Rabbit Fractured Lumbar Spine Study Guide

Overview and Clinical Importance

Fractured lumbar spine in rabbits represents one of the most devastating traumatic injuries encountered in exotic animal practice. This condition commonly occurs at the seventh lumbar vertebra (L7) due to the unique anatomical structure of rabbits, combining powerful hindlimb musculature with relatively fragile skeletal architecture. Understanding the pathophysiology, diagnosis, and management of this condition is essential for NAVLE success, as it tests knowledge of small mammal anatomy, emergency medicine, neurology, and client communication.

Anatomical Considerations

Skeletal Structure

Rabbits have remarkably fragile skeletons, with bones comprising only 7-8% of total body mass compared to approximately 13% in cats and dogs. This delicate skeletal structure makes rabbits particularly vulnerable to fractures, especially when combined with their powerful hindlimb musculature which can account for up to 50% of body mass.

The typical rabbit has 12-13 thoracic vertebrae and 6-7 lumbar vertebrae. The most common vertebral formulas are: C7/T12/L7/S4 (76.4%), C7/T12/L6/S4 (3.3%), and C7/T13/L7/S4 (2.4%).