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Correlation between Anterior and Posterior Obliquity of the Sliding Lag Screw and Stability in Unstable Intertrochanteric Fractures
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Kyu Hyun Yang, Je Hyun Yoo, Dong Joo Rhee, Jung Hoon Won, Dae Ya Kim, Dong Sik Sim
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J Korean Fract Soc 2004;17(4):308-313. Published online October 31, 2004
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DOI: https://doi.org/10.12671/jkfs.2004.17.4.308
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 Abstract
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- PURPOSE
To investigate the characteristics of the sliding pattern of the proximal fragment (head and neck) in unstable intertrochanteric fractures, which were fixed with a dynamic hip screw (DHS) with anterior to posterior or posterior to anterior insertion angle in the axial view.
MATERIALS AND METHODS
AO type A2.1 intertrochanteric fracture was reproduced in 10 proximal femur model (Synbone, Malans, Switzerland). Five fractured models were reduced and fixed using DHS with anterior to posterior insertion angle (group 1) and five models were fixed with posterior to anterior angle (group 2). Load of 500 N (30 cycles) was applied to the fracture fragment-plate complex using Instron 6022. Data on the distance of sliding and the angle of rotation of the proximal fragment were collected and analyzed.
RESULTS
No significant difference was noted statistically in the distance of sliding between the two groups (p=0.92). However, the mean angle of rotation was 13.4degrees and 8.0degrees in group 1 and 2, respectively and the difference was statistically significant (p=0.012). Anterior cortical fracture of distal fragment was noted in 3 cases of group 1. There was no fracture of the anterior cortex in group 2.
CONCLUSION
In unstable intertrochanteric fracture, the insertion angle of the lag screw in axial view does seem to play a role in the fate of bone-plate complex. Early eccentric contact of both fragments caused rotation of the proximal fragment in all cases and anterior cortical fracture of the distal fragment in 3 cases of group 1.
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Mechanical Properties of F Plate in Intraarticular Calcaneal Fractures
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Kyu Hyun Yang, Young Hee Park, Jung Hoon Won, Dae Ya Kim
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J Korean Fract Soc 2004;17(2):167-172. Published online April 30, 2004
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DOI: https://doi.org/10.12671/jkfs.2004.17.2.167
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Abstract
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- PURPOSE
We evaluated the mechanical properties of F plate fixation comparing with Y plate and a screw fixation for the intraarticular calcaneal fractures using synthetic bones.
MATERIALS AND METHODS
Using 12 synthetic calcaneal bones, newly designed F plate was compared with the Y-plate, most commonly used, regarding the change of Bohler angle and the displacement of the thalamic fragments of the calcaneus after axial compressive loading by Instron 6022.
RESULTS
Y plate fixation lost 8degrees of Bohler angle in average after axial compressive load and 2.6degrees in F plate fixation. Thalamic fragments were displaced 1.72 mm in average in Y plate fixation group and 0.73 mm in F plate fixation group.
CONCLUSION
F plate offered more firm fixation than Y plate in the intraarticular calcaneal fracture in the aspect of maintaining the Bohler angle and preventing displacement of the thalamic fragments of calcaneus against axial compressive loading.
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Citations
Citations to this article as recorded by  - The Effect of Temporary K-wire Fixation in the Plate Fixation for Displaced Intra-articular Calcaneal Fracture
Kiwon Young, Jin Su Kim, Jinseon Moon
Journal of Korean Foot and Ankle Society.2014; 18(3): 119. CrossRef - Treatment of Displaced Intra-articular Calcaneal Fractures Using a F-plate
Kyu Hyun Yang, Jae Bong Chung, Han Kook Yoon, Si Young Park, Hang Seob Yoon
Journal of the Korean Fracture Society.2007; 20(1): 1. CrossRef
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