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Timing and Rate of skeletal maturation in Horses – by Deb Bennett, Ph.D.
- Short pastern – top and bottom between birth and 6 months.
- Long pastern – top and bottom between 6 months and one year.
- Cannon bone – top and bottom between 8 months and 1.5 years
- Small bones of the knee – top and bottom of each, between 1.5 and 2.5 years
- Bottom of radius-ulna – between 2 and 2.5 years
- Weight-bearing portion of glenoid notch at top of radius – between 2.5 and 3 years
- Humerus – top and bottom, between 3 and 3.5 years
- Scapula – glenoid or bottom (weight-bearing) portion – between 3.5 and 4 years
- Hindlimb – lower portions same as forelimb
- Hock – this joint is “late” for as low down as it is; growth plates on the tibial and fibular tarsals don’t fuse until the animal is four (so the hocks are a known “weak point” – even the 18th-century literature warns against driving young horses in plow or other deep or sticky footing, or jumping them up into a heavy load, for danger of spraining their hocks).
- Tibia – top and bottom, between 3 and 3.5 years
- Femur – bottom, between 3 and 3.5 years; neck, between 2.5 and 3 years; major and 3rd trochanters, between 2.5 and 3 years Pelvis – growth plates on the points of hip, peak of croup (tubera sacrale), and points of buttock (tuber ischii), between 3 and 4 years.