Musculoskeletal anatomy – Part 1

the sacrospinous ligament attaches to the ischial spine which is not a bony landmark of the pelvic outlet

The pelvis is tilted anteriorly in the anatomical position and the ASIS and pubic symphysis are the two most anterior points.

Linea aspera is found on the posterior surface of the femur

The other muscles all attach to certain points of the greater trochanter

Iliacus and psoas major are two strong flexors of the hip joint. They combine to form the iliopsoas.

They are both supplied by the nerve to obturator internus

Femoral injury will only cause impaired hip flexion instead of complete loss of the function because the iliopsoas muscle is still functioning.

Obturator nerve innervates muscles of the medial (adductor) compartment of the thigh. Don't be trick into thinking the obturator internus is supplied by it because they are similarly named.

Arising from the lumbar plexus, the iliohypogastric nerve and ilioinguinal nerve both originate from the anterior ramus of L1 spinal nerve.

Up to 20% of posterior hip dislocation will lead to sciatic nerve injury

S1 supplies the posterior thigh and the little toe. L3 supplies anterior middle part of thigh. L4 supplies anterior lower thigh and medial calf. L5 supplies lateral calf.