Malalignment and malposition of quadriceps-sparing approach in primary total knee arthroplasty: a systematic review and meta-analysis

Table 1 Characteristics of included studies

Study/year	Country	Total TKAs		Follow-up (months)	Prosthesis type		Matching^a
		QS	MP		QS	MP
Huang 2016	China	31	30	65	PS-F	PS-F	1, 2, 3, 4, 5, 6, 7
Qi 2016	China	30	28	74.8	PS-F	PS-F	1, 2, 3, 4, 7
Chiang 2012	Taiwan	38	37	24	PS-F	PS-F	1, 2, 3, 4, 5, 6
Yang 2010	Korea	25	25	24	PS	PS	1, 2, 3, 4, 6
Karpman 2009	USA	20	19	6	CR	CR	1, 2, 3, 4, 6
Shen 2007	China	26	33	17	PS-F	PS-F	1, 2, 3, 4, 6, 7
Huang 2007	Taiwan	32	35	24	PS-F	PS-F	1, 2, 4, 6, 7
King 2007	USA	100	45	1.5	63PS/37PS-F	35CR/15PS	1, 2, 3, 4, 7
Kim 2007	Korea	120	120	21.5	PS	PS	1, 2, 3, 4, 6
Chin 2007	Singapore	30	30	Unclear	PS	Depuy CS	1, 2, 3, 4
Tashiro 2007	Japan	24	25	14	PS-F	23PS/2PS-F	1, 2, 3, 4, 5, 6, 7
Chen 2006	USA	32	38	33	PS-F	PS-F	1, 2, 3, 4, 6, 7
Kim 2006	Korea	144	144	13.6	PS	PS	1, 2, 3, 4

QS quadriceps-sparing, MP medial parapatellar, PS-F NexGen Legacy posterior stabilized-Flex prosthesis, PS NexGen Legacy posterior stabilized prosthesis, CR NexGen posterior cruciate-retaining prosthesis, Depuy CS Depuy PFC Sigma fixed-bearing cruciate-substituting prosthesis
^aMatching: 1 sex, 2 age, 3 BMI, 4 follow-up, 5 preoperative VAS, 6 preoperative range of motion, 7 preoperative knee deformity

ISSN: 1749-799X