Ventral approach for stabilization of atlantoaxial subluxation secondary to odontoid fracture in a foal.

The research paper discusses the successful treatment of a 30-day-old foal suffering from atlantoaxial subluxation, a condition caused by an odontoid fracture. The unique approach of the research was the usage of two ventrally placed dynamic compression plates for alignment and stabilization of the atlantoaxial joint. The gait became normal one year after surgery, suggesting the effectiveness of the novel approach.

Research Context and Purpose

• The study revolves around a case of atlantoaxial subluxation in a foal due to an odontoid fracture. Atlantoaxial subluxation is an abnormal spacing between the first two vertebrae in the neck, the atlas and the axis, usually as a result of trauma or birth deformities. The odontoid fracture in this case refers to a break in a part of the second neck vertebra, known as the odontoid process.
• The purpose of the research was to correct this subluxation and stabilize the atlantoaxial joint in the foal. The researchers were interested in assessing the efficacy and safety of a novel technique involving ventral placement of dynamic compression plates.

Methodology and Outcome

• The researchers performed a surgery aligning the atlantoaxial joint and stabilizing it with two ventrally placed dynamic compression plates. ‘Ventral’ refers to the front or belly side of the animal, indicating the approach for the surgery.
• The research involved follow-ups at 90 days and 1 year post-surgery. At the 90-day mark, radiographs confirmed healing of the fracture and the adequate alignment of the atlantoaxial joint. The foal was slightly tetraparetic, exhibiting slight weakness in all four limbs.
• One year after the surgery, the foal showed a normal gait, indicating successful treatment.

Research Conclusions

• The researchers concluded that their ventral approach is advantageous compared to the traditional use of Steinmann’s pins or external coaptation for stabilization.
• This approach allows for effective decompression, anatomic alignment, and immediate stabilization of the subluxation.
• However, they noted potential complications such as laryngeal paralysis.