Table 2.

Baseline characteristics of the 9 reviewed manuscripts

author, year		eligible knees, N	knees lost to follow-up, N	included patients, N	TKA, N	women, %	OA,%	time bought by HTO†, years	age at TKA†, years	follow-up†, years	patients with missing data, N
Van Raaij, 2007 [11]	HTO	18	4	12	14	83	100	4.8	60	3.7	0
	control	342	-	12	14	83	100	NA	61	4.0	0
Haslam, 2007 [4]	HTO	78	27	40	51	48	100	4.8	65	12.6	0
	control	-	-	44	51	48	100	NA	65	12.6	0
Huang, 2002 [16]	HTO	-	-	15	17	87	100	8	61	5	0
	control	-	-	14	17	86	100	NA	62	5	0
Karabatsos, 2002 [17]	HTO	-	-	20	22	50	95	8.4	59	5.2	3
	control	-	-	20	21	50	95	NA	60	4.7	3
Meding, 2000 [18]a	HTO	39	-	39	39	31	97	8.7	67	7.5	0
	control	39	-	39	39	31	97	NA	67	6.8	0
Haddad, 2000 [19]	HTO	50	0	42	50	62	100	7.3	65	6.2	2
	control	-	-	42	50	57	100	NA	66	-	1
Nizard, 1998 [20]	HTO	63	6	55	63	85	100	9.7	72	4.5	5
	control	537	-	-	63	78	100	NA	71	4.0	-
Amendola, 1998 [21]	HTO	42	-	39	42	36	100	5.4	64	3.1	-
	control	168	-	39	41	49	100	NA	65	3.1	-
Mont, 1994 [22]	HTO	80	7	73	73	49	89	5	62	6.1	0
	control I b	974	-	73	73	49	89	NA	64	6.0	0
	control II c	974	-	73	73	49	88	NA	64	6.2	0

NA = not applicable

- = not mentioned in manuscript

† = the values are given as the average

^a = patient group received bilateral TKA after unilateral HTO and served as own control

^b = matched for pre-TKA deformity (within 5°)

^c = matched for pre-HTO deformity (only varus knees)