Comparison of stainless steel and titanium alloy instruments in posterior correction and fusion surgery for adolescent idiopathic scoliosis-prospective cohort study with minimum 2-year follow-up

Eijiro Okada, Koota Watanabe, Naobumi Hosogane, Yuta Shiono, Yohei Takahashi, Yuji Nishiwaki, Kazuhiro Chiba, Yoshiaki Toyama, Morio Matsumoto

Research output: Contribution to journalArticle

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Abstract

This prospective study compares the radiographic and clinical results of posterior correction and fusion surgery for adolescent idiopathic scoliosis (AIS) using stainless steel and titanium alloy instruments. The subjects consisted of 65 AIS patients who underwent posterior correction and fusion surgeries using a 5.5-mm-diameter rod at a single institution. Of these, 27 patients were treated using stainless steel instruments (S group) and 38 were treated using titanium alloy instruments (T group). The mean age at the time of surgery was 14.4 ± 3.5 years. The radiographic findings, intra-operative time, estimated blood loss, perioperative complications, and SRS-22 (a patient questionnaire used in the clinical evaluation of idiopathic scoliosis outcomes) were examined. The mean preoperative Cobb angle of the major curve was 62.5 ± 17.2° in the S group and 57.8 ± 13.2° in the T group (p = 0.407). Postoperatively, the curves were corrected to 11.2 ± 10.5° and 10.3 ± 8.5° (p = 0.384), with mean correction rates of 83.4 ± 12.2% and 83.1 ± 11.6% (p = 0.940), respectively. At the final follow-up, although the mean correction loss was slightly larger in the S group (4.4 ± 5.2°) compared with that in the T group (2.3 ± 5.5°), the values were not significantly different (p = 0.118). The coronal balance and sagittal balance were also not significantly different between the two groups at the final follow-up. The function, pain, and mental health sub-scores and the total score for SRS-22 show a tendency for better outcomes in the T group; however, there were no significant differences between the two groups. Thus, there was no statistical difference in radiographical and clinical outcomes between AIS patients treated surgically using stainless steel instruments and those treated using titanium alloy instruments.

Original languageEnglish
Pages (from-to)325-330
Number of pages6
JournalJournal of Medical and Biological Engineering
Volume33
Issue number3
DOIs
Publication statusPublished - 2013

Fingerprint

Stainless Steel
Scoliosis
Alloy steel
Titanium
Titanium alloys
Surgery
Cohort Studies
Fusion reactions
Stainless steel
Prospective Studies
Operative Time
Mental Health
Pain
Blood
Health

Keywords

  • Adolescent idiopathic scoliosis
  • Material
  • Spinal instrumentation
  • Stainless steel
  • Surgical treatment
  • Titanium alloy

ASJC Scopus subject areas

  • Biomedical Engineering
  • Medicine(all)

Cite this

Comparison of stainless steel and titanium alloy instruments in posterior correction and fusion surgery for adolescent idiopathic scoliosis-prospective cohort study with minimum 2-year follow-up. / Okada, Eijiro; Watanabe, Koota; Hosogane, Naobumi; Shiono, Yuta; Takahashi, Yohei; Nishiwaki, Yuji; Chiba, Kazuhiro; Toyama, Yoshiaki; Matsumoto, Morio.

In: Journal of Medical and Biological Engineering, Vol. 33, No. 3, 2013, p. 325-330.

Research output: Contribution to journalArticle

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abstract = "This prospective study compares the radiographic and clinical results of posterior correction and fusion surgery for adolescent idiopathic scoliosis (AIS) using stainless steel and titanium alloy instruments. The subjects consisted of 65 AIS patients who underwent posterior correction and fusion surgeries using a 5.5-mm-diameter rod at a single institution. Of these, 27 patients were treated using stainless steel instruments (S group) and 38 were treated using titanium alloy instruments (T group). The mean age at the time of surgery was 14.4 ± 3.5 years. The radiographic findings, intra-operative time, estimated blood loss, perioperative complications, and SRS-22 (a patient questionnaire used in the clinical evaluation of idiopathic scoliosis outcomes) were examined. The mean preoperative Cobb angle of the major curve was 62.5 ± 17.2° in the S group and 57.8 ± 13.2° in the T group (p = 0.407). Postoperatively, the curves were corrected to 11.2 ± 10.5° and 10.3 ± 8.5° (p = 0.384), with mean correction rates of 83.4 ± 12.2{\%} and 83.1 ± 11.6{\%} (p = 0.940), respectively. At the final follow-up, although the mean correction loss was slightly larger in the S group (4.4 ± 5.2°) compared with that in the T group (2.3 ± 5.5°), the values were not significantly different (p = 0.118). The coronal balance and sagittal balance were also not significantly different between the two groups at the final follow-up. The function, pain, and mental health sub-scores and the total score for SRS-22 show a tendency for better outcomes in the T group; however, there were no significant differences between the two groups. Thus, there was no statistical difference in radiographical and clinical outcomes between AIS patients treated surgically using stainless steel instruments and those treated using titanium alloy instruments.",
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AU - Shiono, Yuta

AU - Takahashi, Yohei

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