OrthoNet

Acetabulum - posterior approach

* position - lat. decubitus

* incision - long. incision centered on GT extending from just below iliac crest ot 10cm below tip of GT

* no internervous plane

* dissection
- incise subcut. fat
- incise fascia lata in line with skin in lower 1/2 of wound & extend sup. along ant. border of GMax
- ID sciatic n.
- retract split edges of fascia to reveal piriformis & short ER
- IR leg to put short ER on stretch
- detach short ER from insertion on femur
- elevate GMed from outer side of ilium
- troch. osteotomy if more visualization needed
- incise capsule

* dangers
- sciatic n. - ID b4 cutting short ER & protect with short ER

- IGA - exits pelvis under piriformis & turns up to supply GMax