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Censoring events

Events such as patient death mean that a complete follow-up from the index operation to its subsequent revision is not possible. As far as the EPRD is concerned such censoring events may also include patients that are lost to further follow-up as a result of changing health insurer. In such cases arthroplasties are considered to have reached a premature end of service life, but are not considered to have failed.

Ceramicised metal

Implant components that consist of a zirconium alloy substrate and a ceramic surface modification - oxidised zirconium alloy.

Coated metal

Implant components that have been coated with ceramics (e.g. titanium nitride).

Complementary surgery

Patellar resurfacing following primary bicondylar knee arthroplasty on the same joint affected by "normal" progression of the disease, is a complementary operation, rather than a revision operation.

Confidence interval

Interval that contains the true value within a specified probability range (confidence level)

Constraint

Knee replacements are characterised by their level of constraint (stabilisation). In this report, we define “unconstrained” knee systems as cruciate-retaining, cruciate-retaining/sacrificing, pure cruciate sacrificing and also posterior stabilised systems without varus-valgus stabilisation. Varus-valgus stabilised and (rigid/rotational) hinge systems are considered as "constrained".

Cruciate retaining

Design preserving the posterior cruciate ligament without constraining knee motion/kinematic.

Cruciate retaining/sacrificing

The design is suitable for both a cruciate ligament-retaining or a replacement procedure.

Cruciate sacrificing

Design replacing the posterior cruciate ligament with kinematic, which partially permits a limited relative motion in all three planes.

Cup

See: "Acetabular component".

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