Miscellaneous Hip Flashcards
Hip (flexion/extension) in the sagittal plane during bilateral stance is the moment that is created and the main tissue that restricts that motion is the iliofemoral ligament which prevents you from falling into hip (flexion/extension).
extension; extension
In this frontal plane on both legs, the moment overall would be a potential for a hip (adduction/abduction) torque. The pelvis would fall towards the line of gravity creating an overall (adduction/abduction) torque. However, because we have equally spaced feet and each one counteracts each other it ends up being very balanced. So the ground reaction force between both legs, is what offsets that (adduction/abduction) torque. There’s no muscle energy needed if you’re standing still in a centered position in quiet standing.
adduction; adduction; adduction
If we were to have a flexion contracture of the hip meaning, you were never able to get to fully neutral here, the femur stays flexed relative to the pelvis. So the line of gravity moves (anterior/posterior) to the axis of rotation, the proximal segment falls towards the line of gravity and now there is a hip flexion moment that is created in this aspect. If there is a hip flexion moment, the hip (flexors/extensors) have to turn on and have to work with a counterclockwise torque keep the individual upright. This is going to create an increased metabolic cost of standing because increased muscle activity is needed.
anterior; extensors
In a unilateral stance the line of gravity is still (anterior/posterior) to the hip like it normally would be, and it is now just medial to the foot. An adduction (a clockwise torque that is being performed on the axis of rotation on the hip) moment of the hip is created in this position by gravity. The hip abductors will resist the adduction moment and this is by far the most functional way that our hip abductors work. We hardly ever in real life stand up and take our leg and swing it out to the air, it hardly ever works open chain. It’s always in this closed chain position where that is working in order to stabilize and level out your pelvis.
posterior
