TY - JOUR
T1 - Mid-term results of a new femoral prosthesis using Ti-Nb-Sn alloy with low Young’s modulus
AU - Chiba, Daisuke
AU - Yamada, Norikazu
AU - Mori, Yu
AU - Oyama, Masamizu
AU - Ohtsu, Susumu
AU - Kuwahara, Yoshiyuki
AU - Baba, Kazuyoshi
AU - Tanaka, Hidetatsu
AU - Aizawa, Toshimi
AU - Hanada, Shuji
AU - Itoi, Eiji
N1 - Funding Information:
The study was funded by Mizuho Co and Japan Hip Joint Foundation.
Publisher Copyright:
© 2021, The Author(s).
PY - 2021/12
Y1 - 2021/12
N2 - 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.
AB - 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.
KW - Low Young’s modulus
KW - Stress shielding
KW - Ti-Nb-Sn alloy; β type titanium alloy
KW - Total hip Arthroplasty
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U2 - 10.1186/s12891-021-04879-1
DO - 10.1186/s12891-021-04879-1
M3 - Article
C2 - 34836525
AN - SCOPUS:85119998149
VL - 22
JO - BMC Musculoskeletal Disorders
JF - BMC Musculoskeletal Disorders
SN - 1471-2474
IS - 1
M1 - 987
ER -