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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THE sesamoid bone sits at the back of the fetlock joint and anchors the suspensory ligament, thus allowing a horse's foot and fetlock to move properly.
Since the fabella is located at the intersection point of these tensile forces, fracture of this sesamoid bone may occur.
Detecting these sesamoid bones often becomes difficult as they are small, oval, rough, convex in shape and composed mainly of bone, cartilage, and fibrous tissue, their contours on radiographs often are obscured by the opacity of the larger bones.
Patella (pah-tehl-ah) This is the equivalent to the kneecap in humans, and is a large sesamoid bone that is located between the femur and the tibia in the hindquarter.
Just above the fetlock, this ligament divides into two diverging, rounded branches that are attached to the upper and outer part of the corresponding sesamoid bone.
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.
Scapinelli[11] described in this ligament the formation of sesamoid bones, developing in connective tissue with a previous stage of fibrocartilaginous metaplasia.
Mazel Trick, who broke down in training for last Sunday's Pacific Classic, is scheduled to be flown to Kentucky today to continue his recovery from surgery that employed 18 screws, a compression plate and wire to repair the sesamoid bones in his right foreleg.
Aidan O'Brien's wife Annemarie tweeted: "Kissed sustained a fracture of the sesamoid bones of her left fore at Chantilly today.