Incorporation of fresh and cryopreserved bone in osteochondral autografts in the horse.

The research paper is a study on the structural integrity of fresh and cryopreserved bone in osteochondral autografts in horses. It found that both fresh and frozen grafts provided solid support for the cartilage surface, although fresh grafts were more actively remodeling by month 3.

Study Design and Procedure

• The researchers conducted their study on 10 anesthetized horses. From each horse, they collected two osteochondral autografts from the lateral aspect of the lateral trochlear ridge of the left talus.
• The harvested grafts were then frozen in 7.5% DMSO to create cryopreserved (or frozen) grafts. They were kept frozen for 14 days before being thawed for implantation.
• After thawing, these cryopreserved grafts were press-fitted into accurately measured drill holes in the trochlear ridges of the horses’ right stifles.
• Simultaneously, a fresh graft was taken from the right hock of each horse and implanted into their left stifle.
• As a control measure, fresh grafts were also transferred from the right stifle to the left stifle to monitor any effects that might be specifically tied to the surgical procedure itself and not the transplant type.

Results of the Study

• The study found that by the third month, both fresh and frozen grafts had structurally maintained their integrity, effectively supporting the surface of the cartilage.
• Graft stability and the degree of surface congruency were identified as key determining factors in the success of the grafts. This emphasizes the need for precise fitting and placement of the grafts during surgery.
• Although both types of graft were fully integrated by the third month, there was more active remodeling observed in the fresh grafts. This suggests that fresh autograft transplants may respond more adaptively in a biological sense, potentially enhancing the success of joint reconstruction.