Many studies have shown the effectiveness of platelet-rich plasma (PRP) in the treatment of knee osteoarthritis. We aimed to determine the factors associated with good or poor response to PRP injections in knee osteoarthritis. This was a prospective observational study. Patients with knee osteoarthritis were recruited from a university hospital. PRP was injected twice at a one-month interval. Pain was assessed on a visual analog scale (VAS) and function was assessed using the Western Ontario and McMaster Universities Osteoarthritis Index (WOMAC). Radiographic stage was collected and defined according to the Kellgren–Lawrence classification. Patients were classified as responders if they met the OMERACT-OARSI criteria at 7 months. We included 210 knees. At 7 months, 43.8% were classified as responders. Total WOMAC and VAS were significantly improved between M0 and M7. Physical therapy and a heel–buttock distance >35 cm were the two criteria associated with poor response at M7 by multivariate analysis. Pain VAS at M7 appeared to be lower in patients with osteoarthritis for less than 24 months. No adverse effects were reported. PRP treatment in knee osteoarthritis appears to be well-tolerated and effective, even in patients who reacted poorly to hyaluronic acid. Response was not associated with radiographic stage.

Background/Objectives: Virtual reality (VR) has been shown to reduce pain and anxiety in several specialties, but has not been investigated in the setting of steroid injections in rheumatology. We aimed to assess the impact of using a VR headset on pain and anxiety during epidural steroid injection via the sacral hiatus for lumbar radiculopathy. Methods: Patients received two injections via the sacral hiatus and were randomized into one of two groups: group 1 used the VR headset during the first injection and not during the second injection, while group 2 used the VR headset during the second injection but not the first. The primary endpoint was pain evaluated on a numeric rating scale. Secondary objectives were anxiety, measured using the STAI (State Trait Anxiety Inventory), and safety. These analyses were performed using the Mann–Whitney U test. Results: We included 116 patients over 18 years of age who were hospitalized in the Rheumatology department of the University Hospital of Reims and scheduled to receive at least two epidural steroid injections. We observed a significantly lower pain score during the first injection procedure (median 3 (IQ 1; 6) in group 1 vs. 5 (IQ 3; 7) in group 2, p = 0.045). The analysis for the second injection could not be performed by intention-to-treat due to the presence of a sequence effect. There was also a significant reduction in anxiety (p = 0.004 and p = 0.002 by per-protocol analysis). Conclusions: VR can significantly reduce pain and anxiety during epidural steroid injection via the sacral hiatus.