Table 2.

Summary of studies comparing cost effectiveness of UKA and TKA

S. no.	Author	Year	Type of study	Country	Mean age (years)		Number of cases		Mean hospital stay (days)		Cost effectiveness/comments
Based on registry data					UKA	TKA	UKA	TKA	UKA	TKA
1	Ghomrawi et al. [162]	2015	Markov decision model	Swedish registry	45–85	45–85	—	—	—	—	35,000 (85 years) to 46,600 (45 years) USD for UKA versus 42,000 to 47,600 USD for TKA
2	Peersman et al. [163]	2014	Markov decision model	Belgian registry	—	—	—	—	3	5	UKA 2807 Euro less costly than TKA
3	Willis-Owen et al. [17]	2009	Retrospective	UK registry	—	—	—	—	5.9	8.3	UKA 1761 Euro less costly compared with TKA
4	Koskinen et al. [13]	2008	Retrospective	Finnish registry	65	70	1886	48,607	8.5	10.4	Costs saved by lower implant prices and shorter hospital stay for UKA would not cover costs of extra revisions.
5	Slover et al. [164]	2006	Markov decision model	Norwegian registry	—	—	—	—	—	—	UKA 200 USD less costly than TKA
6	Robertson et al. [165]	1999	Retrospective	Swedish registry	—	—	10,624	15,437	10.7	12.3	UKA 1645 USD less costly than TKA
Based on literature review
7	Konopka et al. [159]	2015	Markov decision model	USA	—	—	—	—	—	—	24,636 USD total medical direct cost for UKA compared with 24,761 USD for TKA
8	Smith et al. [166]	2014	Markov decision model	UK	70	70	—	—	—	—	5235 Euro for UKA versus 6805 Euro for TKA
9	SooHoo et al. [161]	2006	Markov decision model	USA	—	—	—	—	—	—	2562 USD less lifetime treatment cost with UKA compared with TKA
Based on within-study analysis data
10	Shankar et al. [167]	2015	Prospective	USA	63.9	63.9	64	64	2.3	3.8	11,397 USD for UKA versus 16,243 USD for TKA
11	Xie et al. [168]	2008	Prospective	Singapore	63	67	102	431	5.3	7.7	6824 USD for UKA versus 8513 USD for TKA
12	Yang et al. [169]	2003	Prospective	Singapore	65.1	65.5	50	50	3.6	6.9	8700 USD for UKA versus 12,000 USD for TKA (total hospital bill)