Does Intra-Articular Platelet Rich Plasma Injection Improve Meniscal Repair Outcomes?

Background: Meniscal tear surgeries have many long term sequelae. Intra-articular platelet rich plasma injection is thought to stimulate repair and increase meniscal function. Objectives: To assess the effect of 6-monthly intra-articular injection of platelet rich plasma (PRP) on the pain assessment and functional status of knee joint undergone meniscal repair. Methods: A randomized controlled trial was carried out on thirty patients who had undergone arthroscopic meniscal repair and presented with persistent pain within 4 months after surgery. Half of the patients were randomly intra-articularly injected with 5 mL PRP at 1 month intervals for 6 injections and the other half were not injected and taken as a control group. Clinical examination, visual analogue scale (VAS), knee injury and osteoarthritis outcome score (KOOS) score and Doppler ultrasonography were performed before and after PRP treatment. Results: After 6 months, in the PRP injected group, there was a significant improvement in VAS score (1 (1 - 3)) and KOOS score (86.2 4) compared to baseline values (9 (7 - 10) and 62 9.8 respectively; P < 0.001) as well as significant decrease in the percentage of degeneration of medial femoral condyle (MFC), lateral femoral condyle (LFC), medial tibial condyle (MTC), lateral tibial condyle (LTC) measured by Doppler Ultrasonography (US), (6.163.33 and 9.073.66, respectively; P = 0.031). Conclusions: This study showed that intra-articular PRP injection following meniscal repair can be effective in reducing pain, improving knee function, and slowing the rate of cartilage degeneration that accounts for early osteoarthritis.