| Popis: |
The objective of this thesis is to gain new insights on the variations in the morphology and kinematics of the frequently injured hindfoot. Following the general introduction, a narrative review demonstrates that, among other findings, only a portion of the maximal range of motion of the talocrural and subtalar joints is used during walking and running. Under compression the stability can be fully attributed to the articular surfaces. Another chapter demonstrates that the dimensions of the sinus tarsi change with foot motion. In the middle region the dimensions are relatively constant. However, at the lateral and medial side dimensions change with motions mainly with an in- or eversion component. Next, a new kind of ankle brace is evaluated in a 3D stress CT test. The kinematic analysis shows that the main motion for ankle sprains is significantly restricted with the brace without limiting other motions. Another chapter shows that the posterior calcaneal articulating facet can be modelled as a part of a cylinder. This facilitates 3D expression of its orientation. In a subsequent chapter, also using cylinder models, an analysis of the 3D interrelationship of the superior and inferior talar facets demonstrates that the calcaneus is placed in more valgus instead of varus in patients with chronic ankle instability compared to controls. The final chapter before the general discussion shows that there are left-right differences in the morphology and morphometry of the talocalcaneal joints. No significant relationship was demonstrated between these measurements and cartilage damage. |
