Morphometric analysis of posterior cranial fossa and foramen magnum and it’s clinical implications in craniovertebral junction malformations: a computed tomography based institutional study in a tertiary care hospital of northern part of India

Egyptian Journal of Neurosurgery

Table 3 Comparison of Linear Craniometric Parameters of Posterior Cranial Fossa for different age groups

Linear Craniometric Parameters of Posterior Cranial Fossa	18–30(n = 21) Mean ± SD	31–40(n = 3) Mean ± SD	41–50(n = 20) Mean ± SD	51–60(n = 27) Mean ± SD	61–70(n = 15) Mean ± SD	Total Mean ± SD	p value
Twinning line (mm){TwL}	97.25 ± 3.18	96.92 ± 3.11	98.04 ± 3.57	97.44 ± 3.45	96.68 ± 2.72	97.25 ± 3.21	0.715^a
McRae’s line (mm)	32.51 ± 2.33	32.08 ± 1.57	32.55 ± 1.74	32.26 ± 2	31.98 ± 1.68	32.26 ± 1.84	0.816^a
Clivus length (mm)	41.54 ± 2.6	41.31 ± 1.7	41.88 ± 1.73	41.74 ± 2.01	41.65 ± 2.2	41.59 ± 1.99	0.863^a
IOP-O line (mm)	43.37 ± 2.26	43.68 ± 2.15	44.21 ± 1.68	44.39 ± 2.03	43.89 ± 1.81	43.9 ± 2.03	0.432^a
Chamberlain line (mm)	75.09 ± 3.31	76.06 ± 3.4	75.38 ± 4	75.13 ± 4.19	75.62 ± 3.63	75.51 ± 3.66	0.839^a
Klaus’ index (mm)	44.77 ± 2.9	44.32 ± 1.79	44.49 ± 1.86	44.5 ± 2.68	45.13 ± 2.2	44.57 ± 2.27	0.818^a
Height of posterior fossa (mm){h}	34.39 ± 1.6	34.15 ± 1.47	34.42 ± 1.55	34.53 ± 1.47	34.56 ± 1.19	34.37 ± 1.46	0.846^a
Height of supratentorial region (mm){H}	90.77 ± 2.05	91.15 ± 1.81	91.35 ± 2.08	91.98 ± 1.96	90.67 ± 1.98	91.24 ± 1.97	0.173^a
h/TwL	0.35 ± 0.02	0.35 ± 0.01	0.35 ± 0.02	0.35 ± 0.02	0.36 ± 0.01	0.35 ± 0.02	0.815^a
Posterior fossa volume (cm³)	164.47 ± 7.39	161.93 ± 8.23	163.66 ± 5.89	162.96 ± 7.97	158.93 ± 7.51	162.52 ± 7.64	0.247^a