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7 Cards in this Set
- Front
- Back
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Steel |
Composition 316L 3% moybdenum 16% nickeL L low carbon 0.03% Manufacture As for metals Properties S- strong and cheep T – ductile biocompatible fatigue resistance Pitting, stress + crevice corrosionE- Easy to manufacture E – Elasticity (high) L – low carbon 3% molybdenum 16% nickel Disadvantages Stress or crevice corrosion stress shielding |
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Titanium |
Composition Ti64V 6% Aluminium 4% Vanadium 90% Aluminium
Manufacture - as for metals
Properties Biphasic Less modulus mismatch- less stress shielding. Nail, stem Passivation layer - corrosion resistance Inert - biocompatible
Disadvantages Poor wear properties - no bearing surface Poor notch sensitivity Vanadium ions can be cytotoxic Expensive
Uses IM nails Plates Femoral stems
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Cobalt chrome |
Composition 60% cobalt 25% chromium 5% molybdenum
Manufacture - as per metals
Properties Excellent wear Good fatigue resistance+ corrosion Tough
Disadvantages Stress shielding Expensive
Use Bearing surface |
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Ceramic |
Composition Metallic + non metallic elements joined by covalent bonds Manufacture 1.prefabricated cast 2. Sintering or Hot Isostatic pressing 3. Transformational toughness Adding other elements to ceramic Properties - BWHITE B - Brittle W- wettable H- hard I - inert T- Transformational toughness E- low coEfficient of friction Use Bearing surface |
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history |
In summary, Mrs Smith is a 73-year-old retired right-handed headmistress who presents with several years history of intermittent shoulder pain. In the past year she has experienced increasing pain and stiffness of this shoulder. She denies any specific history of trauma. She has difficulties with activities of daily living particularly brushing her teeth, washing her face, etc. My provisional/working diagnosis is of glenohumeral osteoarthritis and I would like to examine the shoulder to confirm this. |
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Musculoskeletal Infection Society (MSIS) 2018 criteria for prosthetic joint infections |
Major criteria (diagnosis can be made when [1] major criteria exist) 1.sinus tract communicating with prosthesis, or 2. pathogen isolated by culture from 2 separate tissue/fluid samples from the affected joint Minor criteria (preoperative diagnosis) The below scores are added together to determine: ≥6 Infected 2-5 Inconclusive 0-1 Not Infected Serum 1.Elevated CRP (>10mg/L) or D-dimer (>860ng/mL) - 2 points 2. Elevated ESR (>30mm/h) - 1 point Synovial 1. elevated synovial WBC (>3,000 cells/µl) or LE - 3 points 2. Positive alpha-defensin - 3 points 3. elevated synovial PMN (>80%) - 2 points 4. Elevated synovial CRP (>6.9mg/L) - 1 point Inconclusive (inconclusive preop score or dry tap) 1. Preop score 2. Positive histology (>5 PMN per hpf in 5 hpf at x400 magnification (intraoperative frozen section of periprostehtic tissue) - 3 points 3. Purulence in affected joint - 3 points 4. Single positive culture - 2 points |
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Bone Cement |
•Poortensile strength •Moderate shear strength •Strong in compression •Brittle •Notch-sensitive •Young’s modulus between that of cortical and cancellous bone •Young’s modulus much less than orthopaedic metals •Viscoelastic Undergoescreep Undergoes stress relaxation |
