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Total Hip Arthroplasty

Total Hip Arthroplasty. BME 181 By: Erik Walder. What is total hip arthroplasty?. Total Hip Replacement Bone is sheared away and an artificial hip is implanted Osteoarthritis, trauma, and overuse make people candidates. How does the implant work?. The ‘stem’ is drilled into the femur

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Total Hip Arthroplasty

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  1. Total Hip Arthroplasty BME 181 By: Erik Walder

  2. What is total hip arthroplasty? • Total Hip Replacement • Bone is sheared away and an artificial hip is implanted • Osteoarthritis, trauma, and overuse make people candidates

  3. How does the implant work? • The ‘stem’ is drilled into the femur • The ‘ball’, also known as the bearing, acts as the femoral head • The ‘liner’ acts as the acetabulum

  4. Cemented vs. Un-cemented Implants • Cemented • Liner is permanently attached to the pelvis • Un-cemented • Liner is only temporarily attached • Liner consists of porous material compatible for bone growth • Bone grows and secures liner in place

  5. Metal Ball with Polyethylene Liner Wear Rate: 0.1 mm/yr Pros/Cons • Most common implant • Metal is usually made from cobalt chrome molybdenum alloy • Pieces from wear and tear can cause inflammation/bone loss

  6. Ceramic Ball with Polyethylene Liner Wear Rate: 0.05 mm/yr Pros/Cons • Harder than metal • Don’t scratch very much • Less wear means less inflammation/bone loss • More expensive • In the past ceramics were brittle and cracked • Not usual anymore

  7. Metal ball with Metal Liner Wear Rate: 0.01 mm/yr Pros/Cons • cobalt chromium alloy • Allows for a larger ball • More like natural joint • Increased range of motion • Fairly low wear rate • Particles from wearing may cause adverse health effects • May perform better over long term • More sizing options

  8. Ceramic Ball with Ceramic Liner Wear Rate: 0.0001 mm/yr Pros/Cons • Incredibly low wear rate • Very hard and strong • No particles from wear are dispersed through the body • No inflammation • No bone loss • A wide range of sizing to meet patient specific needs

  9. Picture References • http://www.mayoclinic.com/health/medical/IM00342 • http://www.bonesmart.org/hip_replacement.php?gclid=CNHJ-K_9jqECFd1n5QodrVJ_Mw • http://www.mayoclinic.com/health/medical/IM00341 • http://www.yalemedicalgroup.org/stw/images/125680.jpg

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