Acetabulum - Anterior Approach

Modern Study Review (AI-Generated)

High-Yield Summary

The Anterior Approach to the Acetabulum (Extended Iliofemoral Approach) is the gold standard for surgical management of complex anterior column and wall acetabular fractures. It offers direct visualization and access to the anterior column, iliac wing, and quadrilateral plate, facilitating precise fracture reduction and fixation. Despite advances in minimally invasive and arthroscopic techniques, this approach remains indispensable for extensive anterior acetabular exposure.

Applied Anatomy & Intervals

Internervous Interval

Between Sartorius (Femoral nerve) and Tensor Fascia Lata (Superior Gluteal nerve)
Between Rectus Femoris (Femoral nerve) and Gluteus Medius (Superior Gluteal nerve)

Anatomic Landmarks

Anterior Superior Iliac Spine (ASIS)
Iliac Crest
Lateral aspect of the patella (distal extent of incision)
Greater Trochanter (GT) (for posterior column exposure via osteotomy)

Patient Positioning & Setup

Table Type:

Radiolucent flat or fracture table

Patient Position:

Supine, with optional sandbag under affected hip to optimize exposure

Specialized Equipment:

Limb positioner or assistant for controlled external rotation of the leg

C-arm fluoroscopy positioned for intraoperative pelvic and hip imaging

Surgical Technique (The “Vital Steps”)

Incision & Superficial Dissection

Long curved incision starting from the iliac crest, crossing over the ASIS, then vertically extending down the lateral thigh toward the lateral patella (8–15 cm)

Identify and protect the lateral femoral cutaneous nerve (LFCN), which pierces the fascia near the interval between Sartorius and TFL

Deep Dissection & Exposure

Externally rotate the leg to relax Sartorius

Develop the interval between Sartorius (medial) and TFL (lateral), incising deep fascia on the medial side of TFL

Detach TFL origin to facilitate plane development

Identify and protect the ascending branch of the lateral femoral circumflex artery crossing between Sartorius and TFL

Detach Gluteus Medius and Minimus origins from the iliac wing; perform greater trochanter osteotomy if posterior column exposure is needed

Detach Rectus Femoris origins (AIIS and superior acetabular rim) for acetabular access

Subperiosteal dissection under Iliacus to expose medial iliac wing and pelvic brim

The “Danger Zone”

Structure	Risk Description	Protection Strategy
Lateral Femoral Cutaneous Nerve	Passes over/behind Sartorius ~2.5 cm distal to ASIS; vulnerable during fascia incision	Identify and protect during superficial dissection; avoid aggressive retraction
Femoral Nerve	Lies anterior to hip joint, medial to Rectus Femoris in femoral triangle	Avoid deep medial dissection; maintain awareness of nerve location
Ascending Branch of Lateral Femoral Circumflex Artery	Crosses between Sartorius and TFL proximally; risk of bleeding	Identify and ligate or cauterize carefully during dissection
Superior Gluteal Artery and Nerve	Supplies Gluteus Medius and Minimus; at risk with muscle detachment	Minimize detachment extent; protect neurovascular bundle during osteotomy

Post-Operative Pearl

Early mobilization is encouraged; however, avoid active hip flexion against resistance for 4–6 weeks to protect repaired rectus femoris and abductors. Weight-bearing depends on fracture fixation stability.

Classic Clinical Notes