The medial tangent of the proximal tibia is a suitable extra-articular landmark in determining the tibial anteroposterior axis

Table 1 Measurement of the medial tangent angle of the tibia and reliability calculated with intraclass correlation coefficients

	Level	Median	interquartile range	Inter-rater reliability	Intra-rater reliability
Whole (n = 103)	A	45.2^{***, †††}	43.0–47.7	0.974	0.982
	B	42.7^***	38.7–45.9	0.411	0.810
	C	42.4^†††	38.2–45.9	0.811	0.940

A, the level of the distal edge of the tibial tubercle; B, the level at 5 cm distal to A; C, the level at 10 cm further distally
Data are presented as degrees, intraclass correlation coefficients
An asterisk indicates significant difference between the values at A and B. ^***P < 0.001. A dagger indicates significant difference between the values at A and C. ^†††P < 0.001

ISSN: 1471-2474