Ceratopsia is among the most extensively studied groups of dinosaurs. However, research on ceratopsian osteohistology remains extremely limited, leaving significant gaps in our understanding of their growth rates, growth patterns, and life histories. This study presents a detailed histological analysis of the fibulae and ribs from two Liaoceratops yanzigouensis specimens (IVPP V18616 and V17910). V18616 was identified as a juvenile, estimated to be less than one year old, while V17910 was classified as a subadult, at least three years of age. The results indicate that Liaoceratops experienced rapid growth during its juvenile stage, with fibrolamellar bone dominating the cortical bone. By the subadult stage, the growth rate had gradually slowed. This study also highlights the importance of standardized sampling protocols, as evidenced by the rib sections. The feasibility of conducting comparative studies is constrained by the non-standardized sampling locations. The presence of LAGs (Lines of Arrested Growth) in V17910 suggests that Liaoceratops had a cyclical, interrupted growth pattern. In contrast to the continuous growth seen in chasmosaurinae, early-diverging neoceratopsians may have predominantly experienced cyclic growth interruptions.

角龙类是研究最为广泛的恐龙类群之一。然而，对早期角龙类骨组织学的研究仍然有限，这使得我们对其生长速度、生长模式和生活史的了解仍然较少。对两具辽角龙标本(IVPP V18616 V17910)的腓骨和肋骨进行了详细的骨组织学分析。V18616被鉴定为不到一岁的幼年个体，而V17910被鉴定为至少三岁的亚成年个体。研究表明，辽角龙在幼年期经历了快速生长，纤维板层骨占据了皮质骨的主要部分。到了亚成年阶段，其生长速度则逐渐放缓。此外，还强调了标准化采样的重要性。例如肋骨切片由于采样位置不标准而导致比较研究受到限制。V17910中出现的LAGs (生长停滞线)表明，辽角龙具有周期性间断的生长模式。这说明与角龙科连续不间断的生长模式不同，早期分异的新角龙类的生长模式可能仍以周期性间断的生长模式为主。