Importance of computed tomography in posterior malleolar fractures: Added information to preoperative X-ray studies

Table 2 Interobserver reliability of posterior malleolus size measurements

	Examiner X	Examiner Y	Pearson’s	P value
X-ray measurement
Absolute size of the tibia	5.28 (± 0.83)	5.09 (± 0.82)	0.88	< 0.001
Absolute size of the PM	1.43 (± 0.75)	1.32 (± 0.69)	0.92	< 0.001
MP size (PMXR)a	21.15 (± 10.20)	20.46 (± 9.66)	0.93	< 0.001
Mean PM sizea	20.81 (± 9.70)		-	-
CT measurement
Absolute size of the tibia	3.23 (± 0.65)	3.13 (± 0.62)	0.95	< 0.001
Absolute size of the PM	0.97 (± 0.38)	0.88 (± 0.37)	0.89	< 0.001
PM size (SAGCT)	23.45 (± 9.51)	22.39 (± 9.96)	0.94	< 0.001
Mean PM size	22.92 (± 9.60)
Interobserver agreement
PM < 25% in X-ray images	56	58	0.88	< 0.001
PM ≥ 25% in X-ray imagesb	25	23
PM < 25% in CTb	51	56	0.76	< 0.001
PM ≥ 25% in CTb	30	25

^aPercentage.

^bCases (absolute frequency). CT: Computed tomography; PM: Posterior malleolus; PMXR: Profile X-ray images of the posterior malleolus; SAGCT: Sagittal computed tomography images of the posterior malleolus.