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| http://dx.doi.org/10.4097/kja.22099.e1 | DOI Listing |
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Uncovering the hidden mechanics of upper body rotations in tennis serves using wearable sensors on Dutch professional players.
Front Sports Act Living
January 2025
Department of Human Movement Sciences, Faculty of Behavioural and Movement Sciences, Vrije Universiteit Amsterdam, Amsterdam, Netherlands.
Background: It is assumed that the tennis serve is performed according to the kinetic chain principle in which a proximal-to-distal sequence in peak angular velocities of subsequent body segments can be observed to reach high end point ball velocities. The aim of the present study was to investigate if the magnitude and (intersegmental) timing of peak angular velocities of body segments in professional tennis players are different between first and second serves and if they are associated with serve performance.
Methods: Eight (two female and six male) professional tennis players performed each 48 tennis serves on a tennis court.
Automatic skeletal maturity grading from pelvis radiographs by deep learning for adolescent idiopathic scoliosis.
Med Biol Eng Comput
January 2025
School of Information, Yunnan University, East Outer Ring South Road, Kunming, 650504, China.
Adolescent idiopathic scoliosis (AIS) is a three-dimensional spine deformity governed of the spine. A child's Risser stage of skeletal maturity must be carefully considered for AIS evaluation and treatment. However, there are intra-observer and inter-observer inaccuracies in the Risser stage manual assessment.
View Article and Find Full Text PDFUnilateral Lumbo-Pelvic Fixation for Denis Type I Unilateral Sacral Fracture: A Finite Element Analysis.
JOR Spine
March 2025
Department of Trauma Surgery, Orthopaedics and Plastic Surgery University Medical Center Göttingen Göttingen Germany.
Background: Unilateral sacral fractures with posterior ring instability represent a prevalent type of posterior pelvic ring fracture. While lumbo-pelvic fixation is recognized as a highly stable method, the sufficiency of unilateral lumbo-pelvic fixation (ULF) for such fractures remains under debate.
Purpose: This study aims to assess the biomechanical stability of ULF compared to traditional bilateral lumbo-pelvic fixation (BLF) and triangular osteosynthesis (TO), incorporating clinical observations, and previous biomechanical data.
Feasibility of robot-assisted system for navigated needle positioning in the PCNL procedure in vitro.
World J Urol
January 2025
Department of Urology, Beijing Jishuitan Hospital, Capital Medical University, Beijing, 102208, China.
Purpose: The objective of this study was to explore the feasibility of using the TianJi Robot system for navigated needle positioning in the PCNL procedure in vitro.
Methods: A pig kidney with a segment of ureter was selected as the in vitro organ model. Iodine contrast agent was infused into the renal pelvis to dilate the renal pelvis and calyx to establish the in vitro hydronephrosis model.
A three-dimensional kinematic analysis of bipedal walking in a white-handed gibbon (Hylobates lar) on a horizontal pole and flat surface.
Primates
January 2025
Laboratory of Biological Anthropology, Graduate School of Human Sciences, Osaka University, Suita, Osaka, Japan.
Gibbons, a type of lesser ape, are brachiators but also walk bipedally and without forelimb assistance, not only on the ground but also on tree branches. The arboreal bipedal walking strategy of the gibbons has been studied in previous studies in relation to two-dimensional (2D) kinematic analysis. However, because tree branches and the ground differ greatly in width, leading to a constrained foot contact point on the tree branches, gibbons must adjust their 3D joint motions of trunk and hindlimb on the tree branches.
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