Biomechanics Study about the Half-pin on Posterior Malleolar when Trimalleolar Fracture is Treated by External Fixation in Dorsiflexion Position
CHENG Yong-zhong
WEN Jian-min
HONG Jun
CHANG De-you
SANG Zhi-cheng
WANG Lin-xia
WANG Lei
YAN An
ZHANG Kuan
Abstract：Objective: To find out stable position of posterior malleolar fracture when trimalleolar fractures were treated by external fixation in dorsiflexion position. Methods: Making cadaver model of trimalleolar fractures by operation. External fixation was installed and six half needles were used for fixation. Stick straining flake on very nether surface of half needle of posterior malleolus. Then straining flake was connected with leads of strain gauge. Ankle joint position was adjusted in three different positions. They were dorsiflexion-neutral position, dorsiflexion-varus position, dorsiflexion-ecstrophy position. Numerical data was gathered by deformeter when experimentation machine loaded. Results: Posterior malleolar fracture was more stable in dorsiflexion-neutral position than in dorsiflexion-varus position or dorsiflexion-ecstrophy position. Conclusions: Stable position of posterior malleolar fracture when trimalleolar fractures are treated by external fixation is dorsiflexion-neutral position.
Keywords：external fixationmalleolar injurebiomechanicsbiomedical study
Publication Date：2009-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：3( 764-765,777 )