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Extended trochanteric osteotomy in orthopaedics 10 marks pg answer with flow chart and images

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A clean medical flowchart titled "Extended Trochanteric Osteotomy (ETO) - Surgical Decision & Technique Flowchart". The flowchart should flow top to bottom with the following nodes connected by arrows: 1. "INDICATION FOR ETO" box at top (with sub-bullets: Well-fixed femoral stem, Varus malpositioned stem, Revision THA, Femoral component extraction, DDH/ankylosis/protrusio, Periprosthetic fracture with stem). Arrow down to 2. "PREOPERATIVE PLANNING" box (Pre-op X-ray templating, Assess stem length, Bone stock, Plan ETO length = stem length + 2cm). Arrow down to 3. "PATIENT POSITIONING" (Lateral decubitus position, Posterior approach). Arrow down to 4. "EXPOSURE" (Posterolateral incision, Split fascia lata, Expose lateral femoral cortex, Elevate vastus lateralis off linea aspera). Arrow down to 5. "ETO CUTS" diamond shape (Mark osteotomy with cautery, Posterior longitudinal cut at sagittal midline, Anterior cortex perforated with osteotome, Distal transverse cut, Fragment elevated laterally like opening a book). Arrow down to 6. "FEMORAL CANAL EXPOSURE" (Access intramedullary canal, Remove cement/stem, Insert revision implant). Arrow down to 7. "FIXATION OF ETO FRAGMENT" (Replace fragment, Cobalt-chrome cerclage cables x2-3, Trochanteric plate optional, Figure-of-8 cable fixation). Arrow down to 8. "COMPLICATIONS" box in red (Nonunion, Cable breakage, Trochanteric migration, Fracture propagation, Abductor weakness). The design should use blue and white colors with clear readable Arial font on a white background, professional medical illustration style.

I now have everything needed for a complete, exam-standard 10-mark answer. Here it is:

Extended Trochanteric Osteotomy (ETO)

10-Mark Answer | Campbell's Operative Orthopaedics, 15th Ed. 2026

Definition

Extended Trochanteric Osteotomy (ETO) is a proximal femoral osteotomy in which a segment of the lateral femoral cortex of variable length is raised in continuity with the greater trochanter, effectively opening the proximal femur like a "book" to expose the intramedullary canal. It was popularized by Younger, Duncan, and Masri as an adjunct to revision THA.

Types of Trochanteric Osteotomy

Three basic types are used in hip arthroplasty (Campbell's Fig. 4.71):
TypeFeatureIndication
Standard/ConventionalOsteotomy at base of trochanter onlyComplex acetabular revision, protrusio cage
Trochanteric SlideSagittal-plane cut, includes vastus lateralis originDirect lateral approach revisions
Extended (ETO)Greater trochanter + lateral femoral cortex raised en blocWell-fixed stems, varus malposition, revision THA
  • Campbell's Operative Orthopaedics, 15th Ed. p.279-280

Indications for ETO

  1. Removal of well-fixed, fully coated press-fit cementless femoral stems (primary indication)
  2. Revision of femoral stems placed in significant varus
  3. Revision THA - to facilitate exposure of femur and acetabulum
  4. Periprosthetic femoral fractures around a well-fixed stem
  5. Complex primary THA - ankylosis/hip fusion, severe protrusio acetabuli, high dislocation in DDH
  6. When the bony bed for a standard osteotomy would be compromised (e.g., trochanter filled with cement)
  7. To allow distal advancement of abductors when residual laxity causes hip instability
Key rule: ETO is used only when a cementless femoral reconstruction is anticipated, because a large segment of lateral cortex is removed, rendering cementing techniques imperfect.

Surgical Technique (Posterior Approach)

ETO Surgical Steps - Mayo Clinic Illustration
Steps A-E: (A) Mark posterior ETO line, (B) Elevate vastus lateralis, (C) Reflect ETO fragment laterally, (D) Use Gigli saw for distal transverse cut, (E) Reattach with cerclage cables. [Mayo Clinic / JBJS]
Step-by-step:
1. Positioning & Approach
  • Patient in lateral decubitus position
  • Posterior approach via posterolateral incision centered over greater trochanter
2. Exposure
  • Split fascia lata; expose lateral femoral cortex
  • Elevate the vastus lateralis off the linea aspera (laterally), exposing the lateral femoral shaft
  • Caution: If a previous anterolateral approach was made, elevating the lateralis off the linea aspera may devascularize it, causing catastrophic muscle necrosis
3. Planning the Osteotomy
  • Mark the lines of the osteotomy with electrocautery
  • Fragment length = length of femoral stem + approximately 2 cm distally (typically 10-15 cm from GT tip)
4. Making the Cuts
  • Posterior longitudinal cut: close to the sagittal midline of the femur (posterior to the mid-lateral line)
  • Anterior cut: avoid stripping the vastus lateralis; instead, use a small osteotome to perforate the anterior femoral cortex through the vastus lateralis
  • Distal transverse cut: completed with a Gigli saw or oscillating saw
  • The osteotomy fragment is completed by inserting the osteotome underneath the trochanter and applying a prying (book-opening) motion
5. Canal Access
  • ETO fragment is reflected laterally, exposing the intramedullary canal
  • Cement, well-fixed stem, or membrane can be removed under direct vision
  • New revision femoral component is inserted
Posterior approach drill holes marking for ETO
Posterior approach showing gluteus medius (A), retractor (B), vastus lateralis (C), and multiple drill holes at proposed osteotomy line (D)

Fixation of the ETO Fragment

Trochanteric slide technique - sagittal osteotomy plane
Trochanteric slide technique orientation - shows sagittal-plane cut with blue line
  • ETO fragment is reduced back and secured with cobalt-chrome cerclage cables (2-3 cables; NOT stainless steel - less risk of fretting corrosion)
  • Cable fixation technique:
    • Horizontal cable passed under the vastus lateralis
    • Vertical cable in a figure-of-eight pattern in two planes
    • Distal cerclage cable just distal to the lesser trochanter
    • Anterior cable passed through an oblique drill hole in the greater trochanter
Dall-Miles cable grip system
Dall-Miles cable-grip device with proximal hooks, bridges, and distal teeth for trochanteric reattachment
  • Trochanteric plate options: Accord plate or similar devices with proximal hooks + plate extension fixed to femur with cerclage cables (Fig. 4.77)
  • Some revision components allow a trochanteric plate to bolt directly into the femoral component
Post-operative X-rays showing fixation
Post-op X-rays: (A) Wire fixation, (B) Dall-Miles cable-grip plate - both showing trochanteric union

Keys to Achieving Union

  • Anatomic reduction OR slight distal overlap of the trochanter leads to union within 6 months
  • Residual superior and medial tilt leads invariably to delayed union or nonunion
  • Compression must be applied across the osteotomy
  • Hip should NOT be abducted more than 10-15 degrees during reattachment, or fixation strain and avulsion may follow
  • A biplanar/chevron osteotomy offers greater resistance to anteroposterior displacement than uniplanar

Lakstein Modification (Modified ETO)

  • The posterior capsule and short external rotators are left intact to reduce the risk of postoperative dislocation
  • Particularly useful in revision surgery where instability is a concern

Flowchart

ETO Decision and Technique Flowchart

Postoperative Management

PhaseProtocol
ImmediatePartial weight bearing with walker
6 weeksProtected weight bearing until radiographic union
Full weight bearingDelayed until trochanteric union confirmed on X-ray (usually 3-6 months)
PhysiotherapyAbductor strengthening program; avoid active hip abduction until union

Advantages of ETO

  1. Excellent direct visualization of the intramedullary canal
  2. Protects surrounding soft tissues during extraction
  3. Avoids iatrogenic femoral shaft fracture during stem removal
  4. Allows controlled, predictable access to well-fixed implants
  5. Fragment heals with biological bone-to-bone union (reliable if fixed correctly)
  6. Allows distal advancement of abductors to improve abductor function

Complications

ComplicationDetails
NonunionMost serious complication; 25% reported with wire techniques; reduced with cable systems
Trochanteric migrationFragment displaces proximally; causes abductor weakness, Trendelenburg gait
Cable/wire breakageFatigue failure of fixation hardware
Persistent limpAbductor weakness from migration or nonunion
Fracture propagationOsteotomy may extend distally if cuts inadequate
Increased blood lossMore than standard approaches
Delayed rehabilitationDue to restricted weight-bearing
BursitisFrom prominent hardware
Nerve injurySciatic nerve at risk during posterior cuts

Summary Points for Exam

  • ETO = greater trochanter + lateral femoral cortex raised en bloc
  • Used only with cementless femoral reconstruction
  • Length = stem length + 2 cm
  • Fragment fixed with cobalt-chrome cables (not stainless)
  • Anatomic or slightly distal reduction gives best union
  • Lakstein modification preserves posterior capsule to reduce dislocation risk
  • Nonunion is the most feared complication
  • Campbell's Operative Orthopaedics, 15th Ed. 2026, pp. 278-281
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