What is the fibular sessamoid?
Fibular sesamoid is one of the two small bones, located along the underside of the first metatarsofallangal joint in the leg, the joint on the base of the large finger. Along with the tibial sesamoid, it is planted between the tendon fibers passing through the joint, the tendon flexor hallucis brevis (FHB). At the same time, these bones hold the tendon of the FHB and the tendon of the muscle Flexor Halucis Longus (FHL), which acts as a pulley on the joint to bend or curl a large finger down, then from the joint. Tibial and fibular sesamoid serves double the function of improving the efficiency of the tendons when the joint moves by increasing the torque of the arm and the shading of the tendons before the damage caused by the legs causes from the ground during walking movements.
The creation of the first metatarsophlangal joint is the first metatarsal bone, a long bone of the foot that leads between the base finger and the arch and the first proximal phalanx, the nearby bone of the large tip. This is a condyloid or ellipSide joint, which means that convex distal or distant end of the metatarsal bone is suitable against concave proximal or close end of Falang. Although the tip can move from side to side in the joint, its main movements are flexion movements and extension: ripple down and lifting up. Flexor movement is initiated by flexor hallucis brevis and longus tendon, which runs from their corresponding muscles in the leg and calf to the sesamoid and phalanx bones with large fingers.
where Flexor Hallucis Brevis, dividing into two parts that attach two tendons, attach to the base of the proximal phalanx, where the fibular sesamoid and tibial sesamoid are found. As on the plantar or underside of the foot, the sesamoids are smooth, round bones, with a fibular sesamoid located closer to the second tip. Each part of the FHB tendon run and around one of these small bones attached to the base of the proximal phalanx. There is a groove in the space between two sesamoids, through which it passes through the tendon flexor hALUCIS LONGUS before joining distal or far phalanx bones. In addition, part of the tendon of the muscle Aductor Hallucis, which pulls a large finger inside towards the second tip, inserts on the fibular sesamoid.
sesamoid bones affect the foot mechanics as they push the ground. They prevent FHB and FHL tendons to be clamped with metatarsofalangal joint when the tip bends down while pushing. They provide protection of the FHL tendon, which sits in the furrow between the sesamoid bones rather than being crushed by metatarsal and phalanxal bosses against the ground.
These bones also act as a fulcrum for metatarsophalangeal joint, which increases the current flexion of the tip. The moment of the arm is simply the distance between the center of the center and the muscles or the tendon passing through the joint, also known as the "line of force". In other words, the presence of tibial and fibular sesamoids placed the tendon of the FHB further from the bones that intersects. This increased torque arm improves mechanical efficiency Flexor Hallucis Brevis when turning largeAbout the finger around the joint, when muscle contractions, as well as opening the door, is more effective when you push the side of the door to the furthest of the curtain, rather than on the side closest to the hinge.