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Data on joint replacement due to osteoarthritis

Osteoarthritis is the single biggest reason for having a hip replacement or knee replacement.

National data on knee and hip replacements is collected and analysed by the National Joint Registry (NJR). Their 2012 annual report showed that:

  • 98% of first-time (initial) knee replacements recorded in 2011 in England and Wales (over 77,000) were due to osteoarthritis.*
  • 93% of first-time (initial) hip replacements recorded in 2011 in England and Wales (over 66,000) were due to osteoarthritis.*

Revision surgeries are more complex and include loosening, wear or dislocation of the artificial joint.

Figure 1 – The number of knee and hip replacements in England and Wales in 2011
Joint Type of joint replacement Number Equivalent percentage 

Initial replacement 79,516 94% 
Revision replacement 5,137 6%
Total 84,653 100%
Initial replacement 71,672 89%
Revision replacement 18,641 11% 
Total  80,314 100%


*National Joint Registry (2012), National Joint Registry for England and Wales, 9th Annual Report.

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