revision total hip replacement - global ortho revision total hip...revision total hip replacement...
TRANSCRIPT
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Revision Total Hip Replacement
DR. (PROF.) ANIL ARORAMS (Ortho) DNB (Ortho) Dip SIROT (USA)
FAPOA (Korea), FIGOF (Germany), FJOA (Japan)Commonwealth Fellow Joint Replacement
(Royal National Orthopaedic Hospital, London, UK)
Senior knee and Hip Joint Replacement SurgeonAssociate Director
Department of Orthopaedics and Joint ReplacementMax Superspeciality Hospital, Patparganj, Delhi (India)
Email: [email protected]
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Difficult Journey…..Revision THR
• Planning
• Preparedness
• Prayer
……. previous operative notes
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Planning
Why did earlier one “failed” ??
What implants are in.
How to remove them.
What bone stock will be left. Use classification
system for preparedness
What all Implants are needed
Need for allograft.
Postop Rehabilitation
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Why the earlier one “failed”………?
Aseptic loosening / Particle disease
Infection
Instability
Implant failure
Periprosthetic fracture
Any other cause
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Plain radiograph
AP
Orthogonal
Full Length Femur
Judet Views
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Judet’s Views
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4 parameters…..ACETABULAR EVALUATION
– Amount of superior migration of hip centre.
– Ischial osteolysis…superior border of obturator foramen (Loss of bone from inferior aspect of posterior column)
– Teardrop Osteolysis (Loss of bone from inferior aspect of anterior column, lateral aspect of pubis and medial wall)
– Medial Migration relative to Kohler’s line
• Outline your bone loss!
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A Crucial Identification : Pelvic Discontinuity
4 key elements:
Visible transverse fracture line
Medial shift of hemi-pelvis
Rotation of hemipelvis (superior relative to inferior)
Obturator foramen asymmetry
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Bone Scan : NPV
The sensitivity and negative predictive value of the indium leukocyte scan for infection are both very high, approaching 95% and 100%, respectively,
Useful >>>
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Try to rule out Infection..Reasonably
ESR Eeak 5-7 days operation, pre-operative levels in 3 months.
CRP Early peak 2-3 days after surgery,normal first 3 wks after operation.
IL-6 Peak - first 6 to 12 hours baseline- 3 Days
A combination of CRP and IL-6 has recently been shown to provide excellent sensitivity in the assessment of infection after THR.
Bottner F, Erren M, Wegner A, Winkelmann K, et al. Interleukin-6, procalcitonin and TNF alpha: markers of peri-prosthetic infection following total joint replacement. J Bone Joint Surg [Br] 2007;89-B:94-9.
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Perioperative testing for joint infection in patients undergoing revision total hip arthroplasty.Schinsky MF, Della Valle CJ, Sporer SM, Paprosky WG.J Bone Joint Surg Am. 2008 Sep;90(9):1869-75. 201 Revision THR
● Preop ESR < 30mm/hr & CRP < 10 mg/dL–NONE infected !!!!!!!!!!!!!!!!!
● ESR > 30mm/hr & CRP>10mg/dL & Synovial fluid WBC count > 3000 wbc/ml Strongly correlated with periprosthetic infection
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Implants
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All possible head sizes
Metal rings and cages
Cables
Pelvic reconstruction Plates
Constrained liners
Allogenic bone grafts
Keep set of implants with you for surgery
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Cups / Ring /Cage /
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Keep set of implants with you for surgery
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Allogenic bone grafts
Cables
Plates
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Exposure
Multiple Incision
• Try and Re-establish planes
• Identify and Isolate Sciatic Nerve
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Exposure : Wide Exposure
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Generous Release (Fibrous tissue
may be stronger than thin Papery
Bone)
Excise Pseudocapsule and metal
laiden tissue if any
Careful Dislocation
Exposure
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Sequence of Removal
• Femoral Stem (Head in
Uncemented)
• Acetabulam
• Cement
• Debridement
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Cemented Acetabular Removal
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Uncemented Acetabular Removal
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……..
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Femoral Implant Removal
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Don’t Hesitate to PerformETO
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ETO Advantages
• Enhancement of cemented and cementlessfemoral component removal.
• Exposure of the femoral diaphysis for bone grafting femoral deficiencies.
• Increased exposure of the acetabulum
• Correction of femoral deformities such as varusremolding.
• Improved soft-tissue tensioning of the trochanter and abductor mechanism.
• Increased trochanteric union rate.
• Decreased operative time.
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Cement Removal Set
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Equipment
• Flexible thin osteotomes for
cementless stem removal
• Image Intensifier
• Flexible Medullary Reamers
• Fiberoptic lighting
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High Speed Pneumatic Drills and Burr
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Orthosonics System for Cemented Arthroplasty Revision (OSCAR)
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Acetabular Reconstruction
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Paprosky Classification of Acetabular Bone Loss
“Severity of Bone Loss”
and
“Ability of remaining host bone
To provide INITIAL STABILITY to
Cementless Acetabular Cup
till bony ingrowth occurs”.
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Paprosky Classification of Acetabular Bone Loss
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Type 1 - Minimal deformity, Intact Rim
• Rim is intact and supportive without distortion
• Focal areas of contained bone loss
• Hemispherical cementlessimplant is almost completely supported by native bone and has full inherent stability
• No migration of the component
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Type 2 (A,B,C)
• Acetabulum is distorted.• At least 50% host bone contacting the surface
area of the component.• Anterior and posterior columns remain intact• May elevate hip centre to 1.5 cm to achieve
stability.
Xray: • Superior migration of the hip center is <3 cm• No significant osteolysis, Ischium or Teardrop
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Type 2 A- “Intact superior rim”with Superomedial bone Lysis
• Defect is contained
• Superior medial
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Type 2 B – “Absent Superior Rim” Superolateral Migration
• Superior rim is deficient for <1/3 Circumference
• Columns are supportive for a hemispherical cementless implant
• Defect is lateral
• Segmental defect
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Type 2 C- “Intact Rim”Localized destruction of medial wall
• Migration of the acetabularcomponent medial to Kohler line
• Medial wall defect
• Rim will support a hemispherical component
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Type 3 : More than 1/3 rim missing !
Superior Migration >3 cm
The remaining acetabular rim will notprovide adequate initial stability for thecomponent to achieve reliable biologicfixation.
Structural allograft or highly porous metalaugments are required to restore the centerof rotation to the proper anatomic locationand provide mechanical stability to theimplant.
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Type 3 A- Rim loss from 10-2.0’clock,
Supero-Lateral cup migration
• Defect involves >1/3 but not more than 1/2 the
circumference (10 .0’clock - 2.0’clock )
Up and Out !
• Migration >3 cm above theobturator line
• Ischial lysis <15 mm inferior to theobturator line
• Partial destruction of the teardrop.• Component will be at or lateral to
Kohler line and the ilioischial andiliopubic lines will be intact.
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Type 3A
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Type 3B - Bone loss from 9 - 5.0’clock around rim,
Supero-Medial cup migration
• Rim defect is >1/2 the circumference (9-5.0’clock)• High risk for occult pelvic discontinuity• < 40% host bone…. No inherent stability achievable
with a trial implant
Up and In!
• >3 cm of superior migration to the obturatorline
• Complete destruction of the teardrop• More extensive ischial osteolysis (>15 m
below the superior obturator line)• Migration medial to Kohler line
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Cages
• Lateralize the hip center
• Often lie quite vertical.
• Often lie in a Retroverted position
….so cement the Cup
In Appropriate Position
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Pelvic Discontinuity
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Other Options
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IMPACTION GRAFTING
Benefits Fills big defects Osteoconductive properties Moderate support features
Disadvantages Poor osseointegration Lysis of the bone graft High risk of infection
“The greater the extent of the coverage of the acetabular component by thegraft, the greater the rate of late failure”[Shinar AA, Harris WH. J Bone Joint Surg Am. 1997 Feb;79(2):159-68]
“…total survival rate of 87.5%, anti-protrusio cages and structural allografts…”[Regis D. et al. J Arthroplasty. 2008 Sep;23(6):826-32]
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IMPACTION GRAFTING
INTRAOP PAP 3 AFTER CUP REMOVAL
INTRAOPLOOSE CUP
POSTOPXRAY AFTER 2YEARSIMPACTION
GRAFTING
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Constrained AcetabularInsert
Primary and revision patients at high risk of hip dislocation due to
History of prior dislocation, Bone loss Joint or soft tissue laxityNeuromuscular disease Intraoperative instability
•Bone or musculature compromised by disease, infection or prior implantation, which cannot provide adequate support or fixation for the prosthesis.•Infection in or about the hip joint.• Skeletal immaturity.
YES
NO
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Paprosky Classification
of
Femoral Bone Loss
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Based on three variables
a) The location of bone loss (metaphyseal vs. diaphyseal)
b) The degree of remaining support of the proximal femur
(degree of cancellous bone loss)
a) The amount of isthmus remaining for diaphyseal fixation.
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Type I- Minimal Metaphyseal bone loss
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Type II- Extensive Metaphyseal bone loss
with Intact Diaphysis
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● Extensive Meta-
Diaphyseal bone loss
Type III A
● Minimum of 4 cm of
intact cortical bone
in the diaphysis
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● Extensive Meta-
Diaphyseal bone loss
Type III B
● Less than 4 cm of
intact cortical bone
in the diaphysis
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Type IV
Extensive Meta-diaphyseal
bone loss NONSUPPORTIVE
diaphysis
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Other Options
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Cement in cement
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77 Yr
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72 YR
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APC Femur
A reliable way to reconstruct in difficult scenario.
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APC Acetabulum
INTRAOP
INTRAOP
APC
PREOP
8 YRS POSTOP
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PreparednessBe ready for all sorts of possible complications
Massive bone defects
Fracture / Cortical perforation
Incomplete removal of implants/Hardware
Inability to achieve solid fixation
Neurovascular injury
Iatrogenic pelvic discontinuity
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Message
Need to learn Tips and Tricks
Always keep “Bail out” implants and
adequate amount of allograft.
Shall have done about 100 hips
Assist as many revisions as you can
(at least twenty) before venturing.
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