Table 1.

Reference values for knee/tibio-femoral angle and intercondylar/intermalleolar distances for the study cohort

Age (months)	Tibio-femoral angle			ICD/IMD
	Mean	−2SD	+2SD	Mean	−2SD	+2SD
0	13.23	12.63	13.83	2.53	2.44	2.64
1–3	7.88	7.67	8.08	1.51	1.45	1.57
4–6	6.44	6.36	6.52	0.90	0.86	0.94
7–9	5.80	5.72	5.87	0.67	0.64	0.70
10–12	6.64	6.53	6.75	0.80	0.76	0.84
13–15	5.66	5.54	5.79	0.22	0.17	0.27
16–18	1.99	1.75	2.23	−0.59	−0.78	−0.41
19–21	−3.84	−4.14	−3.54	−1.16	−1.35	−0.96
22–24	−6.03	−6.36	−5.71	−1.65	−1.83	−1.47
25–27	−8.38	−8.70	−8.07	−1.85	−1.98	−1.73
28–30	−8.25	−8.49	−8.02	−1.82	−1.95	−1.70
31–33	−6.91	−7.13	−6.69	−1.64	−1.78	−1.49
34–36	−6.62	−6.83	−6.40	−1.69	−1.86	−1.52

ICD/IMD Intercondylar/intermalleoli distances, SD standard deviation