Cartilage Degeneration of the Metacarpal Condyle and Enthesopaties of The Collateral Ligaments of Equine Metacarpophalangeal Joint.

This research investigates the connection between the degenerative processes of the joint cartilage and the diseases of ligaments (enthesopathies) in the Meta-Carpophalangeal (MP) joint of horses. The paper used numerous assessment methods, including radiographic and ultrasound scans, as well as post-mortem examination. A strong correlation was noted between ultrasound results and physical examination findings, demonstrating a relationship between joint cartilage degeneration and Ligamentous Enthesopathies (L.E).

Research Methods

• The researchers selected and evaluated 30 equine forelimbs from animals that had died from various conditions with an average age of 5.7 years.
• The specimens, provided by a private clinic or a Laboratory of Veterinary Pathology, were initially examined using different radiographic projections (lateromedial, flexed lateromedial, dorsopalmar, dorsolateral-palmaromedial oblique 45, and dorsomedial-palmarolateral oblique 45).
• Following the radiographic assessment, the researchers conducted transverse and longitudinal ultrasound scanning to obtain images of the dorsal and lateral aspect of the MP joint. They used a Sonosite Edge machine with a 5-10 MHz linear transducer.
• After the imaging studies, the specimens were subject to gross and histopathological examination, the equivalent of a post-mortem study in humans, which provides valuable details on the tissues and cells.

Research Findings

• The study established a strong positive correlation (P value <0.001) between the ultrasound imaging and the macroscopic (tissue-level) observation. This means that the results of the ultrasound scan matched closely with the physical examination of the diseased structures, confirming the reliability of the ultrasound as a diagnostic tool.
• The correlation showed a significant relationship between the degeneration of the cartilage in the MP joint and the occurrence of L.E (in this context, disease of the ligaments – more specifically where the ligament attaches to the bone), both on the medial and lateral (inner and outer) sides.
• This suggests that the cartilage degeneration (wear and tear of the protective joint lining) can predispose the MP joint to the development of further issues such as enthesopathies and osteophytes (abnormal growths of bone), impacting not only the joint itself but also the associated ligaments.