Limb length discrepancy after total knee arthroplasty: A systematic review and meta-analysis

Table 1 Methodological quality assessment of eligible studies using Newcastle–Ottawa scale

Ref.	Selection				Comparability	Outcome
	Representativeness of exposed cohort	Selection of nonexposed cohort	Ascertainment of exposure	Demonstration that outcome of interest was not present at start of study	Adjust for the most important risk factors	Adjust for other risk factors	Assessment of outcome	Follow-up length	Loss to follow-up rate	Total quality score
	Postoperative limb length	Preoperative limb length	TKA	Limb lengthening/LLD	Age, sex, BMI	Varus/valgus deformity, KL grade etc.	Limb length change	Any postoperative period	< 20%
Vaidya et al[11], 2010	+	+	+	+	-	-	+	+	+	7 (moderate risk)
Lang et al[12], 2012	+	+	+	+	+	+	+	+	+	9 (low risk)
Chang et al[13], 2013	+	+	+	+	+	+	+	+	+	9 (low risk)
Tipton et al[14], 2015	+	+	+	+	+	+	+	+	+	9 (low risk)
Kim et al[4], 2015	+	+	+	-	+	+	-	+	+	7 (moderate risk)
Goldstein et al[15], 2016	+	+	+	+	+	+	-	+	+	8 (moderate risk)
Chinnappa et al[16], 2017	+	+	+	+	+	+	+	+	+	9 (low risk)
Hinarejos et al[17], 2020	+	+	+	+	+	+	+	+	+	9 (low risk)

TKA: Total knee arthroplasty; LLD: Limb length discrepancy; BMI: Body mass index.