PMID- 34461219 OWN - NLM STAT- MEDLINE DCOM- 20220310 LR - 20220311 IS - 1526-3231 (Electronic) IS - 0749-8063 (Linking) VI - 38 IP - 3 DP - 2022 Mar TI - Estimated Time to Maximum Medical Improvement of Intra-articular Injections in the Treatment of Knee Osteoarthritis-A Systematic Review. PG - 980-988.e4 LID - S0749-8063(21)00777-5 [pii] LID - 10.1016/j.arthro.2021.08.026 [doi] AB - PURPOSE: The purpose of the current study is to perform a systematic review of the literature and evaluate maximum medical improvement and minimal clinically important difference (MCID) of different injectables in the treatment of symptomatic knee osteoarthritis. METHODS: A systematic review was performed to evaluate maximum medical improvement and MCID in patients undergoing injections of different modalities for knee osteoarthritis. Demographic factors of the patients being reviewed were analyzed, with patient-reported outcomes as reported by visual analog scale (VAS) and Western Ontario and McMaster Universities Arthritis Index (WOMAC) being used to evaluate the clinical trajectory of patients receiving intra-articular injections. RESULTS: Overall, 79 (level of evidence I: 79) studies met inclusion criteria, with 8761 patients. Corticosteroid (CS) injections, middle molecular weight hyaluronic acid (MMW-HA), and leukocyte-rich platelet rich plasma (LR-PRP) injections reached their maximum pain control at 4 to 6 weeks after injection, as measured by VAS. The lowest VAS scores were reached for low molecular weight hyaluronic acid (LMW-HA), high molecular weight hyaluronic acid (HMW-HA), and leukocyte-poor platelet rich plasma (LP-PRP) by 3 months after injection. Similarly, the WOMAC scores were lowest at 4 to 6 weeks after CS and MMW-HA injections, and at 3 months after HMW-HA and LP-PRP injections. LR-PRP demonstrated the most prolonged pain relief relative to the other injection types, with the lowest VAS score of all groups measured at final follow-up. LP-PRP showed the lowest WOMAC scores at final follow-up, one year post-injection. CONCLUSION: PRP injections provide continued pain relief at up to 1 year after injection. Corticosteroids and hyaluronic acid have good efficacy and are suitable for many patients but lack this longevity. LEVEL OF EVIDENCE: Level I, a systematic review of Level I studies. CI - Copyright (c) 2021 Arthroscopy Association of North America. Published by Elsevier Inc. All rights reserved. FAU - Mojica, Edward S AU - Mojica ES AD - New York University Langone Health, Department of Orthopaedic Surgery, New York, New York, U.S.A. FAU - Markus, Danielle H AU - Markus DH AD - New York University Langone Health, Department of Orthopaedic Surgery, New York, New York, U.S.A. FAU - Hurley, Eoghan T AU - Hurley ET AD - New York University Langone Health, Department of Orthopaedic Surgery, New York, New York, U.S.A.. Electronic address: eoghanhurley@rcsi.ie. FAU - Blaeser, Anna M AU - Blaeser AM AD - New York University Langone Health, Department of Orthopaedic Surgery, New York, New York, U.S.A. FAU - Jazrawi, Laith M AU - Jazrawi LM AD - New York University Langone Health, Department of Orthopaedic Surgery, New York, New York, U.S.A. FAU - Campbell, Kirk A AU - Campbell KA AD - New York University Langone Health, Department of Orthopaedic Surgery, New York, New York, U.S.A. FAU - Strauss, Eric J AU - Strauss EJ AD - New York University Langone Health, Department of Orthopaedic Surgery, New York, New York, U.S.A. LA - eng PT - Journal Article PT - Review PT - Systematic Review DEP - 20210827 PL - United States TA - Arthroscopy JT - Arthroscopy : the journal of arthroscopic & related surgery : official publication of the Arthroscopy Association of North America and the International Arthroscopy Association JID - 8506498 RN - 9004-61-9 (Hyaluronic Acid) SB - IM MH - Humans MH - Hyaluronic Acid MH - Injections, Intra-Articular MH - *Osteoarthritis, Knee/drug therapy MH - *Platelet-Rich Plasma MH - Treatment Outcome EDAT- 2021/08/31 06:00 MHDA- 2022/03/11 06:00 CRDT- 2021/08/30 20:13 PHST- 2021/04/04 00:00 [received] PHST- 2021/08/09 00:00 [revised] PHST- 2021/08/11 00:00 [accepted] PHST- 2021/08/31 06:00 [pubmed] PHST- 2022/03/11 06:00 [medline] PHST- 2021/08/30 20:13 [entrez] AID - S0749-8063(21)00777-5 [pii] AID - 10.1016/j.arthro.2021.08.026 [doi] PST - ppublish SO - Arthroscopy. 2022 Mar;38(3):980-988.e4. doi: 10.1016/j.arthro.2021.08.026. Epub 2021 Aug 27.