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The primary objective of this study is to report the initial efficacy data observed with the use of cryopreserved human umbilical tissue allografts for supplementation in patients with symptomatic degeneration of load-bearing articular cartilage in the knee joint. Our primary endpoints were pain, stiffness, and functional recovery scores. In this ongoing study, 55 participants (age 56–93 years) received a single Wharton’s jelly tissue allograft application. The study dose consisted of 150 mg of Wharton’s jelly allograft suspended in approximately 2 mL of sterile sodium chloride 0.9% solution (normal saline). Each study knee application was performed under ultrasound guidance in a physician’s office. The research methodology consisted of Numeric Pain Rating Scale (NPRS) scores and Western Ontario and McMaster Universities Osteoarthritis Index (WOMAC) subsection scores including pain, stiffness, and physical function. Study enrollment consisted of 55 patients followed for a post-application duration of 90 days. No adverse events or adverse reactions were reported. The results demonstrated statistically significant improvements of NPRS and WOMAC in initial versus 90-day examination. The data represent Wharton’s jelly tissue allograft applications are safe, non-surgical, and efficacious for patients with symptomatic osteoarthritis of the knee.