Surgical Technique for Revision THA – Discussion

Archival Presentation Notice: This article modernizes the multimedia presentation “Surgical Technique for Revision THA – Discussion” originally presented and moderated by Douglas E. Padgett, M.D.. The historical Flash lecture has been reconstructed into the synchronized video slide presentation above, with the original file preserved in the digital archives (padgett_revisionthr_discussion_session13_8_10.swf).

1. High-Yield Summary

Revision total hip arthroplasty (THA) represents one of the most challenging frontiers in reconstructive orthopaedic surgery, requiring systematic management of complex bone deficiency, compromised soft-tissue envelopes, and distorted anatomical landmarks. Successful revision requires adherence to four fundamental operative tenets:

• Restoration of Hip Biomechanics: Precise re-establishment of the native hip center of rotation, horizontal and vertical femoral offset, and leg length equality while avoiding sciatic nerve traction injury.
• Rigid Biological Implant Fixation: Algorithmic component selection tailored to the degree of host bone loss, achieving stable initial press-fit mechanical fixation into viable vascularized bone to facilitate long-term osseointegration.
• Extensile Exposure & Bone Conservation: Judicious utilization of extensile surgical windows, including the extended trochanteric osteotomy (ETO), enabling atraumatic implant extraction, complete removal of foreign material/cement, and safe intramedullary instrument passage without cortical perforation.
• Instability Prevention: Multimodal restoration of myofascial abductor tension, proper implant orientation, elimination of component and bony impingement, and selective deployment of large-diameter femoral heads or dual-mobility bearings in high-risk patients.

2. Indications and Etiology

Revision THA is indicated when a previously implanted prosthetic hip construct experiences mechanical failure, biological degradation, or clinical compromise resulting in pain, progressive functional limitation, or impending structural catastrophe.

Primary Indications for Revision

• Aseptic Loosening & Osteolysis: Loss of mechanical fixation at the bone-implant or bone-cement interface driven by polyethylene, ceramic, or metal particulate-induced macrophage phagocytosis, osteoclast activation, and periprosthetic osteolysis.
• Recurrent Instability & Dislocation: Incompetence of the prosthetic containment mechanism stemming from component malposition, abductor mechanism rupture or avulsion, soft-tissue laxity, spinopelvic hypermobility, or impingement.
• Periprosthetic Joint Infection (PJI): Deep prosthetic bacterial colonization requiring single-stage revision, two-stage revision with antibiotic articulating spacers, or definitive irrigation and debridement with modular exchange (DAIR).
• Periprosthetic Femoral or Acetabular Fractures: Fractures occurring around well-fixed or loosened stems (e.g., Vancouver B2 and B3 femoral fractures) or complex pelvic discontinuity.
• Adverse Local Tissue Reaction (ALTR) & Trunnionosis: Mechanically assisted crevice corrosion at modular junctions (head-neck trunnion or modular stem junctions) resulting in pseudotumor formation, soft-tissue necrosis, and osteolysis.
• Structural Mechanical Failure: Stem fatigue fracture, liner dissociation, ceramic liner or head catastrophic fracture, or cup debonding.

Contraindications

• Absolute Contraindications: Uncontrolled active systemic sepsis; severe medical comorbidities posing prohibitive perioperative cardiopulmonary mortality risk; complete lack of reconstructable pelvic bone stock precluding viable host fixation; non-ambulatory status with absent motor control.
• Relative Contraindications: Active local skin ulceration or superficial infection along surgical access corridors; profound immunosuppression; severe non-compliance or cognitive impairment complicating postoperative dislocation precautions.

3. Preoperative Planning & Diagnostic Workup

Preoperative assessment in revision THA requires a rigorous, algorithmic investigation to establish the exact failure mechanism, exclude periprosthetic infection, quantify host bone stock deficiency, and formulate primary and contingency surgical plans.

Diagnostic Infection Exclusion Workup

Every painful or failed total hip arthroplasty must be presumed infected until proven otherwise. Serologic screening with erythrocyte sedimentation rate (ESR) and C-reactive protein (CRP) is mandatory. If serologic markers are elevated, or if clinical suspicion remains high despite normal serology, diagnostic hip joint aspiration under fluoroscopic or ultrasound guidance is performed. Synovial fluid is analyzed for total nucleated cell count, polymorphonuclear percentage (PMN%), alpha-defensin biomarker assay, leukocyte esterase, and aerobic and anaerobic extended cultures (held for a minimum of 14 days to capture slow-growing organisms such as Cutibacterium acnes).

Radiographic Assessment & Advanced Imaging

• Standard Radiographic Series: Low anteroposterior (AP) pelvis centered over the pubic symphysis, cross-table lateral of the affected hip, full-length AP and lateral femur views, and 45-degree Judet iliac/obturator oblique views when evaluating pelvic discontinuity or posterior column integrity.
• Spinopelvic Assessment: Standing and seated lateral lumbar spine and pelvic radiographs to evaluate functional pelvic tilt, sacral slope changes, and spinopelvic stiffening or hypermobility, which dictate required acetabular component anteversion.
• Computed Tomography (CT) with MARS Protocol: Metal Artifact Reduction Sequence CT provides 3D mapping of acetabular column loss, anterior and posterior rim erosion, retroacetabular osteolysis, and pelvic discontinuity.

Equipment & Specialty Armamentarium

• Specialized Extraction Instrumentation: Explant acetabular removal system with contoured blades; reverse-slap hammers; universal stem extractors; high-speed carbide and diamond-tipped burrs; motorized flexible intramedullary reamers; ultrasonic cement removal instrumentation (e.g., Orthosonics).
• Acetabular Reconstruction Inventory: Multi-hole revision acetabular shells; porous metal wedges, blocks, and buttress augments; cup-cage systems; dual-mobility revision constructs; and constrained acetabular liners available as back-up.
• Femoral Reconstruction Inventory: Modular tapered fluted titanium revision stems in multiple distal diameters (14–24 mm) and stem lengths (140–300 mm); proximal bodies with variable offsets, neck angles, and heights; prophylactic cerclage cables and tensioners.

4. Patient Positioning & Surgical Exposure Corridor

Stable positioning and wide extensile visualization are non-negotiable prerequisites for safe component removal and anatomical reconstruction.

Patient Setup & Positioning Safeguards

The patient is placed in the strict lateral decubitus position on a radiolucent operating table, secured with well-padded anterior pubic and posterior sacral rigid positioners. An axillary roll is positioned beneath the dependent thorax to decompress the brachial plexus, and the dependent peroneal nerve and lateral malleolus are protected with silicone gel pads. The entire operative limb and hemipelvis are prepped and draped free to allow unhindered multiplanar range of motion and intraoperative fluoroscopic visualization.

Extensile Surgical Approach & Neurovascular Protection

The extensile posterior (Moore/Southern) approach is the workhorse corridor for complex revision THA. The skin incision incorporates or excises previous surgical scars, extending proximally along the posterior border of the greater trochanter and curving gently across the gluteal fascia, continuing distally along the lateral femoral shaft. The tensor fasciae latae and gluteus maximus are divided in line with their fibers.

Internervous & Intermuscular Plane: The posterior approach exploits the intermuscular plane between the gluteus maximus (inferior gluteal nerve) and the tensor fasciae latae (superior gluteal nerve). The sciatic nerve is vulnerable within post-surgical scar tissue. In revision scenarios with extensive posterior column osteolysis, scar entrapment, or planned limb lengthening, the sciatic nerve must be formally identified, visualized, and mobilized along its course from the sciatic notch down to the quadratus femoris. Retractors must never be placed blindly behind the posterior column or over the ischial spine.

5. Component Extraction Techniques & ETO

Careless component extraction can transform a manageable reconstructive problem into a catastrophic bony void. Host bone conservation takes absolute priority over implant destruction.

Acetabular Component Extraction

After removal of modular polyethylene liners and dome screws, tissue ingrowth around well-fixed shells is disrupted. Rather than applying torque with osteotomes—which risks fracturing the anterior or posterior columns—a curved-blade extraction system (e.g., Explant) is utilized. The rotating blades match the spherical outer contour of the cup, shearing the porous ingrowth interface with minimal bone resection (<1 mm). In loose shells, fibrous tissue is divided circumferentially with a thin curved osteotome prior to gentle cup levering.

Stem Extraction & Cement Mantle Removal

For loose cementless stems, an axial slap-hammer extractor connected to the stem trunnion is deployed. For well-fixed stems, extraction requires methodical clearance of proximal ingrowth. High-speed narrow carbide burrs, flexible osteotomes, and pencil burrs are used to detach the proximal metaphyseal bone interface. If the stem remains rigidly fixed in the diaphysis, an extended trochanteric osteotomy (ETO) must be performed promptly to avoid catastrophic femoral shaft comminution.

Extended Trochanteric Osteotomy (ETO) Technique

The ETO provides direct longitudinal access to the femoral intramedullary canal, eliminates the proximal impingement of the trochanter, and preserves the continuous muscular attachment of the abductor complex (gluteus medius and minimus) to the vastus lateralis:

• Prophylactic Distal Cable: A cerclage cable is placed and tensioned around the femoral diaphysis approximately 1 to 2 cm distal to the planned osteotomy exit to arrest hoop stress and prevent distal propagation of a fracture.
• Osteotomy Dimensions: The length of the ETO is determined by the length of the well-fixed stem or distal cement plug, typically 12 to 15 cm measured from the tip of the greater trochanter.
• Cortical Cuts: A longitudinal osteotomy is created using a high-speed pencil burr or oscillating saw through the posterior cortex just anterior to the linea aspera. Transverse distal cut is rounded to eliminate stress risers. The osteotomy fragment, comprising one-third of the femoral circumference, is mobilized anteriorly as a vascularized osteomuscular sleeve.
• Cement Clearance: With the canal opened, cement fragments, distal plugs, and fibrous membranes are systematically removed under direct vision using ultrasonic instrumentation and reverse-hook curettes.

6. Acetabular Reconstruction: Classification & Strategy

Acetabular reconstruction is dictated by the structural integrity of the supportive columns and walls, classified systematically using the Paprosky Classification system.

Paprosky Acetabular Deficiency Classification

Restoration of the Anatomical Center of Rotation

The true anatomical hip center must be restored to optimize abductor lever arms and prevent prosthetic impingement. In Paprosky Type IIIA and IIIB defects, porous metal wedges (trabecular titanium or tantalum) are anchored to the host ilium with cancellous screws to reconstruct the structural bone void. The hemispherical revision shell is then inserted against the augment and remaining viable host bone, secured with multiple trans-fixation dome screws into the dense bone corridor of the posterior column and sciatic buttress. The shell-augment interface is bonded with a thin mantle of polymethylmethacrylate (PMMA) or interlocking modular hardware.

7. Femoral Reconstruction: Modular Fluted Tapered Stems

Severe proximal femoral bone loss precludes reliance on metaphyseal stem fixation. The modern gold standard for femoral revision is distal diaphyseal bypass fixation utilizing cementless modular fluted tapered titanium stems.

Paprosky Femoral Bone Loss Classification

• Type I: Minimal metaphyseal bone loss with intact proximal calcar and diaphysis. Reconstructed with standard primary cementless stems.
• Type II: Extensive metaphyseal bone loss with unsupportive calcar; intact diaphyseal isthmus. Managed with calcar-replacing or tapered fluted stems.
• Type IIIA: Unsupportive metaphysis with >4 cm of intact diaphyseal cortical bone distal to the lesser trochanter. Managed with distal-fixing fluted tapered stems.
• Type IIIB: Severely compromised diaphysis with <4 cm of intact diaphyseal isthmus. Managed with long modular tapered fluted stems or impaction grafting.
• Type IV: Complete loss of metaphyseal and diaphyseal architecture with widened, stovepipe canal. Requires total femoral replacement, proximal femoral allograft-prosthesis composite (APC), or customized distal fluted fixation.

Surgical Principles of Modular Fluted Tapered Stems

Modular fluted tapered stems offer decisive intraoperative advantages over monoblock cylindrical stems. By decoupling distal diaphyseal stem fixation from proximal body geometry, the surgeon can independently address three separate biomechanical variables:

• Distal Axial & Rotational Stability: Straight or bowed fluted conical stems provide splined rotational stability and axial taper wedge-fit within the cylindrical diaphyseal isthmus over a minimum of 2 to 3 cm of healthy cortical contact.
• Independent Anteversion Adjustment: The proximal body can be rotated 360 degrees on the distal stem taper prior to locking, allowing fine-tuning of version to perfectly match the orientation of the revision acetabular cup and spinopelvic dynamics.
• Independent Leg Length & Offset Correction: Proximal body heights (calcar-replacing, standard, or high-offset) restore soft-tissue abductor tension and leg length without compromising distal stem engagement depth.

8. Extended Trochanteric Osteotomy Fixation & Closure

Reconstruction and stable fixation of the ETO fragment are paramount to achieve bony union, prevent proximal abductor escape, and eliminate distal stem micromotion.

Rigid Anatomical Reconstitution Closure

Following final stem seating and modular assembly, the ETO fragment is reduced anatomically against the femoral diaphysis. Anatomical reduction restores the abductor lever arm and establishes broad cortical contact for primary bone healing:

• Cerclage Array: A minimum of two to three 2.0-mm cobalt-chromium or titanium cerclage cables are deployed across the osteotomy fragment.
• Tensioning Protocol: Cables are sequentially tensioned to 50–70 Nm using a calibrated tensioner. The most distal cable on the osteotomy fragment is secured first, compressing the lateral cortex against the stem, followed by the proximal trochanteric cables.
• Scaffolding versus Reconstitution: Recent clinical cohort data demonstrate that anatomical reconstitution closure provides superior resistance to distal stem subsidence compared to loose scaffolding bridges, achieving osteotomy union rates exceeding 98%.

9. Management and Prevention of Postoperative Instability

Dislocation remains the single most common early complication following revision THA, occurring in up to 10% to 15% of historical cohorts. Preventing instability requires systematic correction of component orientation, restoration of the offset-to-length ratio, and intelligent bearing selection.

Bearing Selection Corridors

• Large-Diameter Femoral Heads (36–40 mm): Standard first-line intervention in patients with adequate cup dimensions and intact abductor musculature, providing increased jump distance and primary range of motion prior to neck-liner impingement.
• Dual-Mobility Constructs: Highly effective in patients with recurrent dislocation, neuromuscular impairment, spinopelvic stiffness, or extensive soft-tissue compromise. A mobile polyethylene bearing articulates within a polished metal shell or liner, while a small inner head articulates within the poly insert. Dual mobility provides large effective head diameters (40–54 mm), dramatically lowering re-dislocation rates without the high mechanical failure rates seen with constrained liners.
• Constrained Acetabular Liners: Strictly reserved as a salvage option for patients with non-functioning or absent abductor mechanisms and severe neurological dysfunction. Because constrained liners transfer substantial shear forces directly to the cup-bone interface, they carry elevated risks of premature aseptic loosening and mechanical liner dissociation.

10. Rehabilitation Protocol & Perioperative Care

Postoperative rehabilitation must balance early mobilization to mitigate cardiopulmonary and thromboembolic risks against structural protection of healing bone-implant interfaces and osteotomies.

Phase-by-Phase Rehabilitation Protocol

• Phase I: Immediate Protection (Weeks 0–6):
  • Weight-Bearing: Touch-down weight-bearing (TDWB, 20–30 lbs) with a walker or crutches if an ETO, structural porous augment, or extensive acetabular reconstruction was performed. Weight-bearing as tolerated (WBAT) is permitted only in uncomplicated revisions with rigid, undisturbed diaphyseal press-fit.
  • Active Precautions: Strict posterior hip precautions (avoid flexion >90 degrees, internal rotation past neutral, and adduction past midline). An abduction pillow is utilized in bed. No active abduction against resistance to protect the ETO.
• Phase II: Intermediate Consolidation (Weeks 6–12):
  • Progression: Following clinical and radiographic confirmation of ETO healing and implant stability at 6 weeks, weight-bearing advances to 50% partial weight-bearing for 2 weeks, progressing to full WBAT with a single crutch or cane.
  • Physical Therapy: Active-assisted range of motion; closed-chain kinetic exercises; gentle isometric abductor and gluteal activation.
• Phase III: Advanced Strengthening (>12 Weeks):
  • Weaning off assistive ambulation devices; progressive resistance training; balance and proprioception retraining; functional gait normalization.

11. Complications & Salvage Strategies

Revision THA entails substantially higher complication profiles than primary arthroplasty, mandating vigilant intraoperative anticipation and established rescue protocols.

12. Clinical Controversies & Panel Discussion

During complex revision THA symposiums and faculty panels, several technical controversies continue to generate active debate among adult reconstruction specialists.

Controversy 1: Modular versus Monoblock Fluted Tapered Stems

While monoblock fluted tapered stems eliminate the risk of modular junction fretting, corrosion, and catastrophic stem fatigue fracture, modular designs afford the surgeon independent control over distal stem axial stability and proximal body version, offset, and leg length. Level I systematic reviews demonstrate that modular stems achieve equivalent long-term survivorship (96% at 5–10 years) with significantly lower intraoperative fracture rates and superior ease of version adjustment in distorted femoral anatomies.

Controversy 2: Dual Mobility versus Constrained Liners for Instability

Constrained liners were historically favored for recurrent instability, but high rates of aseptic loosening (10% to 20% at 5 years) due to rigid stress transfer have led to widespread adoption of dual-mobility articulations. Comparative meta-analyses show dual-mobility constructs reduce recurrent dislocation rates to under 3% with substantially lower mechanical complication profiles, making dual mobility the clear intervention of choice except in the total absence of abductor function.

Controversy 3: Management of Pelvic Discontinuity: Distraction Porous Metal vs. Custom Triflange

Pelvic discontinuity in Paprosky IIIB defects poses extreme biological and mechanical hurdles. The acetabular distraction technique utilizes highly porous trabecular metal cups and modular augments spanning the discontinuity, relying on biological osseointegration across the ilium and ischium. Conversely, custom 3D-printed triflange acetabular components (CTAC) utilize patient-specific screw fixation corridors across the ilium, ischium, and pubis. While CTAC provides immediate rigid bridging, modular trabecular metal distraction systems offer lower inventory lead times and robust biological survivorship exceeding 90% at 5-year follow-up.

13. Evidence-Based Synthesis

Modern clinical decision-making is grounded in high-quality randomized controlled trials and prospective registry analyses, corroborated by seminal biomechanical and anatomical descriptions.

14. References

• Wang D, Li H, Zhang W et al. Efficacy and safety of modular versus monoblock stems in revision total hip arthroplasty: a systematic review and meta-analysis. J Orthop Traumatol. 2023. doi:10.1186/s10195-023-00731-5 [Level I: Systematic Review / Meta-Analysis]
• Koutalos AA, Varitimidis S, Malizos KN et al. Clinical, functional and radiographic outcomes after revision total hip arthroplasty with tapered fluted modular or non-modular stems: a systematic review. Hip Int. 2022. doi:10.1177/11207000211004383 [Level I: Systematic Review / Meta-Analysis]
• Paprosky WG, Perona PG, Lawrence JM. Acetabular defect classification and surgical reconstruction in revision arthroplasty. A 6-year follow-up evaluation. J Arthroplasty. 1994. doi:10.1016/0883-5403(94)90135-x [Level IV: Landmark Classification & Retrospective Cohort]
• Sanghavi SA, Paprosky WG, Sheth NP. Evaluation and Management of Acetabular Bone Loss in Revision Total Hip Arthroplasty: A 10-year Update. J Am Acad Orthop Surg. 2024. doi:10.5435/JAAOS-D-23-00645 [Level IV: Comprehensive Review & Algorithmic Update]
• Wetters NG, Murray TG, Moric M et al. Risk factors for dislocation after revision total hip arthroplasty. Clin Orthop Relat Res. 2013. doi:10.1007/s11999-012-2561-7 [Level III: Retrospective Case-Control Study]
• Shaik A, Akram N, Al-Saadi M et al. Dual Mobility vs Constrained Liners in Managing Instability After Revision Total Hip Arthroplasty: A Systematic Review and Exploratory Cost-Effectiveness Model. Cureus. 2026. doi:10.7759/cureus.108186 [Level I: Systematic Review & Decision-Analytic Model]
• Cacciola G, Braconi L, Bosco F et al. Outcomes of modular stem for the treatment of periprosthetic femoral fracture: a systematic review of the literature. Ann Jt. 2023. doi:10.21037/aoj-23-27 [Level I: Systematic Review / Meta-Analysis]
• Jolissaint JE, Rodriguez S, Sanchez LA et al. Subsidence Starts Distally: Scaffolding Versus Reconstitution Closure of the Extended Trochanteric Osteotomy in Revision Total Hip Arthroplasty. J Arthroplasty. 2026. doi:10.1016/j.arth.2026.05.071 [Level III: Comparative Cohort Investigation]

15. Master Class Pro-Tip

Master Class Surgical Pearl: When reaming the distal femoral diaphysis for a modular tapered fluted stem following an extended trochanteric osteotomy, always place a prophylactic cerclage cable approximately 1 to 2 cm distal to the osteotomy exit before passing the first conical reamer. As the conical reamer engages the cylindrical cortical isthmus, hoop stresses can propagate a catastrophic longitudinal fracture down the femoral shaft unnoticed. The prophylactic cable acts as a rigid circumferential stop, neutralizing hoop tension and guaranteeing that distal scratch-fit is achieved safely.

Master Class Surgical Pearl: Prophylactic Distal Cable Protection During Diaphyseal Preparation