Corticosteroid injections and LDRT address osteoarthritis pain through different mechanisms and on different timescales. Cortisone acts in days and lasts 4–12 weeks. LDRT takes 4–12 weeks to develop effect and may last 6–24 months from a single course. For many patients these treatments are complementary, not competing.
The corticosteroid evidence base is strong and sham-controlled. Jüni P et al. (Cochrane, 2015) analyzed 27 trials of intra-articular corticosteroids versus sham or no treatment. Pooled effect at 1–2 weeks: SMD −0.40 (moderate, clinically meaningful). NNT approximately 8 for a clinically meaningful pain response versus sham. GRADE evidence quality: Low to Moderate for pain (primarily due to risk of bias and inconsistency). Benefit at 3–6 months: uncertain and generally small, consistent across trials. Bensa M et al. (2024) — 11 sham-controlled trials of IACS versus placebo injection: MCID exceeded for pain and function at short-term (1–6 weeks). Most sham-controlled trials show benefit fades toward no difference by 6 months.
McAlindon TE et al. (JAMA, 2017): double-blind, placebo-controlled RCT, n=140, triamcinolone 40 mg every 12 weeks vs saline for 2 years. Cartilage volume loss: −0.21 mm (triamcinolone) vs. −0.10 mm (saline), p=0.01. Pain scores at 2 years: no significant difference. What this shows: with 8 injections over 2 years on a Q12-week schedule, triamcinolone produced measurable additional cartilage loss with no compensating pain benefit at that endpoint. What this does not show: harm from one injection, or harm from a Q6-month schedule widely used in practice. The trial used an aggressive frequency. This is the study most often cited to raise concern about high-frequency repeat use — the concern is real and the data are genuine, but the implication is not that a single injection is harmful.
Corticosteroids have a strong short-term sham-controlled evidence base that very few OA treatments can match. A single or infrequent injection has a well-established benefit. LDRT itself is not a substitute for the acute relief a corticosteroid injection can provide in days.
Cortisone: relief in days; duration typically 4–12 weeks per Cochrane synthesis. LDRT: 4–12 weeks to effect; duration 6–24 months in most responders. The Makarova 2025 10-year follow-up suggests possible structural benefit with LDRT.
Corticosteroid injection: acute/subacute flares; rapid relief needed; periodic use without heavy injection history. LDRT: chronic refractory OA after multiple prior injections; patients where frequent steroid use is a concern (diabetes, cartilage concern); patients seeking longer-lasting relief from a single course.
A corticosteroid injection can bridge the 4–12 week period while LDRT takes effect. There is no known contraindication to sequential use. The choice belongs to the patient and their physician.
Related: All treatment comparisons | Am I a candidate? | Cost and coverage
Medically reviewed by: Robert Warren Floyd, M.D., Ph.D. — Resident Physician, Radiation Oncology, The University of Texas MD Anderson Cancer Center. Last reviewed: August 2, 2026. Independent personal project — not affiliated with or endorsed by MD Anderson Cancer Center. Funding & independence disclosure.