Corticocancellous bone biopsy from the 12th rib of standing horses.

The study explored obtaining bone biopsy samples from the 12th rib of standing horses, with findings suggesting the larger sized and transcortical samples yielded more cancellous bone. Despite some short-term complications, no long-term issues were observed.

Study Methodology

• The research involved taking unicortical corticocancellous bone biopsy specimens from the 12th rib of eight horses while standing. This was achieved using different diameter measures, 4.5 mm and 6.5 mm.
• In addition, further in vitro tests were performed. These compared the biopsy specimens of 6.5 mm and 12 mm in diameter, as well as unicortical and transcortical biopsy specimens.
• Another aspect of the study was obtaining transcortical bone biopsy specimens that were 12 mm in diameter from eight horses. This was achieved with the use of power-assisted trephination.

Study Findings

• Although samples were successfully taken from the 12th rib of the standing horses, the bone specimens proved inappropriate for subsequent histologic or histomorphometric evaluation.
• In the in vitro comparisons, the 12 mm transcortical specimens provided the most cancellous bone, a variety considered valuable in such studies.
• The surgical procedure to obtain the samples was well-tolerated by the horses. However, all horses experienced some degree of pneumothorax (abnormal collection of air in the chest cavity that can cause lung collapse), which was treated by air aspiration from the thorax. Despite this short-term complication, no long-term complications were observed in any of the subjects.

Implications of the Research

• The research shed light on the feasibility of taking unicortical corticocancellous bone biopsy specimens from standing horses. Although successful, the nature of the specimens makes them unsuitable for certain evaluations.
• The study gives insights into which samples yield higher amounts of cancellous bone, with indications that larger sized and transcortical samples are superior.
• The research also highlighted the potential short-term complication of pneumothorax when taking such samples from the rib area. It’s important to note that despite this, the procedure was well-tolerated, and no long-term complications were observed. Hence, with proper management, this method of obtaining samples could still be viable.