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The pectineal line of femur or linea pectinea femoris in Latin is an intermediate ridge found on the posterior surface of the femoral bone. It curves medially around the shaft, and anteriorly under the lesser trochanter. It then fuses with the medial aspect of the linea aspera.
The pectineal line is somewhat rough, from the base of the lesser trochanter to the linea aspera. The latter is a prominent raised crest that acts as the major site for muscle attachments in the thigh. The pectineus muscle is a flat quadrangular shaped muscle present inside the femoral triangle. It belongs to the anterior compartment of the thigh, and arises from the pecten pubis, between the iliopectineal eminence and the pubic tubercle. Its muscle fibers descend posteromedially and then posterolaterally to insert into the pectineal line of the femur. Its primary function is to adduct the thigh and flex the hip, and it cannot be clinically evaluated in isolation.
Lateral to the pectineal line, the adductor brevis muscle of the thigh is attached, medial to the adductor magnus muscle, and proximal to the linea aspera. Pectineus and adductor brevis are attached to the posterior femoral surface between the gluteal tuberosity and the spiral line. The pectineal line also extends to merge with the intertrochanteric line, where the vastus medialis muscle attaches at its distal end.
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