PubMed Health⌕ Search
Home/Archive/PubMed

PubMed · 6965196

A biomechanical model for actively controlled snow ski bindings.

M L Hull·J E Ramming
View original source ↗Export metadata ↓

Abstract

Active control of snow ski bindings is a new design concept which potentially offers improved protection from lower extremity injury. Implementation of this concept entails measuring physical variables and calculating loading and/or deformation in injury prone musculoskeletal components. The subject of this paper is definition of a biomechanical model for calculating tibia torsion based on measurements of torsion loading between the boot and ski. Previous control schemes have used leg displacement only to indicate tibia torsion. The contributions of both inertial and velocity-dependent torques to tibia loading are explored and it is shown that both these moments must be included in addition to displacement-dependent moments. A new analog controller design which includes inertia, damping, and stiffness terms in the tibia load calculation is also presented.

Explore related subjects

Accidental FallsAthletic InjuriesBiomechanical PhenomenaHumansModels, BiologicalSkiingJournal Article

Keep this discovery

Explore connections, maps & timelines

BibTeXRIS

M L Hull, J E Ramming. 1980. A biomechanical model for actively controlled snow ski bindings.. https://doi.org/10.1115/1.3138230

Cite the original work for its findings. Save a collection to share your selection of sources.

KEEP EXPLORING

Related citations

PubMed2007

Escitalopram in the long-term treatment of major depressive disorder in elderly patients.

AIM: The primary aim was to investigate the long-term safety and tolerability of escitalopram (10 or 20 mg/day) treatment of elderly patients suffering from major depressive disorder. The secondary aim was to examine response to treatment, as measured by change in the Montgomery-Asberg Depression Rating Scale (MADRS) total score from study entry to each visit, using observed cases. METHOD: This extension trial included 225 patients who had completed an 8-week, double blind, placebo-controlled lead-in study, which was performed in outpatients in primary care and in specialist clinics. The intent-to-treat population comprised 223 patients. RESULTS: The overall withdrawal rate was 24%. The most common reason for withdrawal was adverse events (9%). The 5 most common adverse events were accidental injury, rhinitis, weight increase, arthralgia and coughing, with an incidence ranging from 8 to 13%. No new types of adverse events were reported in this extension study compared to the 8-week lead-in study. The mean weight increased from 69.7 kg at study entry to 70.3 kg at endpoint. The percentage of patients in remission (MADRS total score < or = 12) increased from 48% at study entry to 72% by week 52. CONCLUSION: Escitalopram demonstrated a favourable tolerability profile during 52 weeks of open-label treatment of elderly patients, with further improvement in depressive symptoms.

Accidental Falls↗
PubMed2007

MRI of rupture of the spring ligament complex with talo-cuboid impaction.

The spring ligament complex is essential for the stability of the longitudinal arch of the foot and includes the ligaments between the calcaneus and the talus at the superomedial to inferoplantar aspect of the foot. Tears of the spring ligament complex are most commonly degenerative in etiology and secondary to concomitant abnormality of the posterior tibial tendon. We report MRI findings in a 30-year-old man who presented with traumatic rupture of the spring ligament complex, seen following dislocation of the talonavicular joint. We also describe the previously unreported MRI features of talo-cuboid impaction secondary to disruption of the spring ligament complex.

Accidental Falls↗