Allegro’s osteoarthritis injectable shock absorbing device demonstrates preclinical safety

Allegro updated this press release on April 20, 2026, to refine certain statements in accordance with regulatory guidelines 

Liege, Belgium – 11 December 2024 (07:30 CET) – Allegro NV, a biomedical company developing transformative nanotechnology-based devices for degenerative joint disease, today announced that its injectable microparticle gel, hydrocelin, has demonstrated favorable safety in two preclinical studies. The gel contains cross-linked microparticles that act as tiny shock absorbers in the synovial fluid. This reduces the mechanical force to provide pain relief and to protect cartilage. Allegro intends to advance hydrocelin into multi-center pivotal clinical studies in osteoarthritis patients in 2025. 

“Effective disease-modifying devices for osteoarthritis are urgently needed as our population ages, as well as for athletes who are looking for alternative to invasive surgical procedures. These preclinical safety results for hydrocelin are encouraging and we plan to release additional in vivo safety and efficacy data over the coming months as we work to initiate the first clinical trials in humans next year,” said Lucas Decuypere, CEO of Allegro. “We believe hydrocelin possesses the necessary attributes to offer osteoarthritis patients pain relief and potentially protect joints and restore mobility.” 

In the first preclinical safety study, hydrocelin was injected in knee joints of mice, while a phosphate-buffered saline solution was used as negative control. The mice were observed daily for behavioral and physical changes and monitored for clinical effects over 4 weeks; a histological analysis of the treated joints was performed at the end of the study. In a second acute systemic toxicity study, half of subjects received an intraperitoneal injection of hydrocelin, while the other half received sodium chloride as control, and were observed for 72 hours. The data showed no negative observations across a wide range of indicators, including overall behavior, gait, knee stiffness, body weight, fur condition, histological properties of the joint, and mortality. 

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