Table 2

Basic characteristics of included studies

Author	Evidence	Design	Matching	RA		CA	Follow-up	Quality score	Country
Author	Evidence	Design	Matching	No	Robot type	No	Follow-up	Quality score	Country
Lim et al 20158	2b	RCT	12 345	24	ROBDOC	25	24 months	RCT	Korea
Nakamura et al 20109	2b	RCT	1234	75	ROBDOC	71	5 years	RCT	Japan
Nishihara et al 200610	2b	RCT	12	78	ROBDOC	78	24 months	RCT	Japan
Hananouchi et al 200711	3b	RP	13	31	ROBDOC	27	24 months	★★★★★★★	Japan
Siebel et al 200512	3b	RP	12	36	CASPAR	35	17.9 months	★★★★★★	Germany
Domb et al 20146	3b	R	12 345	50	MAKO	50	NS	★★★★★★★	USA
Domb et al 201513	3b	R	12	228	MAKO	708	NS	★★★★★★	USA

Design: R, retrospective; RP, retrospective design. Matching: (1) age; (2) gender; (3) body mass index; (4) aetiology; (5) single surgeon.
CA, conventional arthroplasty; NS, not specified; RA, robotic-assisted arthroplasty; RCT, randomised clinical trial.