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目的比较3种方法测量西藏小型猪胫骨髓腔形态的优缺点,探索其胫骨髓腔形态学特点。方法取30例小型猪胫骨,分别予X线、CT三维重建、实物标本测量髓腔长度、髓腔最狭窄点水平径线长度、髓腔弧度,行统计学比较。结果 (1)小型猪胫骨髓腔近段三角形,远段椭圆形,中间为过渡形态;髓腔全长:X线(11.75±0.58)cm,CT(11.58±0.55)cm,实物标本(11.70±0.65)cm,P=0.524;最狭窄点水平正位径线长度分别为(0.88±0.08)、(0.84±0.06)、(0.85±0.07)cm,P=0.032;髓腔弧度分别为(26.89±0.50)°、(26.06±0.49)°、(26.50±0.42)°,P=0.106。结论 (1)CT三维重建测量更接近实物标本测量,精确性高于X线,可作为一种新的测量方法;(2)西藏小型猪胫骨髓腔长度适中,形态与人相似,适于设计新型可控微动胫骨髓内钉。
Objective To compare the advantages and disadvantages of three methods to measure the shape of the medullary cavity of Tibetan miniature pig tibia and to explore its morphological characteristics of the medullary cavity of the tibia. Methods Thirty cases of miniature pig tibia were obtained and reconstructed by X-ray and CT respectively. The length of medullary cavity and the diameter of the medullary cavity at the narrowest point of the medullary cavity were measured by real specimens. RESULTS: The length of medullary cavity was (11.75 ± 0.58) cm, CT (11.58 ± 0.55) cm, and the thickness of the medullary cavity was 11.70 ± 0.65 cm and P = 0.524, respectively. The length of the orthostatic axis at the narrowest point was (0.88 ± 0.08), (0.84 ± 0.06) and (0.85 ± 0.07) cm, respectively 0.50) °, (26.06 ± 0.49) °, (26.50 ± 0.42) °, P = 0.106. Conclusions (1) CT three-dimensional reconstruction measurements closer to the physical specimen measurement, the accuracy is higher than the X-ray, which can be used as a new measurement method; (2) Tibetan miniature pig tibia medullary cavity length is moderate, similar in morphology and suitable for design New controllable fretting Tibia intramedullary nail.