Ilioinguinal Approach to the Acetabulum

What it exposes. The ilioinguinal approach delivers comprehensive access to the entire anterior acetabulum — the iliac wing, the pelvic brim, the quadrilateral surface and the superior pubic ramus — through three anatomical windows. It is the gold standard for anterior column and anterior wall fractures and, combined with the Kocher-Langenbeck, for both-column patterns. Historical context. Described by Emile Letournel in the 1960s, it was the first systematic approach to the anterior acetabulum and remains the foundation of modern pelvic and acetabular surgery. It is a true internervous dissection and the template for the modern anterior intrapelvic approaches that followed (modified Stoppa, Pararectus).

Indications. - Absolute: displaced anterior column fractures, displaced anterior wall fractures, both-column fractures (combined with Kocher-Langenbeck), anterior column plus posterior hemitransverse (ACPHT) patterns.

• Relative: T-type fractures (anterior component), selected transverse fractures with anterior extension.
• Operative displacement criteria: greater than 2-3 mm step-off in the weight-bearing dome, roof arc less than 45 degrees on any view, posterior wall involvement greater than 40%, marginal impaction greater than 5 mm, incongruent reduction on CT. Contraindications and timing. - Absolute: medical unfitness for prolonged surgery, active pelvic infection, an irreconstructable acetabulum (salvage arthroplasty indicated).
• Relative: presentation delayed beyond about 3 weeks (callus and heterotopic bone make reduction exponentially harder), severe osteoporosis, extensive comminution (may need added approaches), previous surgery with scarring.
• Ideal timing: 3-5 days once swelling has subsided; acceptable up to 3 weeks; beyond 3 weeks difficulty rises sharply. Position and landmarks. - Supine on a radiolucent table (essential for inlet, outlet and Judet fluoroscopy).
• Arms folded across the chest (or on a board if far lateral); a bump under the ipsilateral hip is generally avoided because it closes the anterior approach, though a small bump can help lateral-window access.
• Foley catheter mandatory; wide prep from nipple line to knees; the leg is free to allow hip flexion, which relaxes psoas.
• C-arm swings from the opposite side of the table, which must be clear; the surgeon stands ipsilateral (unlike Stoppa), the assistant contralateral or cephalad/caudad. Alternative and complementary approaches. The ilioinguinal is no longer the only anterior option — modern practice is to choose the window that matches the fracture.

The ilioinguinal approach works through three sequential windows created by mobilising the iliopsoas (laterally) and the external iliac vessels (medially). It is a true internervous dissection — the femoral nerve lies laterally on iliopsoas, the obturator nerve medially deep to the vessels, and the external iliac vessels are the central landmark that separates the two nerve territories.

View larger

Neurovascular structures at risk, by layer.

Complications.

Managing intraoperative vessel injury.

Extensile options. The lateral window extends proximally along the iliac crest to reach the whole iliac wing and SI joint; the medial limb can be supplemented by a modified Stoppa window for superior quadrilateral-surface access. For both-column fractures the ilioinguinal is combined with a Kocher-Langenbeck (typically staged: posterior first prone, then anterior supine; or simultaneous two-team in the lateral position). The anterior intrapelvic (Keel) approach fuses the ilioinguinal and Stoppa concepts through a single incision for surgeons fluent in both. Rehabilitation.

Long-term outcomes. Good-to-excellent results in 70-85% with anatomic reduction; post-traumatic arthritis risk 20-30% at 10 years; heterotopic ossification is common but usually asymptomatic; functional recovery continues for up to 2 years. Quality of articular reduction is the dominant modifiable determinant of long-term hip survival.

• Acetabular ORIF — anterior column — the principal indication, high and low patterns.
• Acetabular ORIF — both-column — combined with Kocher-Langenbeck for the posterior component.
• Transverse acetabular ORIF — selected transverse and T-type patterns with an anterior extension.
• Anterior wall ORIF and anterior column plus posterior hemitransverse (ACPHT) fixation.
• Plating of the superior pubic ramus and quadrilateral surface (often now via an added modified Stoppa window).

Guidelines, registries and global practice. Centralisation of complex acetabular surgery. Across the UK (BOAST — Management of Acetabular Fractures), North America (OTA) and Australasia, displaced acetabular fractures are increasingly referred early to specialist pelvic/acetabular units at major trauma centres. Outcome data consistently show that surgeon and unit volume are stronger predictors of anatomical reduction and function than the specific anterior approach chosen. Timing. International consensus favours definitive fixation within roughly 5 to 10 days of injury once the patient is physiologically stable and soft-tissue swelling has settled. Reduction quality and surgical difficulty deteriorate markedly beyond about 2 to 3 weeks because of early callus and fibrosis; very delayed presentations may be better served by acute total hip replacement, especially in older patients with dome impaction or femoral head injury. Thromboprophylaxis. Combined mechanical and pharmacological prophylaxis is standard worldwide. Low-molecular-weight heparin or a direct oral anticoagulant is typical, with extended prophylaxis (commonly 4 to 6 weeks) given the prolonged immobilisation and high VTE risk of pelvi-acetabular trauma. Specific agent choice follows local guidance (for example NICE in the UK, ACCP/ASH in North America). Heterotopic ossification prophylaxis. The ilioinguinal approach carries a lower HO risk than posterior or extensile approaches. Where prophylaxis is used, options are indomethacin (or another NSAID) for several weeks or single-dose radiotherapy (commonly around 7 to 8 Gy); evidence for routine prophylaxis with anterior-only approaches is weak and many units omit it. Blood management. Major acetabular surgery can involve significant blood loss. Group-and-save/crossmatch, intraoperative cell salvage and an institutional massive transfusion protocol should be available; tranexamic acid is widely used to reduce perioperative blood loss. Registry and outcome context. There is no implant-survivorship registry for acetabular ORIF equivalent to the arthroplasty registries (NJR, AOANJRR, SHAR). Evidence is therefore driven by large surgeon series (Letournel/Judet, Matta) and national trauma databases, which consistently confirm that quality of articular reduction is the dominant modifiable determinant of long-term hip survival.