Pain relief typically initiates 2–4 weeks post-injection and plateaus by 8–12 weeks. Duration is highly variable: 30–40% of responders sustain benefit for 12–18 months; others experience gradual symptom return by 6–9 months. A subset requires repeat injections annually to maintain gains. Structural cartilage changes, if present, appear durable longer than symptomatic benefit. No evidence to date indicates permanent reversal of OA; symptom amelioration rather than cure is the realistic expectation.
Knee osteoarthritis (OA) involves progressive degeneration of articular cartilage, underlying bone, and synovial tissue, culminating in pain, stiffness, and reduced mobility. Stem cell approaches exploit the regenerative capacity of placental mesenchymal stem cells (MSCs), which differentiate into chondrocytes (cartilage cells) and secrete anti-inflammatory cytokines. Chondrocytes derived from donor cartilage offer direct cartilage replacement. Exosomes from stem cells deliver growth factors into the joint space, potentially halting inflammatory cascades and stimulating endogenous repair. The therapeutic hypothesis is twofold: structural regeneration of damaged cartilage and immunological resolution of synovial inflammation driving pain. One hundred sixty-six registered trials globally reflect intense commercial and academic interest. Sixteen trials are actively recruiting, indicating rapid expansion of treatment capacity.
Am I a candidate? → · Knee Osteoarthritis: full overview → · Knee Osteoarthritis cost → · Cost →
Medically reviewed by StemCellAtlas’s editorial team with Dr Tymur Lukyanenko (Orthopaedic Traumatologist · 20+ yrs clinical, 15+ yrs cell therapy) of partner clinic Stem Plus (Sofia), against ISSCR, FDA & EMA guidance. Educational information, not medical advice; figures indicative.
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