Poor accuracy of plain radiographic measurements of prosthetic migration and alignment in total ankle replacement

Table 1 Observed differences in anteroposterior measurements of experimental series

		tibia_vbx1	tibia_vbx2	tibia_vby	talus_vbx1	talus_vbx2	talus_vby
0°–20° internal rotation, 85° flexion	Max	11.42	23.32	20.25	27.41	8.39	16.44
	Min	10.79	10.64	18.85	21.60	3.41	16.13
	Max-min	0.63	12.68	1.41	5.81	4.97	0.32
	Mean	11.11	16.54	19.72	25.18	5.23	16.22
0°–20° internal rotation, 90° flexion	Max	11.62	24.31	25.11	28.18	9.87	18.74
	Min	10.92	11.29	23.71	20.84	4.04	18.04
	Max-min	0.70	13.02	1.40	7.34	5.83	0.70
	Mean	11.35	17.53	24.54	25.51	6.11	18.39
85°–90° flexion	Max	0.62	1.48	5.31	1.07	1.48	2.60
	Min	0.05	0.65	4.59	0.11	0.11	1.60
	Max-min	0.57	0.83	0.72	0.97	1.37	1.01
	Mean	0.30	0.99	4.82	0.52	0.88	2.17
0°–20° internal rotation, 85°–90° flexion	Max	11.62	24.31	25.11	28.18	9.87	18.74
	Min	10.79	10.64	18.85	20.84	3.41	16.13
	Max-min	0.82	13.67	6.26	7.34	6.46	2.61
	Mean	11.23	17.04	22.13	25.35	5.67	17.31

ISSN: 1749-799X