Neil Keleher
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Quadratus Femoris

A hip stabilizer that could also help stabilize the knee and ankle
Published: 2019 12 10
Categories/Tags: The hip joint

Quadratus femoris could potentialy work in concert with the tensor fascia latae and thus not only help stabilize the hip joint, but also have an affect on the knee and ankle.

gemellus superior, gemellus inferior, obturator internus, quadratus femoris, bceps femoris long head, biceps femoris short head, semitendinosus, semimembranosus. Neil Keleher, Sensational Yoga Poses.

One of the "deep" hip muscles (or "deep six"), the quadratus femoris attaches to the hip bone just in front of the ischial tuberosity. In other words, it attaches near the sitting bone. And to be clear, it attaches to the outer surface of the hip bone. From there the fibers of this roughly rectangular shaped muscle attach to the back of the femur, along the inter trochanter crest, a slight ridge that angles downwards and inwards from the greater trochanter on the outer edge of the femur to the lesser trochanter at the inner edge.

It's attachment points are relatively close to those of the gemelli muscles as well as the fibers of the obturator internus, where that muscle folds around the back edge of the pelvis prior to attaching to the femur.

In anatomy of movement, the author points out how the gemelli and obturator internus (as well as the obturator externus) have fibers that run slightly upwards from the hip bone to the thigh bone so that these muscles, assuming the body is upright, can actually resist the pull of gravity on the pelvis and create some lift between hip bone and femur at the hip joint.

We can assume then that the quadratus femoris fibers have fibers that run slightly downwards from the hip bone thus creating the opposite effect.

Like the gemelli and obturator internus, but unlike the gluteus maximus, the quadratus femoris only crosses and acts on one joint, the hip joint. It has a similiar fiber direction to the deep portion of the gluteus maximus. However, the fibers of that muscle may also attach to the sacrum making it a polyarticulate muscle.

The quadratus femoris could be thought of as connecting to the bottom corner of the hip bone. Opposite it and attaching at the ASIC, the point of the hip crest and at the opposing corner of the hip bone is the gluteus minimus as well as the tensor fascia latae and the sartorius. Of these, only the gluteus minimus is mono-articulate. Tensor fascia latae and sartorius all attach to the top of the tibia.

Standing upright on both feet and allowing the right hip bone to move rearwards and tilt forwards, the quadratus femoris could be used to tilt the hip bone backwards and externally rotate the hip, pushing the hip bone forwards as a result.

Keeping the pelvis and thigh bone still and activating quadratus femoris, it could act against the gluteus minimus to help stabilize the hip joint. Or it could work against the tensor fascia latae and thus help to stabilize or control the hip joint, knee and even foot and ankle since the tensor fascia latae attaches to the tibia via the IT band.

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