Evaluation of age-related changes in the structure of the equine tarsometatarsal osteochondral unit.
OBJECTIVE
To investigate effects of age on thickness and morphologic characteristics of hyaline cartilage, calcified cartilage, total cartilage, and subchondral bone (SCB) in the equine tarsometatarsal joint.


METHODS
23 tarsal joints from cadavers of 23 ponies (11 days to 25 years old); ponies were limited to pasture exercise and euthanatized for reasons not related to this study. Procedures-Tarsi were allocated into several age groups (11 days old [n = 3], 6 to 9 months old [4], 2 to 3 years old [3], 6 to 8 years old [4], 11 to 17 years old [6], and 20 to 25 years old [3]). Histologic examination and histomorphometric measurement of hyaline cartilage, calcified cartilage, total cartilage, and SCB were performed at medial and lateral sites.


RESULTS
A significant decrease was detected in thickness of hyaline cartilage and total cartilage with increasing age, but there was a significant increase in thickness of calcified cartilage and SCB with increasing age. Differences in chondrocyte and collagen fiber arrangement, tidemark, and osteochondral junction morphology were evident among age groups.


CONCLUSIONS
These findings suggested that the various tissues of the osteochondral unit change in different ways with age. The response of each tissue may be related to relative response of the tissues to strains induced by pasture exercise but could have an influence on how the overall properties of the osteochondral unit change with age. The findings may also be suggestive of changes that develop prior to the onset of osteoarthritis.
Murray
Rachel C
RC
Centre for Equine Studies, The Animal Health Trust, Lanwades Park, Kentford, Newmarket, Suffolk CB8 7UU, England.
Blunden
Tony S
TS
Branch
Marion V
MV
Tranquille
Carolyne A
CA
Dyson
Sue J
SJ
Parkin
Tim D H
TD
Goodship
Allen E
AE
D000367:Age Factors; D000818:Animals; D002358:Cartilage, Articular / Q000033:anatomy & histology / Q000502:physiology* / Q000648:ultrastructure; D006651:Histocytochemistry / Q000662:veterinary; D006736:Horses / Q000033:anatomy & histology / Q000502:physiology*; D018709:Statistics, Nonparametric; D013640:Tarsal Joints / Q000033:anatomy & histology / Q000502:physiology*