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Table 1 Model parameters

From: Economic evaluation of access to musculoskeletal care: the case of waiting for total knee arthroplasty

Health state utility (QALY)

Base case

Sensitivity analysis

 End-stage Knee OA

0.6

0.4-0.8

 End-stage knee OA with treatment bridge

0.7

0.6-0.9

 Primary TKA

0.9

0.6-0.9

 Revision TKA

0.85

0.6-0.9

 Recovery from revision TKA

-0.1

-0.25-0

 Recovery from early TKA complication

-0.20

-0.40-0

Transition probabilities

  

 Early complication after TKA

0.01

0-0.05

 Failure to revision of primary TKA (annual)

  

Years 0-9

0.005

0-0.02

Years 10-19

0.01

0-0.05

Years 20+

0.02

0-0.05

 Failure to revision of revision TKA (annual)

  

Years 0-9

0.01

0-0.04

Years 10-19

0.02

0-0.08

Years 20+

0.04

0-0.10

 All-cause mortality

Life Tables

None

 30-Day mortality after primary TKA

0.007

0-0.014

 30-Day mortality after revision TKA

0.01

0-0.02

 Wait for TKA

2 years

3 weeks to 5 years

Costs

  

 Indirect costs of knee OA

$10,369

0-$20,000

 Direct costs of knee OA (Non-operative Treatment Bridge)

$2,500

0-$3,883

 Primary TKA

$26,865

$20,000-$30,000

 Revision TKA

$35,542

$30,000-$40,000