1,721,015 research outputs found
Letter to the Editor concerning "Is the 4 mm height of the vertebral artery groove really a limitation of C1 pedicle screw insertion?" (by Da-Geng Huang, Si-Min He, Jun-Wei Pan, et al. Eur Spine J, 2014, 23(5):1109-1114)
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Answer to the Letter to the Editor concerning "Is the 4 mm height of the vertebral artery groove really a limitation of C1 pedicle screw insertion" by Da-Geng Huang, et al. Eur Spine J (2014) 23(5):1109-1114. [Eur Spine J. 2014]
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Is the 4 mm height of the vertebral artery groove really a limitation of C1 pedicle screw insertion? [Eur Spine J. 2014
Vertebral rotation in adolescent idiopathic scoliosis calculated by radiograph and back surface analysis-based methods: Correlation between the Raimondi method and rasterstereography. Eur Spine J;22:2336-2337 - Statistical perspectives part II
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Letter to the Editor concerning "vertebral rotation in adolescent idiopathic scoliosis calculated by radiograph and back surface analysis-based methods: Correlation between the Raimondi method and rasterstereography"
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Letter to the Editor concerning "Range of motion of thoracic spine in sagittal plane"
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Letter to the Editor concerning "Calculation of corrected body height in idiopathic scoliosis: comparison of four methods" by M. Tyrakowski et al. (Eur Spine J, doi:10.1007/s00586-014-3275-1)
No full textWalking and running on treadmill: the standard criteria for kinematics studies
Full text linkIn humans, walking and running represent the most studied locomotion forms. The motorized treadmill has always been a very useful scientific tool, because it allows administer a variety of speed/slope combinations, which is not always easy-to-find in nature. The purpose of this short communication is to help improve the scientific use of the treadmill and explain some simple kinematics variables together with simple ways to measure/calculate them
Halteres used in ancient Olympic long jump
No full textHalteres are hand-held weights that were first used in the standing long jump in the eighteenth ancient Olympiad in 708 bc, and may have been introduced either to make the challenge more difficult or to extend the jumping distance. Here we use computer and experimental simulations to determine the optimal mass of halteres that would be needed to maximally extend a standing long jump, and find that this corresponds closely to the size range of actual archaeological specimens. These halteres were made of stone or lead and weighed 2−9 kg, which we calculate would increase a 3-metre jump by at least 17 cm, indicating that their purpose was to boost the performance of pentathletes. Halteres may therefore be the earliest passive tool that was devised to enhance human-powered locomotion
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