Effect Assessment of Traditional Chinese Medicine, Guilu Erxian Jiao, in Patients with Osteoporosis: A Case-control Study of the Chang Gung Memorial Hospital

Background: Osteoporosis is a chronic skeletal disease characterized by low bone mass and increased risk of fracture. In Taiwan, Guilu Erxian Jiao (GEJ) is the commonly used formula of Chinese herbal medicines for patients with osteoporosis. However, the effect of GEJ on subsequent fractures in the long term is unclear. This is the first long-term case-control study of the effects of GEJ on the rates of fracture in patients with osteoporosis. Methods: We collected data from January 1, 2000 to December 31, 2019 from the Chang Gung Research Database. We interpreted from the reports of DXA to confirm whether the patients met the criteria for osteoporosis (T score <=-2.5). Eighty-five patients were enrolled in the GEJ group. After two propensity score matchings, 425 patients were identified as the non-GEJ group. We assessed four outcomes to confirm the effects of GEJ in patients with osteoporosis, including the change in the T-score, new occurrences of fractures, cumulative rate of fracture, and how many doses of GEJ need to be administered to effectively reduce fractures Results: There was no significant difference in either the improvement in the T score or the 5-year overall fracture ( p = 0.335) between these two groups. At the fracture-prone sites, the fracture in lumbar vertebrae was less in the GEJ group ( p = 0.034). A total of 600 GEJ pills are required to effectively reduce the incidence of fractures (p value = 0.0039). Conclusions: Patients who take at least 600 GEJ pills would have a decreased fracture risk at fracture-prone sites.