This week’s case involves the musculoskeletal system, which everyone usually feels like they need more practice with. Here we have a 2-month-old female Pit Bull mix with angular limb deformities since birth. What is your diagnosis?
Right thoracic limb: There is luxation of the elbow joint with no articulation between the radius, ulna, and humerus. The humerus is rotated medially relative to the distal thoracic limb. The first digit originates on the medial aspect of the mid radius and ulna. Digits 2-5 are in a normal position however the second digit is shortened. The phalanges have angular malformations.
Left thoracic limb: There is division of the radius and ulna at the level of the luxated elbow joint. The radius has several carpal bones and a single digit attached. The ulna has a proximal curved malformation, and there are two metacarpal bones and digits distally.
- Bilateral thoracic limb ectrodactyly
- Congenital elbow joint luxation