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Retained cartilage in the distal radial physis of foals
Insights
Foals with growth plate defects in their distal radius exhibited retained cartilage and microfractures. These lesions, more prominent laterally, suggest potential issues in young horse bone development.
Area of Science:
- Veterinary Medicine
- Equine Orthopedics
- Developmental Biology
Background:
- Growth plate abnormalities can impact long bone development in young animals.
- The distal radial physis is crucial for radial growth in foals.
- Understanding these defects is key to addressing developmental orthopedic diseases.
Purpose of the Study:
- To investigate the nature and location of growth plate defects in the distal radial physis of foals.
- To characterize the histological findings associated with these defects.
Main Methods:
- Histological examination of the distal radial physis from 13 foals aged 3 to 70 days.
- Detailed analysis of lesions within the lateral and medial aspects of the physis.
Main Results:
- Lesions were identified in both lateral and medial aspects of the distal radial physis.
- Lateral defects were more frequent and pronounced than medial ones.
- Observed lesions included retained cartilage, discontinuity of cartilage and primary spongiosa, and microfractures of the primary spongiosa.
Conclusions:
- Distal radial physis defects in foals involve retained cartilage and microfractures.
- Primary spongiosa microfracture may contribute to cartilage retention, though the sequence of events requires further investigation.
- These findings highlight potential developmental orthopedic issues in young horses.
Abstract:
Examination of growth plate defects in the distal radial physis of 13 foals three to 70 days of age revealed lesions in the lateral and medial aspects of the distal radial physis; the lateral defects were more numerous and obvious. Lesions consisted of widening of the zone of hypertrophying cells of the metaphyseal growth plate (retained cartilage), retained cartilage with discontinuity of cartilage and primary spongiosa, and microfracture of the primary spongiosa. In some foals, the cartilage retention was thought to be due to primary spongiosa microfracture, although fracture subsequent to cartilage abnormality was not excluded.