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A comparative study of the effect of drilling depth on generation of compressive force by headless compression screws using conical and cylindrical type of drill bit

 Hyung-Sik Kim  ;  Ho-Jung Kang  ;  Yun-Rak Choi  ;  Won-Taek Oh  ;  Il-Hyun Koh 
 Journal of Orthopaedic Surgery and Research, Vol.14(1) : 5, 2019 
Journal Title
 Journal of Orthopaedic Surgery and Research 
Issue Date
Biomechanics ; Compression force ; Drill bit type ; Drilling depth ; Headless compression screw
BACKGROUND: This study was conducted to measure the effect of different drilling depths on compression forces generated by two commonly used headless compression screws using the two different types of drill bit, the Acutrak® mini (conical type drill bit) and the Synthes 3.0 HCS® (cylindrical type drill bit). METHODS: A load cell was placed between two Sawbone blocks, which were 12 mm and 40 mm in thickness, respectively. After placing the guide pin into the center of the block, the drilling depth of the Acutrak® mini and Synthes HCS® screws ranged from 16 to 28 mm and 22 to 28 mm, respectively. The 24-mm screws were inserted and the compression force was measured immediately and at 30 min post-insertion. RESULTS: The Acutrak® mini generated greater compression force compared to the Synthes 3.0 HCS® when drilled to a depth of less than 24 mm. The compression force of the Acutrak® mini showed a strong inverse correlation with the drilling depth. There was no significant inverse correlation observed between the compression force of the Synthes HCS® and the drilling depth. CONCLUSIONS: If the screw length and the drill depth are the same, the Synthes 3.0 HCS® (cylindrical type drill bit) is safer and easier to use as it has no change in the compression force even when over-drilling because the compression force of the two screws is similar. As for the Acutrak® mini (conical type drill bit), while it is technically demanding due to varying compression force according to the drill depth, it can be used in certain cases because it can give stronger compression force through under-drilling.
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Appears in Collections:
1. College of Medicine (의과대학) > Dept. of Orthopedic Surgery (정형외과학교실) > 1. Journal Papers
Yonsei Authors
강호정(Kang, Ho Jung) ORCID logo https://orcid.org/0000-0003-0273-1264
고일현(Koh, Il Hyun) ORCID logo https://orcid.org/0000-0001-9823-8516
김형식(Kim, Hyoung Sik)
오원택(Oh, Won Taek)
최윤락(Choi, Yun Rak)
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