Lower limb
Transverse acetabular ligament
Ligamentum transversum acetabuli
- Origin
- Anterior margin of acetabular notch
- Insertion
- Posterior margin of acetabular notch, bridging the gap to complete the acetabular ring
- Function
- Completes the socket circumference and forms a tunnel transmitting obturator vessels to the acetabular fossa
- Innervation
- Obturator nerve (L2–L4)
- Movement & chain
- Resists outward expansion of acetabulum under axial loading
- Palpation
- Intra-articular, non-palpable
- Clinical
- Key anatomical landmark used by orthopedic surgeons to determine native anteversion and inclination when positioning the acetabular cup in total hip arthroplasty (THA).
- Segmental innervation
- L2–L4
- In clinical practice
- Surgical landmark for acetabular cup orientation to prevent post-operative hip dislocation
- Region in the model
- Lower limb