Wyniki wyszukiwania - BazTech

Ograniczanie wyników

2 Biocybernetics and Biomedical Engineering

2 2014

Znaleziono wyników: 2

Liczba wyników na stronie

Wyniki wyszukiwania

Wyszukiwano:
w słowach kluczowych: spadek stopy

Sortuj według:

Ogranicz wyniki do:

Quantification of gait asymmetry in patients with ankle foot orthoses based on hip–hip cyclograms

Kutilek P., Socha V., Viteckova S., Svoboda Z.

Biocybernetics and Biomedical Engineering

2014

Vol. 34, no. 1

46--52

Our work focuses on a new approach of studying asymmetry in walking based on the orientation of the synchronized bilateral hip–hip cyclograms. Patients with foot drop were included in the study and were asked to walk without an orthosis, and with foot-up splint, calf mounted support strap and ankle wrap. The hip–hip cyclograms were created to quantify gait asymmetry before and immediately after the application of ankle foot orthoses. This approach has never been applied before to study the gait asymmetry in patients with ankle foot orthoses. In order to quantify the gait asymmetry, we have tested the application of the approach based on the inclination angle of the synchronized hip–hip cyclograms. The symmetry index was used as a comparative method to evaluate the symmetry of bipedal walking. The results indicate the correlation between the symmetry index and inclination angle of the synchronized hip–hip cyclograms. The methods based on the inclination angle and symmetry index show slightly different results because the symmetry index depends on discrete variables and is unable to reflect the asymmetry as it evolves over a complete gait cycle. The inclination angle of the hip–hip cyclogram depends on the complete gait cycle. Except for the inclination angles of patients with the support strap, the results show that the new approach did not identify significant improvement in the gait symmetry after the application of the orthoses. The approach based on the orientation of the hip–hip cyclograms can be used as an additional approach for determining the gait asymmetry.

Dynamic simulation of tibialis posterior tendon transfer in the treatment of drop-foot

Kapti A. O.

Biocybernetics and Biomedical Engineering

2014

Vol. 34, no. 2

132--138

An extensive range of studies have been performed to describe kinematics and dynamics of human movements. However, the forces and moments generated by muscles are not measurable. Dynamic simulations are needed to estimate internal loading of the musculo-skeletal system, to establish scientific basis of treatment planning before performing the surgery, and to predict the functional consequences of treatments. In this study, an ankle joint model consisting of 30 bones and 12 muscles was generated by using lower extremity model of OpenSim software. Muscle insertion points were virtually re-defined for simulation of tendon transfer operation of tibialis posterior in treatment of drop foot deformity. Flexion and inversion moments of ankle, and moment arm distances of tibialis posterior before and after operation were investigated comparatively. Tibialis posterior provided the dorsal flexion moment up to 28 N m after transfer, while providing the plantar flexion moment of -14.5 N m before transfer. Moment arm distance became average 33 mm after transfer, while it is average -11 mm before transfer. These increases provided the active dorsal flexion as the treatment of drop foot.