KMID : 0361620190540020141
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Journal of the Korean Orthopaedic Association 2019 Volume.54 No. 2 p.141 ~ p.149
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Correction of Single Thoracic Adolescent Idiopathic Scoliosis Using Pedicle Screw Instrumentation: Comparison of Stainless Steel to Titanium Alloy Instruments
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Kim Sung-Soo
Lim Dong-Ju Kim Jung-Hoon Choi Byung-Wan Kim Hwi-Young Lee Jun-Seok
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Abstract
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Purpose: To compare the results of two different instruments made of stainless steel and titanium alloy for correction of single thoracic adolescent idiopathic scoliosis (AIS) using pedicle screw instrumentation.
Materials and Methods: A total of 141 patients with single thoracic AIS treated with pedicle screw instrumentation and selective thoracic fusion were retrospectively reviewed after a follow-up of 2 years. The patients had a main thoracic curve of 40¡Æ to 75¡Æ and were divided into two groups based on instrument materials; S group (stainless steel, n=90) and T group (titanium alloy, n=51). The diameter of the stainless steel rod used was 7.0 mm while that of the titanium alloy rod was 6.35 mm or 6.0 mm. Standing long-cassette radiographic measurements including various coronal and sagittal parameters for the preoperative, early postoperative and 2-year postoperative follow-up were analyzed. There were no significant differences in the preoperative curve characteristics between the two groups.
Results: In the S group, the preoperative main thoracic curve of 51.3¡Æ¡¾8.4¡Æ was improved to 19.0¡Æ¡¾7.6¡Æ (63.1% correction) and the lumbar curve of 32.3¡Æ¡¾8.4¡Æ spontaneously decreased to 12.7¡Æ¡¾8.2¡Æ (62.9% correction) at 2 years postoperatively. In the T group, the preoperative main thoracic curve of 49.5¡Æ¡¾8.4¡Æ and the lumbar curve of 30.3¡Æ¡¾8.9¡Æ was improved to 18.8¡Æ¡¾7.4¡Æ (62.2% correction) and 11.3¡Æ¡¾5.4¡Æ (63.3% correction), respectively. The corrections of coronal curves were not statistically different between the two groups (p>0.05). The thoracic kyphosis was changed from 16.8¡Æ¡¾8.5¡Æ to 24.3¡Æ¡¾6.1¡Æ in the S group and from 19.6¡Æ¡¾11.2¡Æ to 26.6¡Æ¡¾8.5¡Æ in the T group. There were no significant differences in the changes of sagittal curves, coronal and sagittal balances at the 2-year follow-up and the number of fused segments and used screws between the two groups (p>0.05).
Conclusion: When conducting surgery for single thoracic AIS using pedicles screw instrumentation, two different instruments made of stainless steel and titanium alloy showed similar corrections for coronal and sagittal curves.
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KEYWORD
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scoliosis, adolescent, pedicle screws, stainless steel, titanium
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