Table 6.

Classification of the medullary canal geometry (29, 30, 31).

Dorr classification	Canal Flare Index	Cortical Index ap	Radiographic features	Cement
Type A	>4.7	0.48 ± 0.01	Thick cortices ap + lat	Uncemented
Type B	3.0–4.7	0.39 ± 0.01	Thin cortices posterior	Uncemented
Type C	<3.0	0.30 ± 0.02	Very thin cortices posterior and medial	Cemented