title: Load response of the medial longitudinal arch in patients with flatfoot deformity: in vivo 3D study.
abstract: BACKGROUND
  The acquisition of flatfoot by an adult is thought to primarily be caused by posterior tibial tendon dysfunction, although some other causes, such as congenital flexible flatfoot or an accessory navicular, may also be responsible. The objective of this study was to evaluate the bone rotation of each joint in the medial longitudinal arch (MLA) and compare the response in healthy feet with that in flat feet by analyzing the reconstructive three-dimensional (3D) CT image data during weightbearing.
  
  
  METHODS
  CT scans of 20 healthy feet and 24 feet with flatfoot deformity were taken in non-load condition followed by full-body weightbearing condition. Images of the tibia and MLA bones (first metatarsal bone, cuneiforms, navicular, talus, and calcaneus) were reconstructed into 3D models. The volume merge method in three planes was used to calculate the bone-to-bone relative rotations.
  
  
  RESULTS
  Under loading conditions, the flatfoot dorsiflexed more in the first tarsometatarsal joint, and everted more in the talonavicular and talocalcaneal joints compared with the healthy foot. The total relative rotation was larger in the flatfoot compared with the healthy foot only in the first tarsometatarsal joint.
  
  
  CONCLUSIONS
  Supporting the MLA in the sagittal direction and the subtalar joint in the coronal direction may be useful for treating flatfoot deformity. The first tarsometatarsal joint may play an important role in diagnosing or treating flatfoot deformity.
authors: Department of Orthopaedics, Graduate School of Medical Science, Kyoto Prefectural University of Medicine, Japan.
authors: Masamitsu
authors: M
authors: Kido
authors: Kazuya
authors: K
authors: Ikoma
authors: Kan
authors: K
authors: Imai
authors: Daisaku
authors: D
authors: Tokunaga
authors: Nozomu
authors: N
authors: Inoue
authors: Toshikazu
authors: T
authors: Kubo
mesh_terms: D000328:Adult; D002111:Calcaneus / Q000000981:diagnostic imaging / Q000503:physiopathology; D005260:Female; D005413:Flatfoot / Q000000981:diagnostic imaging* / Q000209:etiology / Q000503:physiopathology*; D005534:Foot Diseases / Q000000981:diagnostic imaging; D033023:Foot Joints / Q000000981:diagnostic imaging; D006801:Humans; D021621:Imaging, Three-Dimensional; D008297:Male; D008682:Metatarsal Bones / Q000000981:diagnostic imaging / Q000503:physiopathology; D008953:Models, Anatomic; D037081:Posterior Tibial Tendon Dysfunction / Q000150:complications; D013628:Talus / Q000000981:diagnostic imaging; D013639:Tarsal Bones / Q000002:abnormalities / Q000000981:diagnostic imaging; D013977:Tibia / Q000000981:diagnostic imaging; D014057:Tomography, X-Ray Computed / Q000009:adverse effects; D016474:Weight-Bearing / Q000502:physiology; D055815:Young Adult
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