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Characteristics of pedicle screw misplacement using freehand technique in degenerative scoliosis surgery

  • Orthopaedic Surgery
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Abstract

Purpose

This study aimed to estimate the accuracy of pedicle screw (PS) placement in degenerative scoliosis surgery, characterize a patient population with PS misplacement, and analyze the association between misplaced PS vector and lumbar coronal curve.

Methods

In this study, 122 patients (average age 68.6 years), who underwent corrective and decompression surgery, were selected retrospectively. PS accuracy was evaluated in the thoracic to lumbar spine. We identified characteristics of misplacement in each patient. Screw positions were categorized into grade A, entirely in the pedicle; grade B, < 2 mm breach; grade C, 2–4 mm breach; and grade D, > 4 mm breach using postoperative computed tomography.

Results

The mean preoperative lumbar coronal curve was 32.3 ± 18.4°, and the number of fused vertebrae was 8.9 ± 2.8. A total of 2032 PS were categorized as follows: grade A, 1897 PS (93.3%); grade B, 67 (3.3%); grade C, 26 (1.3%); and grade D, 43 (2.1%). One PS (grade D), inserted at T5, needed surgery for removal due to neurological deficit. The misplacement group (grades C and D) had a significantly stronger lumbar coronal curve and apical vertebral rotation than the accuracy group (grades A and B). Misplaced PS vector (direction and degree) was significantly correlated with inserted vertebral rotation. Grade D misplacement was distributed mainly around the transitional vertebra of the lumbar curve.

Conclusions

The accuracy of PS insertion in the thoracic to lumbar spine was high in DS surgery, but the need for care was highlighted in the transitional vertebra.

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Funding

Funding sources of Yu Yamato and Shin Oe: Medtronic Sofamor Danek Inc., Japan Medical Dynamic Marketing Inc., and Meitoku Medical Institution Jyuzen Memorial Hospital.

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Authors

Contributions

TY wrote and prepared the manuscript, and all of the authors participated in the study design. All authors have read, reviewed, and approved the article.

Corresponding author

Correspondence to Tomohiro Yamada.

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Conflict of interest

Tomohiro Yamada, Tomohiko Hasegawa, Go Yoshida, Tatsuya Yasuda, Hideyuki Arima, Tomohiro Banno, Hiroki Ushirozako, Koichiro Ide, Yuh Watanabe, Keichi Nakai and Yukihiro Matsuyama have nothing to disclose. Yu Yamato and Shin Oe work at a donation-endowed laboratory in the Division of Geriatric Musculoskeletal Health.

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Yamada, T., Hasegawa, T., Yamato, Y. et al. Characteristics of pedicle screw misplacement using freehand technique in degenerative scoliosis surgery. Arch Orthop Trauma Surg 143, 1861–1867 (2023). https://doi.org/10.1007/s00402-022-04380-x

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  • DOI: https://doi.org/10.1007/s00402-022-04380-x

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