Relationship between Transverse Arch and Hindfoot in Normal Foot. Radiological Assessment by New Technique. : Radiological Assessment by New Technique

概要

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The purpose of this study was to evaluate the relationship between the transverse arch and hindfoot in normal foot by a new radiographic method. The subjects were 34 feet of 17 cases, consisting of 12 males and 5 females whose average age was 33 years (24-52 years). We used an original device which takes roentogenogram at 20 degrees of dorsiflexion of the MTP joints. In both leg standing position, the center of X-ray inserted from front to 2nd metatarsal axis and bottom level of device. We decided the bottom point of the 1st metatarsal head (A), 2nd metatarsal head (B), 5th metatarsal head (B), and axis line of the calcaneus on the roentogenogram. We measured the length of line AB and the distance from M to AB, and calculated the height of the 2nd metatarsal head as the transverse arch (H%). We measured the angle between the calcaneal axis and line AB too (θ°). The average of H was 4.54±1.69% (1.64-7.45%), and the average of θ was 96.5±4.48° (87.0-105.0°). Since we were able to evaluate the relationship between the transverse arch and hindfoot from one roentogenogram by our new method, it indicates that the technique is useful.