Table 3.

Components of revision burden [7] calculation.

Component of revision burden equation	Factors affecting component of equation
Numerator = revision joint replacement in a given period	•Population with prior primary joint surgery •Population with prior revision joint surgery •Criteria for revision or rerevision joint surgery •Availability (surgeons/hospital) to offer revision joint surgery •Population life expectancy •Definition of revision joint replacement
Denominator = revision and primary joint replacements in the same period	•Numerator •Criteria used for primary joint surgery (definition of surgical arthritis within a health system) •Population with surgical arthritis •Availability (surgeons/hospital) to offer primary joint surgery