In revision total hip arthroplasty, does repair of an extended trochanteric osteotomy require additional plate fixation?

Extended Trochanteric Osteotomy Fixation in Revision Hip Arthroplasty

Plate fixation (specifically claw-plate systems) provides superior biomechanical stability and clinical outcomes compared to cables alone for extended trochanteric osteotomy repair in revision total hip arthroplasty, particularly in complex cases with floating trochanteric fragments, weakened bone junctions, or when optimal abductor function restoration is critical.

Evidence-Based Fixation Strategy

Standard Fixation Approach

The typical closure technique involves 3-4 cerclage cables and/or double-stranded Luque wires: one prophylactic cable 1 cm distal to the osteotomy, 1-2 cables along the diaphyseal segment, and one Luque wire above the lesser trochanter 1. This approach achieves:

• 98% radiographic and clinical union rates
• Mean trochanteric migration of only 3 mm
• Migration >1 cm in just 7% of cases
• 10-year survivorship of 97% free of aseptic femoral loosening 1

When to Add Plate Fixation

Plate fixation is specifically indicated for:

1. Floating greater trochanters - when the fragment lacks stable bony contact
2. Intertrochanteric fractures requiring rotational stability - when cables alone cannot prevent rotation
3. Extended trochanteric osteotomy fragments with weakened proximodistal junctions - when structural integrity is compromised 2
4. Intraoperative fractures of the osteotomy fragment - when additional structural support is needed 3

Comparative Outcomes: Plate vs. Cables Alone

Biomechanical Superiority

A direct comparison study demonstrated that claw-plate fixation significantly outperforms cable-alone fixation 4:

• Abductor lever arm preservation: Claw-plate maintained normal anatomy versus significant decrease with cables alone (p < 0.05)
• Trochanteric migration: 1.7 mm less migration with plate systems (p < 0.05) 5
• Gait outcomes: 81% had no or slight limping with plates versus only 48% with cables (p = 0.007) 4
• Radiographic success: Significantly better Beals and Tower classification scores with plate fixation (p < 0.01) 5

Union Rates

While both methods achieve acceptable union:

• Claw-plate fixation: 85-88% union rate 3, 6
• Cable-alone fixation: 70-82% union rate 6
• Metallic wires alone: 82% union rate 6

Clinical Decision Algorithm

Use cables/wires alone when:

• Standard ETO with good bone quality
• Adequate soft tissue envelope
• No intraoperative complications
• Minimal comorbidities affecting healing

Add plate fixation when ANY of these present:

• Intraoperative fracture of osteotomy fragment
• Poor bone quality or osteoporosis
• Floating trochanter without stable contact
• Need for enhanced rotational control
• Previous failed cable fixation
• Extended osteotomy >16 cm requiring additional support
• Interprosthetic stress risers requiring bridging 1

Important Technical Considerations

Avoiding Common Pitfalls

1. Maintain vascularity: Minimize vastus lateralis stripping and preserve abductor attachments to the osteotomy fragment 1

2. Appropriate osteotomy length: 12-16 cm from greater trochanter tip to maximize vascular supply while ensuring adequate exposure 1

3. Rounded corners: Use high-speed pencil-tip burr to create rounded osteotomy corners, avoiding stress risers 1

4. Controlled anterior completion: Complete anterior limb by controlled fracture rather than complete saw cuts to preserve soft tissue attachments 1

5. Implant symptomatic burden: Trochanteric claws and plates have higher rates of symptomatic hardware, so reserve for cases with clear indication 1

Functional Outcomes

Both fixation methods improve Harris Hip Scores significantly, but plate fixation provides superior functional restoration 4:

• Better abductor mechanics
• Reduced limping (moderate-to-severe limping significantly reduced with plates, p = 0.007)
• Improved range of motion and routine activities 2

Long-term Results

At 10-year follow-up with claw-plate systems 2:

• Median Harris Hip Score: 47 preoperatively → 87 postoperatively (p < 0.01)
• Beals and Tower classification: 67% excellent, 21% good, 13% poor outcomes
• 100% osseous or fibrous union achieved

Complications

Postoperative greater trochanter fractures occur in 9% of cases regardless of fixation method 1. The most common complication with plate fixation is implant breakage (occurring in approximately 10% of cases), though this rarely requires revision if union has occurred 3.

The key distinction: While cables alone may achieve union, plate fixation provides superior biomechanical restoration of abductor function, which directly impacts patient mobility and quality of life—the outcomes that matter most.