Orthopaedic Biomaterials in Total Joint Arthroplasty UC Berkeley February 21, 2006

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Orthopaedic Biomaterials in Total Joint
Arthroplasty UC Berkeley
February 21, 2006
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Total Hip Replacement

• Very effective pain relief and functional
  improvement
• Ten year survivorship of 90 to 95
• Twenty year survivorship of 80

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Polyethylene Stresses

• d with areas of unsupported polyethylene

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Percent of Unsupported Polyethylene
Median Values, n3
100
Holes Overlap Gaps
80
60
40
20
0
1
8
11
1
1
9
4
10
7
Holes
Duraloc
S-Rom
APR
Omnifit
Osteolock
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Percent of Unsupported Polyethylene
Median Values, n3
100
Holes Overlap Gaps
80
60
40
20
0
1
1
1
1
4
6
9
4
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Holes
RingLoc
PFC
S-Rom
HGP II
Reflection
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Intramedullary Step Cut
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Summary

• Total hip replacement is an effective treatment
  for severe osteoarthritis
• 90 95 ten year survivorship
• Failure most commonly due to UHMWPE wear
• Bone loss results from biologic reaction to wear
  debris
• Revision total hip replacement frequently
  requires allograft augmentation to restore bone
  stock