Fig. 2
From: Effect of ligating dogs’ arteries and veins on femoral heads
A The density in the femoral head was symmetric, without obvious cysts (before operation, dogs in Group A). B The density in the femoral head was equal, and the femoral head was smooth (before operation, dogs in Group B). C The femoral head was smooth, and a few cystic changes were visible (at 12 weeks, dogs in Group A). D The density of the femoral head was asymmetric, and there were partial sclerosis zones (at 12 weeks, dogs in Group B)