Between different experimental groups at the same age: for 30 days of age, the relative expression of RANKL mRNA in leg cartilage tissue of CHF and BPs groups was lower than that of the NC group, and the CHF-L group was significantly higher than that of the BPs group (p < 0.05). The gene discussed is TNFSF11; the disease is Bartsocas-Papas syndrome 1.