Chinese Journal of Tissue Engineering Research ›› 2020, Vol. 24 ›› Issue (36): 5850-5857.doi: 10.3969/j.issn.2095-4344.2914
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Li Chao, Cheng Jingbo, Feng Mingli
Received:
2020-03-01
Revised:
2020-03-10
Accepted:
2020-04-23
Online:
2020-12-28
Published:
2020-10-27
Contact:
Feng Mingli, MD, Chief physician, Department of Orthopedics, Xuanwu Hospital, Capital Medical University, Beijing 100053, China
About author:
Li Chao, Master candidate, Physician, Department of Orthopedics, Xuanwu Hospital, Capital Medical University, Beijing 100053, China
CLC Number:
Li Chao, Cheng Jingbo, Feng Mingli. Biomechanical study of the effect of femoral anatomy on knee arthroplasty[J]. Chinese Journal of Tissue Engineering Research, 2020, 24(36): 5850-5857.
2.1 股骨形态的概述 人类股骨形态呈圆弧状弯曲状[2],可分为股骨上段、中段和远端。股骨上段髓腔存在着2个弯曲,股骨髓腔上部弯曲是朝后,下部弯曲朝前的,这说明股骨上段具有一定的弧度。在股骨中段,股骨弓向前,股骨髓腔呈开口向后的弧形,所以整个髓腔形态从侧位片上呈“S”形[3],股骨中段弯曲主要通过侧弓角度体现[4-6]。股骨侧弓角的测量方法见图2。有研究发现人类股骨侧弓角的平均值为(4.88±1.24)°[7],但不同人种之间股骨侧弓角度并不相同。有研究发现非裔美国人股骨侧弓角较亚洲人和白种人小,并且认为人种间股骨侧弓角的差异是由于股骨长度所造成的[4]。有研究发现黑色人种的股骨曲率半径大于白色人种,说明黑色人种的股骨侧弓角度要大于白色人种[8];有研究对100例股骨进行了分析,得出股骨前弓半径的平均值为108 cm,且该值与性别、年龄无关[9]。有学者通过对426例股骨CT进行研究,得出股骨的前弓半径为(971.44±211.68)mm,且男性大于女性[5]。有研究出日本人股骨曲率半径在矢状面为175 mm,冠状面为2 640 mm[10]。有研究对中国人的股骨形态经行研究后得出中国人股骨的外侧轮廓就像一根曲棍球棒的形状并且股骨曲率半径大于日本人[11],见图3。中国北方地区人群中股骨侧弓的平均值为(1.4±2.4)°,股骨外翻角为(6.5±1.3)°[12]。 "
2.1 股骨形态的概述 人类股骨形态呈圆弧状弯曲状[2],可分为股骨上段、中段和远端。股骨上段髓腔存在着2个弯曲,股骨髓腔上部弯曲是朝后,下部弯曲朝前的,这说明股骨上段具有一定的弧度。在股骨中段,股骨弓向前,股骨髓腔呈开口向后的弧形,所以整个髓腔形态从侧位片上呈“S”形[3],股骨中段弯曲主要通过侧弓角度体现[4-6]。股骨侧弓角的测量方法见图2。有研究发现人类股骨侧弓角的平均值为(4.88±1.24)°[7],但不同人种之间股骨侧弓角度并不相同。有研究发现非裔美国人股骨侧弓角较亚洲人和白种人小,并且认为人种间股骨侧弓角的差异是由于股骨长度所造成的[4]。有研究发现黑色人种的股骨曲率半径大于白色人种,说明黑色人种的股骨侧弓角度要大于白色人种[8];有研究对100例股骨进行了分析,得出股骨前弓半径的平均值为108 cm,且该值与性别、年龄无关[9]。有学者通过对426例股骨CT进行研究,得出股骨的前弓半径为(971.44±211.68)mm,且男性大于女性[5]。有研究出日本人股骨曲率半径在矢状面为175 mm,冠状面为2 640 mm[10]。有研究对中国人的股骨形态经行研究后得出中国人股骨的外侧轮廓就像一根曲棍球棒的形状并且股骨曲率半径大于日本人[11],见图3。中国北方地区人群中股骨侧弓的平均值为(1.4±2.4)°,股骨外翻角为(6.5±1.3)°[12]。 "
膝关节单髁置换中股骨髓内定位杆插入点的选择依据牛津微创置换操作手册:股骨髓内定位杆插入点必须在股骨髁间窝前内缘的前方1 cm处,且紧贴股骨髁间窝内壁内侧,指向髂前上棘[46-47],见图4。这样可以保证术后下肢力线<0°,因为术后下肢力线内翻>5°则会加速聚乙烯衬垫的磨损; 而过度外翻将导致外侧软骨磨损[48-49];下肢力线内翻>8°就有可能导致假体脱位或松动,甚至需进行早期翻修。牛津微创置换操作手册并未对股骨形态的不同而选择不同股骨髓内定位杆插入点经行说明,这就导致术中需要手术医师依据经验进行选择[50]。有研究对股骨髓内定位杆的位置经行研究后发现冠状位上股骨髓内导杆与股骨髓腔解剖轴线呈外侧交角,平均角度为0.96°;在矢状位上呈后方交角,平均角度为0.13°[51]。MA等[52]对20具尸体经行研究后得出在冠状面时股骨解剖轴距股骨髁间窝中心3.7 mm。蔡骏丰等[47]基于单髁关节置换的尸体骨研究得出,中国人股骨平均外翻角约5.1°,最大7.78°,最小3.78°,并且该研究认为股骨髓内定位杆插入点的理想位置应在髁间窝最高点与髁间窝内侧缘中间距髁间窝水平线前方约1.46 cm的位置。 "
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