Implants

Please find the document 'Prostheses used in hip, knee, ankle, elbow and shoulder replacements 2018' in the right-hand column under 'PDF downloads'.

This accompanies the main NJR Annual Report and contains information on:

• Prostheses used in hip procedures

• Prostheses used in knee procedures

• Prostheses used in ankle procedures

• Prostheses used in elbow procedures

• Prostheses used in shoulder procedures

• Cement use and

• Bone substitute use

The Implant Scrutiny Committee reports Level 1 outlier implants to the MHRA. Since the committee’s formation in 2009 there have been four hip stems, nine hip acetabular (cup) components and 28 hip stem/cup combinations reported. Seven knee brands have been notified.

An implant is considered to be a Level 1 outlier when its Prosthesis Time Incident Rate (PTIR) is more than twice the PTIR of the group, allowing for confidence intervals. These are shown as the number of revisions per 100 prosthesis-years. As of March 2015, we have started to identify the best performing implants, these would have a PTIR less than half that of their group, allowing for confidence intervals. To date no implants have reached that level.

Components and constructs previously reported to MHRA, but no longer at Level 1, are not listed.

Hip implant performance

Table 1 Level 1 outlier stems/femoral components reported to MHRA. Table 2 Level 1 acetabular components reported to MHRA.Table 3 Level 1 outlier stem/cup combinations. Best performing hip implants

There are no hip implants or combinations performing statistically less than half their expected PTIR.

Knee implant performance

Table 4 Level 1 outlier implants reported to MHRA. All of these implants have been discontinued.

Best performing knee implants

There are no knee implants performing statistically less than half their expected PTIR.