Mid-term results of a new femoral prosthesis using Ti-Nb-Sn alloy with low Young’s modulus

Abstract Background This study was performed to investigate the mid-term results of Ti-Nb-Sn (TNS) alloy stem with a low Young’s modulus. Methods This study was a multicenter prospective cohort study. A total of 40 primary total hip arthroplasties performed between April 2016 and September 2017 was...

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Autores principales:	Daisuke Chiba, Norikazu Yamada, Yu Mori, Masamizu Oyama, Susumu Ohtsu, Yoshiyuki Kuwahara, Kazuyoshi Baba, Hidetatsu Tanaka, Toshimi Aizawa, Shuji Hanada, Eiji Itoi
Formato:	article
Lenguaje:	EN
Publicado:	BMC 2021
Materias:	Total hip Arthroplasty Low Young’s modulus Stress shielding Ti-Nb-Sn alloy; β type titanium alloy Diseases of the musculoskeletal system RC925-935
Acceso en línea:	https://doaj.org/article/92be025326134f789c24cd96729688f5
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spelling	oai:doaj.org-article:92be025326134f789c24cd96729688f52021-11-28T12:24:24ZMid-term results of a new femoral prosthesis using Ti-Nb-Sn alloy with low Young’s modulus10.1186/s12891-021-04879-11471-2474https://doaj.org/article/92be025326134f789c24cd96729688f52021-11-01T00:00:00Zhttps://doi.org/10.1186/s12891-021-04879-1https://doaj.org/toc/1471-2474Abstract Background This study was performed to investigate the mid-term results of Ti-Nb-Sn (TNS) alloy stem with a low Young’s modulus. Methods This study was a multicenter prospective cohort study. A total of 40 primary total hip arthroplasties performed between April 2016 and September 2017 was enrolled in this study. With the unique functional gradient properties by heating treatment, the strength of the proximal portion was enhanced, while the distal portion maintained a low Young’s modulus. The surgeries were performed through the posterolateral approach using the TNS alloy stems. Radiographs were taken from immediately after surgeries until 3 years, and stress shielding and subsidence of the stems were evaluated. The incidences of the stem breakage were also assessed. Clinical assessments were performed using Japanese Orthopaedic Association (JOA) and Japanese Orthopaedic Association Hip Disease Evaluation Questionnaire (JHEQ) scores. Results Among the 40 enrolled patients, 36 patients were female and 4 were male. At 3 years after surgery, there were no radiologic signs of loosening, subsidence, or breakage of the stem. Stress shielding was observed in 26 hips (65%). Of 26 hips, 16 hips (40%) were grade 1 and 10 hips (25%) were grade 2. There was no advanced stress shielding. The JOA and JHEQ scores significantly improved compared with the preoperative scores. Conclusion The current study using a new TNS alloy femoral stem showed good clinical outcomes at 3-year follow-up. Radiologically, there was no loosening or subsidence of the stem. The mild stress shielding was observed in 65% of patients. Trial registration Current Controlled Trials ISRCTN21241251 . The date of registration was October 26, 2021. Retrospectively registered.Daisuke ChibaNorikazu YamadaYu MoriMasamizu OyamaSusumu OhtsuYoshiyuki KuwaharaKazuyoshi BabaHidetatsu TanakaToshimi AizawaShuji HanadaEiji ItoiBMCarticleTotal hip ArthroplastyLow Young’s modulusStress shieldingTi-Nb-Sn alloy; β type titanium alloyDiseases of the musculoskeletal systemRC925-935ENBMC Musculoskeletal Disorders, Vol 22, Iss 1, Pp 1-9 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Total hip Arthroplasty Low Young’s modulus Stress shielding Ti-Nb-Sn alloy; β type titanium alloy Diseases of the musculoskeletal system RC925-935
spellingShingle	Total hip Arthroplasty Low Young’s modulus Stress shielding Ti-Nb-Sn alloy; β type titanium alloy Diseases of the musculoskeletal system RC925-935 Daisuke Chiba Norikazu Yamada Yu Mori Masamizu Oyama Susumu Ohtsu Yoshiyuki Kuwahara Kazuyoshi Baba Hidetatsu Tanaka Toshimi Aizawa Shuji Hanada Eiji Itoi Mid-term results of a new femoral prosthesis using Ti-Nb-Sn alloy with low Young’s modulus
description	Abstract Background This study was performed to investigate the mid-term results of Ti-Nb-Sn (TNS) alloy stem with a low Young’s modulus. Methods This study was a multicenter prospective cohort study. A total of 40 primary total hip arthroplasties performed between April 2016 and September 2017 was enrolled in this study. With the unique functional gradient properties by heating treatment, the strength of the proximal portion was enhanced, while the distal portion maintained a low Young’s modulus. The surgeries were performed through the posterolateral approach using the TNS alloy stems. Radiographs were taken from immediately after surgeries until 3 years, and stress shielding and subsidence of the stems were evaluated. The incidences of the stem breakage were also assessed. Clinical assessments were performed using Japanese Orthopaedic Association (JOA) and Japanese Orthopaedic Association Hip Disease Evaluation Questionnaire (JHEQ) scores. Results Among the 40 enrolled patients, 36 patients were female and 4 were male. At 3 years after surgery, there were no radiologic signs of loosening, subsidence, or breakage of the stem. Stress shielding was observed in 26 hips (65%). Of 26 hips, 16 hips (40%) were grade 1 and 10 hips (25%) were grade 2. There was no advanced stress shielding. The JOA and JHEQ scores significantly improved compared with the preoperative scores. Conclusion The current study using a new TNS alloy femoral stem showed good clinical outcomes at 3-year follow-up. Radiologically, there was no loosening or subsidence of the stem. The mild stress shielding was observed in 65% of patients. Trial registration Current Controlled Trials ISRCTN21241251 . The date of registration was October 26, 2021. Retrospectively registered.
format	article
author	Daisuke Chiba Norikazu Yamada Yu Mori Masamizu Oyama Susumu Ohtsu Yoshiyuki Kuwahara Kazuyoshi Baba Hidetatsu Tanaka Toshimi Aizawa Shuji Hanada Eiji Itoi
author_facet	Daisuke Chiba Norikazu Yamada Yu Mori Masamizu Oyama Susumu Ohtsu Yoshiyuki Kuwahara Kazuyoshi Baba Hidetatsu Tanaka Toshimi Aizawa Shuji Hanada Eiji Itoi
author_sort	Daisuke Chiba
title	Mid-term results of a new femoral prosthesis using Ti-Nb-Sn alloy with low Young’s modulus
title_short	Mid-term results of a new femoral prosthesis using Ti-Nb-Sn alloy with low Young’s modulus
title_full	Mid-term results of a new femoral prosthesis using Ti-Nb-Sn alloy with low Young’s modulus
title_fullStr	Mid-term results of a new femoral prosthesis using Ti-Nb-Sn alloy with low Young’s modulus
title_full_unstemmed	Mid-term results of a new femoral prosthesis using Ti-Nb-Sn alloy with low Young’s modulus
title_sort	mid-term results of a new femoral prosthesis using ti-nb-sn alloy with low young’s modulus
publisher	BMC
publishDate	2021
url	https://doaj.org/article/92be025326134f789c24cd96729688f5
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Mid-term results of a new femoral prosthesis using Ti-Nb-Sn alloy with low Young’s modulus

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