• Kazuhide Inage, Sumihisa Orita, Yawara Eguchi, Yasuhiro Shiga, Masao Koda, Yasuchika Aoki, Toshiaki Kotani, Tsutomu Akazawa, Takeo Furuya, Junichi Nakamura, Hiroshi Takahashi, Miyako Suzuki-Narita, Satoshi Maki, Shigeo Hagiwara, Masahiro Inoue, Masaki Norimoto, Hideyuki Kinoshita, Takashi Sato, Masashi Sato, Keigo Enomoto, Hiromitsu Takaoka, Norichika Mizuki, Takashi Hozumi, Ryuto Tsuchiya, Geundong Kim, Takuma Otagiri, Tomohito Mukaihata, Takahisa Hishiya, and Seiji Ohtori.
• Department of Orthopaedic Surgery, Graduate School of Medicine, Chiba University, Chiba, Japan. kazuhideinage@chiba-u.jp.
• Yonsei Med. J. 2021 Sep 1; 62 (9): 829-835.

PurposeIn this multicenter retrospective observational study, we examined the early effects of romosozumab in patients with severe osteoporosis in terms of time-course changes in bone metabolism marker, improvement in bone density, and adverse effects.Materials And MethodsPatients with severe osteoporosis were included. We investigated the progress of TRACP 5b and P1NP before and 1-2 months after the administration of romosozumab. We also investigated the bone density of lumbar spine, femoral neck, and the entire femur, measured by the DXA method, before and 5-7 months after the administration of romosozumab.ResultsA total of 70 patients (7 males and 63 females, age 75.0±3.6 years) participated in this study. Significant improvements in TRACP 5b and P1NP levels were observed before and 1-2 months after romosozumab administration. The average bone density of lumbar spine, femoral neck, and the entire femur were measured before and 5-7 months after romosozumab administration; and a significant increase only observed in the lumbar spine.ConclusionConsistent with the findings of previous clinical studies, romosozumab has both bone formation-enhancing and bone resorption effects (dual effect). In addition, romosozumab also demonstrated improvement in bone density from the early phase after the administration, though the result was only seen in the lumbar spine.© Copyright: Yonsei University College of Medicine 2021.

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