caa a22 4500 605457166 CHVBK 20210128100221.0 cr unu---uuuuu 210128e20150701xx s 000 0 eng 10.1007/s00167-014-2870-3 doi (NATIONALLICENCE)springer-10.1007/s00167-014-2870-3 A novel evaluation system to monitor bone formation and β-tricalcium phosphate resorption in opening wedge high tibial osteotomy [Elektronische Daten] [T. Tanaka, Y. Kumagae, M. Chazono, S. Kitasato, A. Kakuta, K. Marumo] Purpose: The aim of this study was to establish an evaluation system to monitor bone formation and beta-tricalcium phosphate (TCP) resorption in opening high tibial osteotomy (HTO). Methods: From 2003 to 2005, opening HTO was performed in 36 patients using a Puddu plate and β-TCP blocks with 60 and 75% porosity. Thirty-one patients were used for evaluation. All patients underwent CT examination at 2weeks and 6years. The CT image data were divided into three areas, and CT values of each area were analysed using the imaging software, Osirix. Results: CT image analysis at 2weeks showed that the mean CT-attenuation values (in Hounsfield units) of the implanted area with β-TCP of 60% porosity, the implanted area with β-TCP of 75% porosity, and cancellous bone were, 1,694.0±94.2, 1,010.9±81.1, and 178.0±45.1, respectively. Six years after surgery, these values were 574.1±273.5, 168.8±75.1, and 174.9±69.3, respectively. Conclusion: β-TCP with 75% porosity was completely resorbed and replaced by bone. β-TCP with 60% porosity was resorbed, but approximately 1/3 still remained even 6years after surgery. The imaging software, Osirix, enabled scanning of the whole area to measure CT values. This system is the first to quantitatively evaluate β-TCP resorption and bone formation in opening HTO. Level of evidence: Laboratory studies. The Author(s), 2014 β-TCP nationallicence Opening wedge HTO nationallicence Osirix nationallicence Bone formation nationallicence Tanaka T. Department of Orthopaedic Surgery, NHO Utsunomiya National Hospital, 2160 Shimo-Okamoto, 329-1193, Utsunomiya, Tochigi, Japan aut Kumagae Y. Department of Orthopaedic Surgery, NHO Utsunomiya National Hospital, 2160 Shimo-Okamoto, 329-1193, Utsunomiya, Tochigi, Japan aut Chazono M. Department of Orthopaedic Surgery, NHO Utsunomiya National Hospital, 2160 Shimo-Okamoto, 329-1193, Utsunomiya, Tochigi, Japan aut Kitasato S. Department of Orthopaedic Surgery, Jikei University School of Medicine, 105-8461, Tokyo, Japan aut Kakuta A. Department of Orthopaedic Surgery, Jikei University School of Medicine, 105-8461, Tokyo, Japan aut Marumo K. Department of Orthopaedic Surgery, Jikei University School of Medicine, 105-8461, Tokyo, Japan aut Knee Surgery, Sports Traumatology, Arthroscopy Springer Berlin Heidelberg 23/7(2015-07-01), 2007-2011 0942-2056 23:7<2007 2015 23 167 https://doi.org/10.1007/s00167-014-2870-3 text/html Onlinezugriff via DOI BK010053 XK010053 XK010000 Metadata rights reserved Springer special CC-BY-NC licence nationallicence 1 research-article jats NATIONALLICENCE NATIONALLICENCE NL-springer NATIONALLICENCE 856 40 https://doi.org/10.1007/s00167-014-2870-3 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Tanaka T. Department of Orthopaedic Surgery, NHO Utsunomiya National Hospital, 2160 Shimo-Okamoto, 329-1193, Utsunomiya, Tochigi, Japan aut NATIONALLICENCE 700 1- Kumagae Y. Department of Orthopaedic Surgery, NHO Utsunomiya National Hospital, 2160 Shimo-Okamoto, 329-1193, Utsunomiya, Tochigi, Japan aut NATIONALLICENCE 700 1- Chazono M. Department of Orthopaedic Surgery, NHO Utsunomiya National Hospital, 2160 Shimo-Okamoto, 329-1193, Utsunomiya, Tochigi, Japan aut NATIONALLICENCE 700 1- Kitasato S. Department of Orthopaedic Surgery, Jikei University School of Medicine, 105-8461, Tokyo, Japan aut NATIONALLICENCE 700 1- Kakuta A. Department of Orthopaedic Surgery, Jikei University School of Medicine, 105-8461, Tokyo, Japan aut NATIONALLICENCE 700 1- Marumo K. Department of Orthopaedic Surgery, Jikei University School of Medicine, 105-8461, Tokyo, Japan aut NATIONALLICENCE 773 0- Knee Surgery, Sports Traumatology, Arthroscopy Springer Berlin Heidelberg 23/7(2015-07-01), 2007-2011 0942-2056 23:7<2007 2015 23 167