly better outcomes for PRP than the comparator. The authors judged PRP possibly beneficial and safe at mid-term follow-up but said its superiority over alternatives such as hyaluronic acid remains unclear.

   Medina-Porqueres I, Ortega-Castillo M, Muriel-Garcia A — Effectiveness of platelet-rich plasma in the management of hip osteoarthritis: a systematic review and meta-analysis. Clinical Rheumatology, 2021. DOI: 10.1007/s10067-020-05241-x.

6. A meta-analysis of six randomized trials (211 PRP patients, 197 hyaluronic acid patients, mean follow-up about 12 months) in hip osteoarthritis found NO significant difference between PRP and hyaluronic acid in weighted improvement on WOMAC, VAS or Harris Hip Score - including in a subanalysis isolating leukocyte-poor PRP.

   Belk JW, Houck DA, Littlefield CP, et al. — Platelet-Rich Plasma Versus Hyaluronic Acid for Hip Osteoarthritis Yields Similarly Beneficial Short-Term Clinical Outcomes: A Systematic Review and Meta-analysis of Level I and II Randomized Controlled Trials. Arthroscopy, 2022. DOI: 10.1016/j.arthro.2021.11.005.