Article: Microstructural features of subchondral radiolucent lesions in the medial femoral condyle of juvenile Thoroughbreds: A microcomputed tomography and histological analysis
Equine veterinary journal. 2022 May, v. 54, no. 3
2022
Abstract: BACKGROUND: The aetiology of equine medial femoral condyle (MFC) subchondral bone radiolucencies (SR) is unknown. OBJECTIVES: Characterise the microstructural structural features of MFC SR in juvenile Thoroughbreds with microcomputed tomography (μCT) and ...
Abstract | BACKGROUND: The aetiology of equine medial femoral condyle (MFC) subchondral bone radiolucencies (SR) is unknown. OBJECTIVES: Characterise the microstructural structural features of MFC SR in juvenile Thoroughbreds with microcomputed tomography (μCT) and histology. STUDY DESIGN: Cross‐sectional post‐mortem study. METHODS: Distal femurs were collected at post‐mortem. Conventional tomodensitometry was employed to scout for MFCs with and without SR lesions (SR+ and SR−, respectively). Group 1 were CT MFC SR+ and Group 2 age‐matched SR− controls. Both underwent μCT and histological analysis. Group 3 CT MFC SR− foals, <6 months, were selected to search for chondronecrosis. Histological sections, processed from the lesion (Group 1) and a corresponding site in Groups 2 and 3, were assessed for chondronecrosis, fibrin, fibroplasia and osteochondral separation. Group 3 sections were surveyed for chondronecrosis alone. RESULTS: A total of 178 femurs from 89 Thoroughbreds were harvested. Of these horses 19.1% (95% CI: 10.9%‐27.3%) were CT MFC SR+ (17/23; 7.46 ± 4.36 months) and met the inclusion criteria for Group 1. Group 2 included 30 CT MFC SR− specimens (5.00 ± 2.73 months) and Group 3 had 44 CT MFC SR− s (2.68 ± 1.74 months). SR were located axially in foals <7 months of age, and centrally thereafter. All SRs had areas of thickened cartilage on histology and separation at the osteochondral junction containing fibrin (acute event) and fibroplasia (chronicity) in 73.9% (17/23; 95% CI: 56%‐91.9%). In Group 1 specimens, chondronecrosis was present in 82.6% (19/23; 95% CI: 67.1%‐98.1%) but four MFC SR+ had no evidence of chondronecrosis. Chondronecrosis was not detected in the Group 3 foal MFCs. MAIN LIMITATIONS: No longitudinal follow‐up. CONCLUSIONS: The absence of chondronecrosis, pathognomic of osteochondrosis, in four MFC SR+s and in all of the CT MFC SR− foals suggests that osteochondrosis is not the cause, or the only cause, of these lesions and favours trauma as an alternate aetiological hypothesis. |
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Keywords | cartilage ; etiology ; fibrin ; foals ; histology ; juveniles ; micro-computed tomography ; osteochondrosis |
Language | English |
Dates of publication | 2022-05 |
Size | p. 601-613. |
Publishing place | John Wiley & Sons, Ltd |
Document type | Article |
Note | JOURNAL ARTICLE |
ZDB-ID | 41606-x |
ISSN | 0425-1644 |
ISSN | 0425-1644 |
DOI | 10.1111/evj.13486 |
Database | NAL-Catalogue (AGRICOLA) |
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