Bilateral luxation of the coffin joints in a horse, as a sequel to palmar neurectomy.

This study details the complications experienced by a 16-year-old mare following a palmar neurectomy, leading to the luxation (dislocation) of its coffin joints and severe joint damage, after which it had to be euthanized.

Introduction and Case Description

• The study revolves around the case of a 16-year-old mare that suffered a complete rupture of its deep flexor tendons and coffin joint ligaments, leading to the dislocation of both coffin joints. This arose as a complication following a surgical procedure known as palmar neurectomy (removal of a specific nerve).

Palmar Neurectomy and Potential Complications

• Palmar neurectomy is a veterinary procedure usually carried out on horses to alleviate chronic lameness by removing a section of nerve that transmits pain signals from the lower leg. Though it can relieve pain, it can also lead to serious adverse effects, such as the joint and tendon damage observed in this case.
• The lack of nerve sensation after the neurectomy may lead to the horse being unaware of the extent of wear and strain on its lower leg, thus making it more susceptible to injury.

Resulting Conditions and Autopsy Findings

• Following the bilateral luxation of the mare’s coffin joints, it was euthanized, presumably due to the severity of its condition and the likely poor quality of life as a result.
• The autopsy revealed a complete rupture of the deep flexor tendons, structures that are critical for normal leg function as they enable a horse to flex its foot. The supporting ligaments of the coffin joints were likewise entirely torn.
• Furthermore, arthritis was present in the coffin joints, accompanied by erosion of the articular cartilage – the smooth, protective tissue that cushions joints and facilitates movement.

Conclusion and Implications

• This case study emphasizes the potential risks and complications linked to palmar neurectomy. While these surgical procedures can bring immediate relief by reducing lameness, severe long-term damage to the leg structures of the horse may occur.
• It raises awareness about the need for careful consideration and continuous monitoring after surgery in order to detect and address complications early on, possibly even preventing severe outcomes such as seen in this case.