Fig. 1
From: Strategies for managing the destruction of calcar femorale
a The spur type of the calcar femorale can be seen in cross-sectional computed tomography images (red arrow) b The calcar femorale has a low signal in T1 weighted magnetic resonance images (red arrow) c The Adams arch (red arrow) is often confused with the calcar femorale. These three cross-sectional computed tomography images are from different individuals, the calcar femorale is classified into three types according to its length and thickness. d ridge-type: the calcar femorale is short and thick. e spur-type: the calcar femorale is longer than ridge-type and like a spur. f septum-type: the calcar femorale is thin and long