Yildirim Yakup, Cabukoglu Cengiz, Erol Bülent, Esemenli Tanil
Acibadem Hospital, Bagdat Caddesi Plk., Bagdat Cad. 347/7-8, Erenkoy 81070, Istanbul, Turkey.
Foot Ankle Int. 2005 Mar;26(3):247-50. doi: 10.1177/107110070502600311.
Lateral displacement of the sesamoids of the first toe relative to the metatarsal head is a common finding in hallux valgus deformity. Several methods have been described for quantifying the amount of subluxation from anteroposterior radiographs but a tangential sesamoid radiograph has been determined to be the best view to evaluate sesamoid displacement.
We evaluated the sesamoid position at different angles of the first metatarsophalangeal (MTP) joint to determine the effect of first MTP joint dorsiflexion on sesamoid position when tangential sesamoid view radiographs are made. Sesamoid positions of 22 feet with hallux valgus were graded from the short axis computed tomography (CT) images obtained with the MTP joint in 0, 35, and 70 degrees of dorsiflexion.
Approximation of the sesamoids to reduction was apparent as dorsiflexion of the first MTP joint increased.
Different dorsiflexion degrees of the first MTP joint when tangential sesamoid radiographs are made modulate the position of the sesamoids and may lead to misclassification on grading.
在拇外翻畸形中，第一跖骨头籽骨相对于跖骨头的外侧移位是常见表现。已有多种方法用于通过前后位X线片量化籽骨半脱位的程度，但经确定，籽骨切线位X线片是评估籽骨移位的最佳视角。
我们评估了第一跖趾（MTP）关节在不同角度时籽骨的位置，以确定在拍摄籽骨切线位X线片时，第一MTP关节背屈对籽骨位置的影响。从22例拇外翻足的短轴计算机断层扫描（CT）图像中，对MTP关节处于0度、35度和70度背屈时的籽骨位置进行分级。
随着第一MTP关节背屈增加，籽骨趋于复位。
拍摄籽骨切线位X线片时，第一MTP关节不同的背屈程度会调节籽骨位置，并可能导致分级错误。
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