Artificial joint replacements can drastically change a patient’s quality of life. Arthritic knees, shoulders and hips can be replaced with state-of-the-art metal or ceramic implants, eliminating pain and giving a person a new lease on life.
But, what if, instead of metal and plastic, doctors were able to take a patient’s cells and grow an entirely new, fully functional biological joint? A team of University of Missouri and Columbia University researchers have found a way to create these biological joints in animals, and they believe biological joint replacements for humans aren’t far away.
In a study published this fall in The Lancet, James Cook, a researcher in the MU College of Veterinary Medicine and Department of Orthopaedic Surgery, participated on a research team that created new cartilage in animals using a biological “scaffold” in the animals’ joints. Cook assisted with the implant design and performed the surgeries to implant the biologic joint replacements. The study was led by Jeremy Mao of Columbia University.
The scaffold was implanted in rabbits with a surgical technique used for shoulder replacement in humans. The surgery removes the entire humeral head, or the ball part of the ball-and-socket shoulder joints. The scaffolds are infused with a growth factor, which encourages the host’s own cells, including stem cells, to become cartilage and bone cells.
“The device was designed with both biological and mechanical factors in mind,” Cook said. “It is unique in design and composition and in how it stimulates the body’s own cells. This is the first time we have seen cartilage regeneration using this type of scaffold. ”
The study found that the rabbits given the infused scaffolds resumed weight-bearing and functional use of their limbs faster and more consistently than those without. Four months later, cartilage had formed in the scaffolds creating a new, functional cartilage surface for the humeral head. The team observed no complications or adverse events after surgery.
Cook said the next step toward FDA approval and clinical use is to study the technique in larger animals.
“If we continue to prove the safety and efficacy of this biologic joint replacement strategy, then we can get FDA approval for use of this technology for joint replacements in people,” Cook said.