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Hip joint act as both first class lever and third class lever, as per which work we are doing and which muscles are working on hip for that particular work.
When we stand in single leg, then force exerted by hip abductor muscles is "power " and neck of femur is "power arm"; centre of femoral head is "fulcrum"; and body weight is "load" and centre of head of femur to symphysis pubis is "load arm". So here hip joint work as first class lever.
But when we do straight leg raising (SLR), then "power" is exerted mostly by the hip flexor muscles [comprise the psoas major (PM), iliacus (IL), rectus femoris (RF), sartorius (SAR), adductor longus (AL), and tensor fasciae latae (TFL)] in between hip joint and knee joint (here length "power arm" is different for different muscles, but we can assume that "power arm" is hip joint to knee joint. Here "load" is weight of leg and "load arm" is hip joint to foot. So in this case, hip joint work as third class lever.
Kartick Nasipuri
Wiki User
∙ 11y agoNo. The hip joint is an example of a third class lever.
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No it is an example of a third class lever
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