足部骨骼之畸形变异及各骨的相互关系

ABNORMALITIES AND VARIATIONS OF THE FOOT BONES TOGETHER WITH THEIRMUTUAL RELATIONS

1.作者共观察成年男性足部X线象160例。对足部骨骼之畸形变异进行了研究。2.足部额外骨并不少见,占35%,常见者有副舟骨、副腓骨、跖间骨及三角骨等。3.跖骨头下方之籽骨数目可以为0—8个。4.作者测量了第一、二跖骨间角、(足母)趾跖趾间角、Bohler氏角、舟骨粗隆突出距离,第一、二跖骨头差及跖骨干皮质厚度,并指出其相互关系及实用意义。

160 cases of x-ray films of male foot have been studied with a view to examine thesupernumerary foot bone,the number of sesamoid bone beneath the head of metatarsus,the correlation of certain foot bone and the cortical thickness of metatarsus.The supernumerary bone in the foot is quite large in number(35%),among which theaccessory scaphoid(14.4%),the accessory fibula(8.75%),the intermetatarsal bone(4.37%)and the os trigonum(2.5%)are most frequently found.Their number,position,shapeand dimensions are quite different.The sesamoid bone beneath the metatarsal head may be absent:occasionally it maybe fissured into two pieces.In one case,its maximum number reaches as many as eight.The study of the correlation of certain foot bone shows:(1)The mean value of the intermetatarsal angle betweenⅠandⅡmetatarsus isa approximately 10°(min.3--4,max.15°),left side 9.14°+2.4°,right side 9.75°±2.34°.(2)The mean value of the intermetatarso-digital angle of hallux is approximately18--19,(min.8--9°,max.30°),left side 19.35°±15.4°,right side 18.71°±4.9°.(3)The mean value of the Bohler’s angle is apporximately 30°,(min.12°,max.65°),left side 32.03°+12.9°,right side 37.21°±11.75°.(4)The mean value of the breadth of protruding scaphoid tuberosity is 0.6 cm,(min.0.1 cm,max.1.3 cm.).(5)The head of the first metatarsus is frequently lying proximal to the second.Their distance varies from 0.9 cm.to+0.5 cm.The cortex of the second metatarsus in the thickest,its medial side is thicker thanthe lateral side.The thickness ofⅠ,Ⅲ,ⅣandⅤmetatarsus decreases in order.The above mentioned findings are discussed anatomically.