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The lateral rotator group is a group of six small muscles of the hip which all externally (laterally) rotate the femur in the hip joint. It consists of the following muscles: piriformis, gemellus superior, obturator internus, gemellus inferior, quadratus femoris and the obturator externus. [1]
External rotation (or extorsion or lateral rotation) is an anatomical term of motion referring to rotation away from the center of the body. The external rotator muscles include: Muscles
The adductor group is responsible for hip adduction. Medial rotation is performed by the gluteus medius and gluteus minimus, as well as the tensor fasciae latae and assisted by the adductors brevis and longus and the superior portion of the adductor magnus. Each muscle of the lateral rotator group causes lateral rotation of the thigh.
The Drehmann sign describes a clinical test of examining orthopedic patients and is widely used in the functional check of the hip joint. It was first described by Gustav Drehmann (Breslau, 1869–1932). [1] The Drehmann sign is positive if an unavoidable passive external rotation of the hip occurs when performing a hip flexion.
Internal rotation – with knee and hip both flexed at 90 degrees the ankle is abducted. External rotation – with knee and hip both flexed at 90 degrees the ankle is adducted. (also done with the Patrick's test / FABER test) Flexion (also known as the Gaenslen's test) Extension – done with the patient on their side.
The functions of muscles includes extension, abduction and internal as well as external rotation of the hip joint. The gluteus maximus also supports the extended knee through the iliotibial tract. The human gluteus maximus plays multiple important functional roles, particularly in running rather than walking.
In vertebrate anatomy, the hip, or coxa [1] (pl.: coxae) in medical terminology, refers to either an anatomical region or a joint on the outer (lateral) side of the pelvis.. The hip region is located lateral and anterior to the gluteal region, inferior to the iliac crest, and lateral to the obturator foramen, with muscle tendons and soft tissues overlying the greater trochanter of the femur. [2]
The posterior fibres of gluteus medius contract to produce hip extension, lateral rotation and abduction. During gait, the posterior fibres help to decelerate internal rotation of the femur at the end of swing phase. Together with the gluteus minimus and other short pelvi-trochanteric muscles it centers and stabilises the hip.