CONTEXT Injuries to the anterior cruciate ligament (ACL) of the knee are immediately debilitating and can cause long-term consequences, including the early onset of osteoarthritis. It is important to have a comprehensive understanding of all possible risk factors for ACL injury to identify individuals who are at risk for future injuries and to provide an appropriate level of counseling and prog...

Although locomotor kinematics in walking and running birds have been examined in studies exploring many biological aspects of bipedalism, these studies have been largely limited to two-dimensional analyses. Incorporating a five-segment, 17 degree-of-freedom (d.f.) kinematic model of the ostrich hind limb developed from anatomical specimens, we quantified the three-dimensional (3-D) joint axis a...

background: modern knee designs have popularized its use in younger patients due to its better performance. there remains uncertainty whether higher demands of these patients can affect implant survivorship.    purpose: to assess whether modern knee designs have provided similar results in patients younger than 70 years versus older patients. methods: we included 203 consecutive patients (236 k...

introduction: knee joint osteoarthritis is one of the most prevalent musculoskeletal problems in adult population, which cause pain and functional limitations. involvement of medial compartment is almost 10 times more common than lateral compartment, which results in varus deformity among patients with medial compartment osteoarthritis of knee joint. main objectives in the treatment of knee joi...

this paper concerns the design and analysis, of a ball type continuously variable transmission, (b-cvt). this b-cvt has a simple kinematic structure, and same as a toroidal cvt, transmits power by friction on the contact points between input and output discs, that are connected to each other by balls. after, a brief introduction of our b-cvt structure, the performance and traction efficiency of...

knee osteoarthritis can have negative effects on the physical and mental conditions, social and family relations, general health and positive feelings of elders. for example, severe limitation of motion and increased depression, which are results of this disease, can have negative impacts on elders. the purpose of this study was to compare the levels of depression in healthy active and inactive...

the resistant* of patesa against lateral displacement (le. the stability), was studied tinder a range of conditions in vitro, at a range of knee flexion angles. muscle forces were applied in physiological directions along the separate quadriceps muscles. normal muscle actions with constant tension showed constant patellar stability up to sixty degrees knee flexion, and then a significant increa...

Background: Anterior Cruciate Ligament) ACL (injury is the most prevalent knee ligament injury during exercise, with a frequency of 36.9 per 100000 individuals. The one characteristic of this injury is proprioception dysfunction. The current study investigated the knee proprioception in soccer players after ACL reconstruction. Methods: The study participants consisted of 20 elite male soccer p...