Table 3. Recent studies of single / two-stage revision outcome for knee PJI.

PJI: prosthetic joint infection, Single: single stage revision, Two-stage: two-stage revision, KSS: Knee Society Score, ROM: range of motion, NR: not reported, A: articulating spacer, S: static spacer, FWB: full-weight bearing, PWB: partial-weight bearing, NWB: non-weight bearing

Study	Year	Number of knees	Age (years)	Follow-up (years)	Single/ Two-stage	Spacer (Articulating / Static)	Weight-bearing	Awaiting time for revision	KSS	Knee Society Function score	flex ROM (degree)	Mechanical Complication (%)	Infection (%)
Shen et al. [3]	2010	10	68.9	2.5	Two	A	PWB	7.8 months	83.6	75.5	96.7	2 (20%)	0%
Westrich et al. [9]	2010	75	72	4.4	Two	A	NWB	3.8 months	90.1	90	NR	NR	9.30%
Tian et al. [10]	2018	25	64.9	5.4	Two	A	NWB	11.5 weeks	83	78	94	5 (20%)	0
Van Thiel et al. [11]	2011	60	66	2.9	Two	A	39 (65%); PWB, 16 (26%); FWB 5 (8.3%); NWB	75 days	78.6	NR	101.3	1 (1.7%)	7 (12%)
Tsai et al. [12]	2019	32	70.4	3.1	Two	A	PWB	8.8 months	NR	NR	102	2 (6.3%)	4 (12.5%)
Emerson et al. [17]	2002	22 26	65.1 65.7	3.8 7.5	Two	A S	PWB	6 to 12 weeks	NR	NR	107.8 93.7	1 (3.8%)	2 (9.0%) 2 (7.6%)
Bauer et al. [18]	2006	30 77	71.8 68.3	4.5 4.5	Single Two	- Both	NR	NR	75.5 74.8	62.5 62.5	92.5 93	NR	33% 33%
Haddad et al. [19]	2015	28 74	63 68	2	Single Two	- A	- PWB	- 62days	88 76	NR	NR	NR	0 5 (7%)
Lichstein et al. [20]	2016	109	67	3.7	Two	S	NR	≧6 weeks	86	85	100	NR	6%
Current study	−	16	73.1	2.4	Two	A	FWB	92.7 days	86.4	73.6	110.1	1 (6.4%)	2 (12.5%)