Determination of consistent patterns of range of motion in the ankle joint with a computed tomography stress-test

Gabriëlle Josephine Maria Tuijthof*, Maartje Zengerink, Lijkele Beimers, Remmet Jonges, Mario Maas, Cornelis Niek van Dijk, Leendert Blankevoort

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

25 Citations (Scopus)
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Background: Measuring the range of motion of the ankle joint can assist in accurate diagnosis of ankle laxity. A computed tomography-based stress-test (3D CT stress-test) was used that determines the three-dimensional position and orientation of tibial, calcaneal and talar bones. The goal was to establish a quantitative database of the normal ranges of motion of the talocrural and subtalar joints. A clinical case on suspected subtalar instability demonstrated the relevance the proposed method. Methods: The range of motion was measured for the ankle joints in vivo for 20 subjects using the 3D CT stress-test. Motion of the tibia and calcaneus relative to the talus for eight extreme foot positions were described by helical parameters. Findings: High consistency for finite helical axis orientation (n) and rotation (θ) was shown for: talocrural extreme dorsiflexion to extreme plantarflexion (root mean square direction deviation (η) 5.3° and θ: SD 11.0°), talorucral and subtalar extreme combined eversion-dorsiflexion to combined inversion-plantarflexion (η: 6.7°, θ: SD 9.0° and η:6.3°, θ: SD 5.1°), and subtalar extreme inversion to extreme eversion (η: 6.4°, θ: SD 5.9°). Nearly all dorsi - and plantarflexion occurs in the talocrural joint (θ: mean 63.3° (SD 11°)). The inversion and internal rotation components for extreme eversion to inversion were approximately three times larger for the subtalar joint (θ: mean 22.9° and 29.1°) than for the talocrural joint (θ: mean 8.8° and 10.7°). Comparison of the ranges of motion of the pathologic ankle joint with the healthy subjects showed an increased inversion and axial rotation in the talocrural joint instead of in the suspected subtalar joint. Interpretation: The proposed diagnostic technique and the acquired database of helical parameters of ankle joint ranges of motion are suitable to apply in clinical cases.

Original languageEnglish
Pages (from-to)517-523
Number of pages7
JournalClinical biomechanics
Issue number6
Early online date7 Apr 2009
Publication statusPublished - Jul 2009
Externally publishedYes


  • Computed tomography
  • Range of motion
  • Stress-test
  • Subtalar joint
  • Talocrural joint


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