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Biomechanical Comparison and Three-Dimensional Analysis of Cement Distribution Patterns for Different Pedicle Screw Designs

 Sahyun Sung  ;  Ji-Won Kwon  ;  Tae Hyun Park  ;  Soo-Bin Lee  ;  Seong-Hwan Moon  ;  Byung Ho Lee 
 BIOMED RESEARCH INTERNATIONAL, Vol.2022 : 8293524, 2022-10 
Journal Title
Issue Date
Biomechanical Phenomena ; Bone Cements / therapeutic use ; Bone and Bones ; Glass Ionomer Cements ; Humans ; Lumbar Vertebrae / surgery ; Osteoporosis* / surgery ; Pedicle Screws*
The purpose of this study to explore strategies for reducing cement leakage during cement-augmented pedicle screw fixation, we compared the cement distribution patterns and biomechanical strengths of different types of cement-augmented fenestrated screws and traditional cement-augmented techniques. We compared five screw groups in this study: (1) Cannulated screws (Cann); (2) distal one-hole screws (D1); (3) distal two-hole screws (D2); (4) middle two-hole screws (M2); and (5) traditional screws with a traditional cement injection technique (Trad). The screws were inserted into cancellous bone blocks using a controlled, adequate cement injection pressure (1.6-2.0 kg), and an appropriate cement viscosity. Center to screw tip distance, three-dimensional distribution, and pull-out strength for cement were compared between groups. The average distance between the cement center and the screw tip was highest in the M2 group, suggesting a higher risk of cement leakage into the spinal canal. The Trad group had the highest migration distance in the z-axis, also reflecting a higher risk of leakage into the spinal canal. The D1 group had the highest pull-out strength (253 ± 48.82 N and 797 ± 58.31 N) in bone blocks representing different degrees of osteoporosis, and the D2 group had the second highest pull-out strength in the severe osteoporosis model. Overall, D1 screws appeared to be the best option for optimizing biomechanical function and minimizing the risk of cement leakage into the spinal canal in patients with osteoporotic bone undergoing spinal surgery.
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1. College of Medicine (의과대학) > Dept. of Orthopedic Surgery (정형외과학교실) > 1. Journal Papers
Yonsei Authors
Kwon, Ji-Won(권지원) ORCID logo https://orcid.org/0000-0003-4880-5310
Moon, Seong Hwan(문성환)
Lee, Byung Ho(이병호) ORCID logo https://orcid.org/0000-0001-7235-4981
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