Effect of lengthening along the anatomical axis of the femur and its clinical impact

Table 1 Changes in the anatomical mechanical angle after lengthening

Femur length (cm)	X	P	θ	Δθ
21	3	14	6.21	0.79
	6	28	5.58	1.42
	9	42	5.06	1.94
	12	57	4.64	2.36
	15	71	4.28	2.72
	18	85	3.97	3.03
28	3	10	6.38	0.62
	6	21	5.87	1.13
	9	32	5.44	1.56
	12	42	5.06	1.94
	15	53	4.73	2.27
	18	64	4.45	2.55
35	3	8	6.5	0.5
	6	17	6.07	0.93
	9	25	5.69	1.31
	12	34	5.36	1.64
	15	42	5.06	1.94
	18	51	4.8	2.2
40	3	7	6.56	0.44
	6	15	6.17	0.83
	9	22	5.83	1.17
	12	30	5.52	1.48
	15	37	5.25	1.75
	18	45	5	2
44	3	7	6.6	0.4
	6	13	6.24	0.76
	9	20	5.92	1.08
	12	27	5.63	1.37
	15	34	5.37	1.63
	18	41	5.13	1.87
47	3	6	6.62	0.38
	6	12	6.28	0.72
	9	19	5.98	1.02
	12	25	5.7	1.3
	15	32	5.45	1.55
	18	38	5.22	1.78

X: Distance lengthened (cm); P: Percentage lengthened distance of the original bone length (%), θ: Angle between mechanical and anatomical axes after lengthening (degree); Δθ: Change in the angle between mechanical and anatomical axes due to lengthening (degree).