When should a sore joint be checked?

Which signs mean I need help right away?

Fever along with one swollen, very hot joint can be a sign of infection. New redness, fluid leaking from the skin, or fast-rising soreness after a procedure also needs prompt care. If you feel ill with these signs, seek help instead of waiting for a booked visit.

Get urgent help after a fall if a joint stays bent, locks, or can't hold your weight. Sudden weakness or numbness needs quick care, as does losing control of your bladder or bowels. A swollen calf after sitting still may be a blood clot.

Urgent trouble needs a diagnosis before any planned joint procedure.

When might a blood-based procedure be wrong for me?

A blood-based procedure may not fit if you expect new cartilage or a certain result. It may make little sense before basic strength work has been tried. Severe wear, a joint with a different shape, or frequent buckling may mean surgery needs discussion instead.

Tell the doctor about blood thinners, bleeding trouble, an infection, or any illness or medicine that makes it hard for your body to fight germs. If clinic staff ask you to pause a blood thinner, first call the doctor who prescribed it.

Sometimes the safest choice is no procedure.

What happens during the visit?

Take recent X-rays if you have them, along with an up-to-date medicine list. Tell the examiner what first brought on the soreness and which daily tasks now hurt. The visit may include checks of movement, muscle power, swelling, and sore areas. More testing is sometimes needed.

QC Kinetix has medical providers, meaning clinic staff who examine you, discuss regenerative treatments made by processing blood taken from you. They can explain why other care might suit you better.

Leave with plain answers about the likely cause, your choices, and the full price.

Sources

1. A 2026 systematic review and meta-analysis of 28 randomized trials of intra-articular mesenchymal stem cell-based therapies in knee OA found significant improvements in several pain and function measures (delta-VAS MD -1.67; KOOS pain MD 15.37) but NO significant difference in WOMAC, KOOS quality of life or the Lequesne index, and MRI-based WORMS scores were non-significant - indicating no consistent structural benefit. Its own conclusion: these therapies serve a primarily SYMPTOM-modifying rather than STRUCTURE-modifying role, with higher frequencies of local reactions to weigh against the symptomatic benefit.

   Awad G, et al. — Efficacy and safety of intra-articular mesenchymal stem cell-based therapies in knee osteoarthritis: A systematic review and meta-analysis of randomized controlled trials.. Clinical rheumatology, 2026. DOI: 10.1007/s10067-026-08042-w.

2. A GRADE-rated systematic review and meta-analysis of 16 randomized trials (807 participants) found that MSC therapy for chronic knee OA pain PROBABLY RESULTS IN LITTLE TO NO DIFFERENCE in pain relief at 3-6 months (WMD -0.74 cm on a 10 cm VAS against a minimally important difference of 1.5 cm) or physical functioning (WMD 2.23 on the SF-36 100-point subscale against a 10-point MID), both moderate certainty; at 12 months pain was again probably little-to-no-different (WMD -0.73 cm). The measured effect is real but sits BELOW the threshold at which a patient would notice it.

   Sadeghirad B, et al. — Mesenchymal stem cells for chronic knee pain secondary to osteoarthritis: A systematic review and meta-analysis of randomized trials.. Osteoarthritis and cartilage, 2024. DOI: 10.1016/j.joca.2024.04.021.

3. The RESTORE trial - a participant-, injector- and assessor-blinded RCT of 288 adults aged 50+ with symptomatic medial knee OA (Kellgren-Lawrence 2-3) - compared three weekly intra-articular PRP injections against saline placebo, with co-primary endpoints of 12-month knee pain and medial tibial cartilage volume on MRI. PRP did not beat placebo on either. It is the single best-designed test of the specific claim that PRP changes joint structure, and it was negative.

   Bennell KL, et al. — Effect of Intra-articular Platelet-Rich Plasma vs Placebo Injection on Pain and Medial Tibial Cartilage Volume in Patients With Knee Osteoarthritis: The RESTORE Randomized Clinical Trial.. JAMA, 2021. DOI: 10.1001/jama.2021.19415.

4. A four-arm, multicentre, single-blind phase 2/3 randomized trial of 480 knee OA patients (KL II-IV) compared autologous bone marrow aspirate concentrate, autologous adipose stromal vascular fraction and allogeneic umbilical-cord-tissue mesenchymal stromal cells against a corticosteroid injection control. At 12 months NONE of the three orthobiologic injections was superior to another, or to the corticosteroid control, and none of the four groups showed a significant change in MRI osteoarthritis score from baseline. No procedure-related serious adverse events occurred.

   Mautner K, et al. — Cell-based versus corticosteroid injections for knee pain in osteoarthritis: a randomized phase 3 trial.. Nature medicine, 2023. DOI: 10.1038/s41591-023-02632-w.

5. The AAOS clinical practice guideline summary on SURGICAL management of knee osteoarthritis - the other end of the ladder, and the honest comparator for anyone told a biologic injection will let them avoid an operation.

   Srivastava AK, et al. — American Academy of Orthopaedic Surgeons Clinical Practice Guideline Summary of Surgical Management of Osteoarthritis of the Knee.. The Journal of the American Academy of Orthopaedic Surgeons, 2023. DOI: 10.5435/JAAOS-D-23-00338.

6. A CDC-led national public health investigation identified culture-confirmed bacterial infections in 20 patients (median age 63) across 8 US states who received umbilical cord blood-derived products marketed as stem cell treatment for pain, osteoarthritis, rheumatoid arthritis and injury. ALL BUT ONE REQUIRED HOSPITALISATION. Of unopened, undistributed product vials sampled, 65% (22 of 34) were contaminated with at least one of 16 bacterial species, mostly enteric; whole-genome sequencing linked an Arizona patient isolate to product administered in Florida.

   Hartnett KP, et al. — Investigation of Bacterial Infections Among Patients Treated With Umbilical Cord Blood-Derived Products Marketed as Stem Cell Therapies.. JAMA network open, 2021. DOI: 10.1001/jamanetworkopen.2021.28615.

7. The Cochrane review of exercise for knee osteoarthritis found high-quality evidence that land-based therapeutic exercise provides short-term benefit in pain and physical function, sustained for at least 2-6 months after the programme ends, with mild transient soreness the only reported adverse effect across 45 trials. It is the best-evidenced treatment for this condition and it costs nothing per injection.

   Fransen M, et al. — Exercise for osteoarthritis of the knee.. The Cochrane database of systematic reviews, 2015. DOI: 10.1002/14651858.CD004376.pub3.

8. A randomized trial in the New England Journal of Medicine compared physical therapy against intra-articular glucocorticoid injection for knee osteoarthritis and found physical therapy produced better WOMAC outcomes at one year. When a clinic offers an injection, the comparator that matters is not 'nothing' - it is a course of supervised exercise.

   Deyle GD, et al. — Physical Therapy versus Glucocorticoid Injection for Osteoarthritis of the Knee.. The New England journal of medicine, 2020. DOI: 10.1056/NEJMoa1905877.