THE MORPHOLOGICAL MEASURE OF THE TIBIAL MEDULLARY CAVITY AND ITS SIGNIFICANCE

Tibiaisoneofthemostimportantbonesthatbearaheavyburden ,anditisthe partthatmostfracturewasmostlyhappenedinlong pipebones.Thetibiaandfibulafracturesareabout 13.7%intotalfracture .Weoftentreatthetibiafracturewithintramedullarynailfixation ,soitschoiceanddesignmustbebasedontheanatomiccharacteroftibialmedullarycavity .Butthemorphologicalinvestiga tionofChinesetibialmedullarycavitywassoless.Thisstudymeasuredandestablishedthemorpholog icalparametersofChinesetibialmedullarycavity ,andprovidedthemorph…

THE MORPHOLOGICAL MEASURE OF THE TIBIAL MEDULLARY CAVITY AND ITS SIGNIFICANCE

Objective To provide morphological reference for the designing of the intramedullary nail fixation which suitable for Chinese by investigating the morphological characteristics of tibial medullary cavity. Methods The morphological parameters of the 113 normal adult tibiale were measured on the X-ray photographs with the image analysis software. Results The total lengths of tibial medullary cavities were 299.49±11.03mm(male) and 274.60±6.77mm(female), and the lengths of the narrow part were 66.36±3.90mm(male) and 51.57±3.92mm(female). The end-points of narrow part were about 29.9mm(male) and 26.09mm(female)below the midpoints of medullary cavities. The radians of the longitudinal axes of medullary cavities were 2.53±1.27°(male) and 2.57±1.16°(female). The proximal opening K were 9.47±2.71(male) and 8.59±2.46(female). The distal opening K were 8.21±2.93(male)and 7.65±2.87(female). Conclusion The morphology of tibial medullary cavity, the characteristic variety of radian and the opening K were very important for designing the Chinese intramedullary nail fixation.