Sesamoid Bones


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Related to Sesamoid Bones: accessory bones

Sesamoid Bones

 

short bones occurring in the joint capsules of the fingers and toes in animals and man. Their number is inconstant, varying from one to eight.

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Most people have 5 sesamoid bones in each hand: 2 at the thumb metacarpophalangeal (MCP) joint, 1 at the interphalangeal joint of the thumb, 1 at the MCP joint of the index finger, and 1 at the MCP joint of the small finger.
It reinforces the plantar capsule and also attaches the hallux sesamoid bones to the base of the proximal phalanx (Figure 15).
Racecourse vet Peter Webbon said: 'Having been taken off the course by ambulance for further assessment, the nature of the injury to the cannon and sesamoid bones was such that they were impossible to repair.
Mazel Trick fractured both sesamoid bones in his right foreleg and was pulled to a stop by jockey Chris McCarron during what would have been a 5-furlong workout Tuesday morning at Del Mar.
There was a sad aftermath to the race as the runner-up X Rated broke both sesamoid bones in his near fore shortly before the finishing line and was put down.
The fractures in both sesamoid bones above the horse's right front ankle will end the 4-year-old's promising career.