Comparison of cross-sectional area and fat infiltration of suboccipital muscles between normal dogs and dogs with atlantoaxial instability

Table 2 Ratio of spinal cord, CSA ratio and fat ratio of SOMs in normal and AAI dogs

Group		Ratio of spinal cord		CSA ratio of SOMs		Fat ratio of SOMs
Normal		0.44 ± 0.04^a		1.55 ± 0.23^b		0.30 ± 0.05^c
AAI	A	0.3 ± 0.1	0.31 ± 0.12	1.29 ± 0.33	1.28 ± 0.38	0.35 ± 0.06^d	0.37 ± 0.05
AAI	B	0.3 ± 0.1	0.32 ± 0.93	1.29 ± 0.33	1.29 ± 0.29	0.35 ± 0.06^d	0.33 ± 0.06

Data are expressed as the mean ± standard deviation. ^aSignificant difference in ratio of spinal cord to canal between normal and AAI dogs (P = 0.001). ^bSignificant difference in the ratio of CSA of SOMs to atlas between normal and AAI dogs (P = 0.029). ^cSignificant difference in the ratio of the intensity of SOMs to fat between normal and AAI dogs (P = 0.044). ^dSignificant difference in the ratio of the intensity of SOMs to fat between group A and B of AAI dogs (P = 0.035)

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