Abstract
Introduction: Posterior tibial tendon dysfunction (PTTD) is a progressive degenerative tendinopathy often unresponsive to conservative care, necessitating surgical interventions with significant postoperative risks. Wharton's jelly (WJ) tissue allograft from the human umbilical cord, with its collagen-rich matrix homologous to tendon tissue, presents a potential alternative intervention. This study aims to report preliminary findings on the safety and efficacy of WJ allografts for the supplementation of degenerated tissue in patients with PTTD. Material and Methods: Twenty-six patients from the observational repository were identified with PTTD (Stages II-IV) and failed at least three months of conservative care. Patients received one or two ultrasound-guided percutaneous applications of the WJ allograft. Outcomes were tracked using the Numeric Pain Rating Scale (NPRS), the Western Ontario and McMaster University Arthritis Index (WOMAC), and the Quality-of-Life Scale (QOLS) at the initial, 30, 90, and 120-day follow-ups. Results: The cohort was 62% male (n = 16) and 38% female (n = 10), with a mean age predominantly in the 70-89 range. From the initial to final visit (90 days for single applications, 120 days for double applications), the single-application group (n = 22) showed a 48.32% improvement in NPRS and a 22.73% improvement in total WOMAC. The double-application group (n = 8) showed a 50% improvement in NPRS and a 27.86% improvement in total WOMAC. A statistically significant improvement in NPRS was observed in the single-application group (p = 0.042). No adverse events were reported. Discussion: This study provides preliminary evidence that WJ tissue allografts may be a safe and effective minimally invasive application for degeneration of the PTT, which is associated with improvements in pain, function, and quality of life. Key limitations include a lack of a control group and a small cohort size. Conclusions: The positive findings of this study warrant further research through randomized controlled trials to confirm efficacy, establish optimal dosage, and compare WJ to other conservative interventions.