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Research Article

Change of the X-ray Beam Angle may Influence Ankle Image of Weight-bearing Anteroposterior View: Trial to Evaluate Ankle Joint on Standing Whole-leg Radiograph

Ryuhei Katsui1, Tadashi Fujii2*, Katsuya Ito3, Akira Taniguchi4 and Yasuhito Tanaka4
1Department of Orthopaedic Surgery, Heisei Memorial Hospital, Japan
2Nara Kashiba Center for Arthroplasty and Spine Surgery, Japan
3Department of Orthopaedic Surgery, Ishinkai Yao General Hospital, Japan
4Department of Orthopaedic Surgery, Nara Medical University Kaminaka 839, Kashiba, Nara 639-0265, Japan
*Corresponding Author : Tadashi Fujii
Nara Kashiba Center for Arthroplasty and Spine Surgery
Japan
Tel: +81-745-77-8101
Fax: +81-745-78-5090
E-mail: tadashipfujii@gmail.com
Received date: January 15, 2016; Accepted date: March 25, 2016; Published date: March 29, 2016
Citation: Katsui R, Fujii T, Ito K, Taniguchi A, Tanaka Y (2016) Change of the X-ray Beam Angle may Influence Ankle Image of Weight-bearing Anteroposterior View: Trial to Evaluate Ankle Joint on Standing Whole-leg Radiograph. Clin Res Foot Ankle 4:184. doi: 10.4172/2329-910X.1000184
Copyright: © 2015 Katsui R, et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

Abstract

Upon evaluating the ankle joint structures by using standing whole-leg anteroposterior (AP) radiographs, the angle at which the X-ray beam is projected to the ankle joint, may distort the image. The accuracy and validity of the measurement of the ankle joint structure was investigated using weight-bearing AP radiographs obtained at several angles of X-ray beam projection for the clinical availability.

Three weight-bearing AP view radiographs of each limb were acquired upon projecting the X-ray beam cranially, and at 0°, 5°, and 10° to the ankle joint. The tibial anterior surface angle (TAS angle), tibial medial malleolus angle (TMM angle), and tibial bimalleolus angle (TBM angle) were measured on each weight-bearing AP view of the ankle joint. The measurements of the TAS, TMM, and TBM angles were then statistically compared.

The TAS angle did not change as the projected angle increased. No significant differences were observed between the groups. The TMM angle decreased gradually as the projected angle increased. A significant difference was observed between 0° and 10°. The TBM angle increased gradually as the projected angle increased. A significant difference was observed in the TBM angle between 0° and 5° as well as between 0° and 10°.

The TAS angle, which indicates varus/valgus deformity of the ankle joint, can assessed with the projected angle of 10°.

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