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Anatomic Drivers of J-Sign Presence and Severity: If There Is a Jump, Look for a Bump.
Am J Sports Med
March 2025
Rush University Medical Center, Chicago, Illinois, USA.
Background: Medial patellofemoral ligament reconstruction is frequently indicated for recurrent lateral patellar instability. The preoperative presence and severity of a J-sign have been associated with poorer postoperative outcomes.
Purpose: To determine the underlying anatomic factors that contribute to the presence, severity, and jumping quality of the J-sign.
Biomechanical assessment of unilateral/bilateral lumbar spondylolysis with and without muscle weakness using finite element analysis.
Heliyon
February 2025
Spine Research Center of Wannan Medical College, Wuhu, China, 22, Wenchang West Road, China, Wuhu, 241001, China.
Background: Spondylolysis is commonly linked to low back pain in athletes, and the connection between muscle weakness and spondylolysis is unclear. Therefore, this study examined the biomechanics of spondylolysis and influence of muscle weakness by finite element (FE) analysis.
Methods: A patient's L1-S1 lumbosacral unit was scanned by computed tomography, and generated a three-dimensional pathology-free FE model.
Axial rotation of the hinge axis can cause changes in coronal tibial alignment in anterior tibial closing wedge osteotomy in a 3D simulation model.
J Exp Orthop
January 2025
Department Trauma Surgery BG Unfallklinik Murnau Murnau German.
Purpose: Clinical evidence indicates that an unintended increase in the medial proximal tibial angle (MPTA) can occur during slope-reducing tibial osteotomies, which is most relevant in anterior cruciate ligament (ACL) deficient knees. Therefore, the purpose of this three-dimensional (3D) simulation study is to assess how axial or coronal hinge axis rotation affect alignment parameters in anterior tibial closing wedge osteotomies (ACWO). The hypothesis states that a neutral hinge axis (NHA) in ACWO prevents changes in coronal and axial alignment.
View Article and Find Full Text PDFEquivalent-input-disturbance based rotating control of drill-string in compound directional drilling process subject to coal seam variation.
ISA Trans
February 2025
School of Automation, China University of Geosciences, Wuhan 430074, China; School of Future Technology, China University of Geosciences, Wuhan 430074, China; Hubei Key Laboratory of Advanced Control and Intelligent Automation for Complex Systems, Wuhan 430074, China; Engineering Research Center of Intelligent Technology for Geo-Exploration, Ministry of Education, Wuhan 430074, China. Electronic address:
Coal seam variations in coal mine drilling can cause fluctuations in feed speed and rotational speed of the rotary head (ROR), reducing the performance of compound directional drilling control systems. This paper addresses these issues by considering the change in intrinsic specific energy caused by coal seam variations as a disturbance. An equivalent-input-disturbance (EID) based control system is designed to mitigate these effects.
View Article and Find Full Text PDFFinite element analysis of the Fibula's contribution to lower extremity torsional stiffness.
J Orthop
March 2025
D.A. Scientific Research and Internationalization, University of Messina, Via Consolato Del Mare 41, 98121, Messina, Italy.
Aims: The purpose of this article is to investigate the effects of the fibula on the torsional stiffness of the lower limb. A comprehensive model of the lower limb was constructed, including the resected femur, patella, tibia, fibula, and foot, with tendons and ligaments. Two configurations were developed, with and without the presence of the fibula, to evaluate the resulting stress state and consequently determine the contribution of the fibula to the torsional stiffness of the lower limb.
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