Surgical Approaches to the Hip and Pelvis

Hip and pelvic approaches are high-stakes because the region combines deep joints, major vessels, large nerves, powerful muscles and complex three-dimensional bony anatomy. The approach is not just a route to bone; it affects reduction quality, implant position, dislocation risk, abductor function, nerve injury, bleeding, infection risk and future revision options.

The common clinical settings are:

• primary and revision total hip arthroplasty
• femoral neck fracture arthroplasty
• acetabular fracture fixation
• pelvic ring fixation
• hip preservation surgery
• infection, tumour or complex reconstruction
• paediatric hip exposure for selected conditions

The same named approach may mean different things in different settings. A Kocher-Langenbeck exposure for the posterior acetabulum is related to posterior hip exposure but is not the same operation as a routine posterior arthroplasty approach. A Smith-Petersen exposure can be used for direct anterior THA, femoral head work and some hip preservation operations, but the deep releases and objectives differ.

The hip and pelvis are approached through a limited number of safe windows. The surgeon must know which structures are being protected and which structures are being deliberately released or repaired.

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Hip arthroplasty approach anatomy

Acetabular and pelvic anatomy

The acetabulum is a ring-like structure with anterior column, posterior column, anterior wall, posterior wall and quadrilateral surface components. An approach must reach the surface that needs reduction and fixation.

Key danger structures:

• External iliac vessels: anterior approaches and pelvic brim work.
• Femoral nerve: lateral to femoral vessels and vulnerable in anterior windows.
• Corona mortis: vascular connection over the superior pubic ramus; it may bleed severely if missed.
• Obturator nerve and vessels: medial acetabular and quadrilateral surface work.
• Sciatic nerve: posterior acetabular exposure, posterior hip dislocation and posterior column manipulation.
• Superior gluteal bundle: exits above piriformis and can be injured with proximal posterior exposure or excessive abductor split.

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An internervous plane is safe because the muscles on either side are supplied by different nerves. Some hip and pelvic approaches are true internervous planes; others are muscle-splitting or tendon-release approaches that are safe only if the split, release and repair are controlled.

Classifications help define the target; they do not choose the approach alone.

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Limitations

Classifications describe patterns, not the whole patient. Approach choice can change because of obesity, previous scars, open wounds, vascular injury, infection, surgeon experience, implant inventory, associated fractures and whether a second team is needed.

Clinical assessment for an approach is not a generic history; it is a surgical access assessment.

Patient factors

• Body habitus and soft-tissue depth.
• Prior scars and previous approaches.
• Infection risk and skin quality.
• Vascular disease, anticoagulation and pelvic bleeding risk.
• Neurological baseline, especially sciatic, femoral and obturator function.
• Bone quality and osteoporosis.
• Ability to tolerate lateral, prone or supine positioning.

Injury or disease factors

• Open wound location and contamination.
• Hip dislocation direction and time to reduction.
• Femoral head damage, marginal impaction or intra-articular fragments.
• Acetabular column and wall involvement.
• Pelvic ring stability and haemodynamic state.
• Revision implants, cement, screws, plates, cages or pelvic discontinuity.

Examination points to document

• Distal pulses and limb perfusion.
• Femoral, sciatic, obturator and lateral femoral cutaneous nerve symptoms where relevant.
• Abductor function if planning lateral or revision hip surgery.
• Skin scars and planned incision conflicts.
• Compartment or soft-tissue swelling in trauma.

Imaging determines the target and the safe corridor.

Plain radiographs

• AP pelvis for global alignment, hip joint status, pelvic ring asymmetry and implants.
• AP and lateral hip for arthroplasty planning, femoral morphology and component position.
• Judet oblique views for acetabular column and wall assessment when CT is not yet available.
• Inlet and outlet pelvis views for pelvic ring displacement and posterior ring assessment.

CT

CT is central for acetabular and pelvic ring surgery. It shows:

• anterior versus posterior column involvement
• posterior wall fragment size and marginal impaction
• quadrilateral surface displacement
• intra-articular fragments
• sacral fracture morphology
• safe iliosacral and transsacral screw corridors
• existing implant position or bone loss in revision surgery

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CT angiography

Use when there is suspected arterial injury, expanding haematoma, pelvic bleeding concern, absent pulses, revision cup migration near vessels, tumour surgery or intrapelvic hardware migration.

MRI

MRI is not routine for fracture approach selection but can help in tumour, infection, osteonecrosis, soft-tissue abscess and hip preservation planning.

A new deficit after a hip or pelvic approach is a clinical emergency of reasoning, not panic. Localise the lesion, decide if it is compressive and reversible, and act.

Approach selection is a sequence:

1. Define the pathology and reduction target.
2. Decide whether the patient needs damage-control, definitive fixation or staged reconstruction.
3. Review imaging in axial, coronal, sagittal and three-dimensional terms.
4. Identify danger structures and previous surgical planes.
5. Choose the least harmful exposure that gives enough access.
6. Plan fixation, implant removal, grafting, flap cover and closure before incision.
7. Have an extensile or bailout plan.

Positioning is part of the approach. It determines access, fluoroscopy, reduction ability, anaesthetic safety and whether a second approach remains possible.

The surgical technique section describes approach principles. Individual operations still require detailed procedure-specific planning.

Postoperative care depends on the operation, but approach-specific points matter.

Hip arthroplasty

• Check sciatic, femoral and peroneal nerve function.
• Check wound, haematoma and infection risk.
• Use approach-specific dislocation precautions where the surgeon considers them appropriate.
• Protect abductor repair after lateral approaches according to local protocol.
• Confirm component position and leg length on postoperative radiographs.

Acetabular and pelvic fixation

• Repeat neurological examination after surgery.
• Monitor haemoglobin, drains, wound swelling and pelvic bleeding risk.
• Use postoperative CT when reduction or screw placement needs confirmation.
• Weight-bearing depends on fracture stability, fixation quality and associated injuries.
• Monitor for DVT, heterotopic ossification, infection, nonunion and post-traumatic arthritis.

Outcomes depend more on pathology, surgical execution and patient factors than the name of the approach alone.

For THA, modern evidence suggests that direct anterior, lateral and posterior approaches can all achieve excellent outcomes when performed by experienced surgeons. Differences tend to involve early recovery patterns, dislocation direction, nerve symptoms, abductor morbidity, fracture risk and learning curve rather than a universal winner.

For acetabular fractures, reduction quality remains a major determinant of outcome. An approach that gives inadequate reduction access is worse than a larger approach chosen deliberately. Posterior wall comminution, marginal impaction, femoral head damage, delayed surgery, nerve injury and imperfect reduction worsen prognosis.

For pelvic ring injuries, outcome is influenced by haemodynamic injury, posterior ring reduction, neurological injury, associated trauma, chronic pain and rehabilitation access.

Hip and pelvic approach practice is shaped less by formal disease guidelines than by arthroplasty registries, trauma society principles and local resources. The unifying global principle is that the approach should reach the target safely in that patient and that complex acetabular and pelvic injuries belong in teams with the imaging, reduction tools and supporting specialties to manage them.

Global epidemiology

• Total hip arthroplasty is among the most common and most successful elective operations worldwide, with very high implant survival reported across major registries.
• The acetabular fracture population is ageing, with mean age rising from the late 30s toward the mid-40s and a growing proportion of anterior-column patterns and low-energy falls, according to PubMed-indexed contemporary reviews (Kelly et al., Injury 2020).
• Pelvic ring injuries follow a bimodal pattern: high-energy trauma in younger patients and fragility fractures of the pelvis in older patients, the latter rising with population ageing.

Side-by-side society positions

Registry evidence

• AOANJRR (Australia), NJR (England, Wales, NI and IoM), AJRR (US), SHAR (Sweden), the Norwegian and New Zealand registries collectively report excellent long-term THA survivorship and allow approach, fixation and bearing comparisons at population scale.
• Registries are the appropriate denominator for approach-specific signals such as dislocation, periprosthetic fracture and early revision; single-surgeon series cannot replace them.

High- versus limited-resource practice variation

• In well-resourced settings, CT, three-dimensional planning, intraoperative navigation, cell salvage, interventional radiology and dedicated pelvic trauma teams are routinely available.
• In limited-resource settings, plain radiographs and Judet views, careful clinical reduction, external fixation and damage-control principles carry more weight, and early referral of complex acetabular or pelvic injuries to a capable centre is often the safest decision.
• The constant across all settings is sound anatomy, a reduction-target-led approach, control of danger structures and a defined bailout.

These are the live debates an examiner uses to test judgement rather than recall. A safe answer acknowledges genuine equipoise and then states a defensible position.

Every card below is anchored to a verified PubMed-indexed source. Read the statistics carefully: they are exam-quotable because they come from the actual papers, not from approximations.