Which muscle inserts on the lesser trochanter?

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The lesser trochanter is the attachment site for the iliopsoas group, with the psoas major providing the direct insertion. Psoas major runs from the lumbar spine and, via its tendon with the iliacus, attaches to the lesser trochanter of the femur. This makes it the primary muscle that inserts there and a key hip flexor. The iliacus contributes to the same tendon but, by itself, does not attach directly to the lesser trochanter; sartorius and pectineus attach elsewhere on the femur or tibia. So the muscle that inserts on the lesser trochanter is the psoas major.