Obesity is a risk factor for most orthopaedic conditions, including fractures. Previous studies have concluded that obese patients often have dysfunctional metabolism of internal circulating hormones and cytokines, and that these dysfunctions ultimately increase fracture risk by affecting the mineralization of bone tissue and influence the fracture healing process. It has been suggested that in obese children, the increased body weight leads to increased loading of the lower extremities and a corresponding enhancement of the skeletal mass of the lower extremities, but the upper extremity bones are susceptible to fracture because they are not weight-bearing and their mineralization is diminished. However, the fact is that obesity has a multifaceted effect on the function of various organs throughout the body, and the effect of obesity on fractures, especially the healing of fractures in children, is still unclear. Recently, orthopedic scholars from Johns Hopkins University School of Medicine in the United States conducted a retrospective study to analyze the effects of obesity related to children after fractures, with a view to clarifying the following doubts: 1. Whether the obesity status of pediatric patients can affect fracture healing 2. if children have a longer time to return to normal activities, is it related to the level of violence at the time of fracture? 3. do obese children have a higher rate of combined upper extremity fractures? The study population was derived from patients seen for fractures at Johns Hopkins Hospital between January 2010 and October 2011, aged 2-16 years. 273 patients met the study inclusion criteria (non-pathological long bone fractures, no loss to follow-up at the end of final follow-up), and all study data were obtained from medical records. The children were graded according to the degree of overweight: obese (61 patients, 23%), overweight (38 patients, 14%), normal weight (154 patients, 57%), and wasted (17 patients, 6%); the degree of violence in which the fracture occurred was graded: high-energy injuries, such as motor vehicle accidents, gunshot wounds, falls above 10feet; medium-energy injuries, sports injuries, etc.; and low-energy injuries, falls on flat roads The low energy and moderate energy injuries are classified as Low and moderate energy injuries are grouped together because they are less severe soft tissue injuries. Data from the study showed that the time to return to normal activity was 39 days in the overweight/obese group, which was less than 42 days in the normal weight group; obese children suffered a greater proportion of fractures with mild or moderate levels of injury violence than normal weight children, but no differences were found in the time to return to activity when comparing groups by injury type; and the proportion of upper extremity injuries in obese/overweight patients was similar to that in the normal weight group. As shown in Tables 1, 2, 3, and 4. Table 1: Comparison of different fracture sites and levels of violence graded by obesity/overweight and normal weight Table 2: Comparison of different fracture sites and levels of violence graded by BMI>85% and BMI<85 Table 3: Comparison of time to return to normal activity grouped by different types of violence graded by obesity/overweight and normal weight Table 4: Comparison of different levels of violence graded by BMI>85% and BMI<85 According to the above findings, the researchers concluded that obesity does not affect the time to return to normal activity after fracture in children; there is no significant difference in the incidence of upper and lower extremity fractures between obese and normal weight children; and the different types of violence factors do not have a significant effect on the time to return to functional movement in children after surgery. However, since the time to return to normal activity depends on multiple factors, whether obesity ultimately affects fracture healing needs to be confirmed by more studies in the long term.