scholarly journals Why are tapes better than wires in knotless rotator cuff repairs? An evaluation of force, pressure and contact area in a tendon bone unit mechanical model

2021 ◽  
Vol 8 (1) ◽  
Author(s):  
Carlos Maia Dias ◽  
Sérgio B. Gonçalves ◽  
António Completo ◽  
Martina Tognini ◽  
Manuel Ribeiro da Silva ◽  
...  
Keyword(s):  
Contact Force ◽  
Contact Area ◽  
Mechanical Model ◽  
Clinical Results ◽  
Peak Force ◽  
Key Factors ◽  
Force Variation ◽  
Cuff Repair ◽  
Retear Rate ◽  
Force Pressure

Abstract Purpose Knotless repairs have demonstrated encouraging performance regarding retear rate reduction, but literature aiming at identifying the specific variables responsible for these results is scarce and conflictive. The purpose of this paper was to evaluate the effect of the material (tape or wire suture) and medial tendon passage (single or double passage) on the contact force, pressure and area at the tendon bone interface in order to identify the key factors responsible for this repairs´ success. Methods A specific knotless transosseous equivalent cuff repair was simulated using 2 tape or suture wire loaded medial anchors and 2 lateral anchors, with controlled lateral suture limb tension. The repair was performed in a previously validated sawbones® mechanical model. Testing analyzed force, pressure and area in a predetermined and constant size “repair box” using a Tekscan® sensor, as well as peak force and pressure, force applied by specific sutures and force variation along the repair box. Results Tapes generate lower contact force and pressure and double medial passage at the medial tendon is associated with higher contact area. Suture wires generate higher peak force and pressure on the repair and higher mean force in their tendon path and at the medial bearing row. Force values decrease from medial to lateral and from posterior to anterior independently of the material or medial passage. Conclusion Contrary to most biomechanical literature, suture tape use lowers the pressure and force applied at the tendon bone junction, while higher number of suture passage points medially increases the area of contact. These findings may explain the superior clinical results obtained with the use uf suture tapes because its smaller compressive effect over the tendon may create a better perfusion environment healing while maintaining adequate biomechanical stability.

scholarly journals P328Initial clinical results with a novel contact force sensing catheter: assessment of safety and feasibility

EP Europace ◽  
2017 ◽  
Vol 19 (suppl_3) ◽  
pp. iii54-iii54
Author(s):  
E. Rexha ◽  
J. Riedl ◽  
C. Lemes ◽  
T. Maurer ◽  
B. Reissmann ◽  
...  
Keyword(s):  
Contact Force ◽  
Clinical Results ◽  
Force Sensing

In-Depth Analysis of Bocce Backhand Throw and Hitting Technology Based on Mechanics Mechanism

2012 ◽  
Vol 246-247 ◽  
pp. 89-93
Author(s):  
Qun Ying Shi
Keyword(s):  
Early Development ◽  
Experimental Analysis ◽  
Mechanical Model ◽  
Experimental Basis ◽  
Key Factors ◽  
Depth Analysis ◽  
The Masses

The bocce movement is a sport, loved by the masses and the sports field in the early development of the technology is more mature. But sports competition is growing as bocce, bocce technology more and more attentions, especially backhand throw to hit the technology. Backhand throw strike technology is the analysis of bocce on the basis of this paper, the establishment of a backhand throw to hit the mechanical model, and thus, by experimental analysis and summary of the key factors affect the backhand throw hit effect, and thus to improve backhand throw hit technology to provide the theoretical and experimental basis.

scholarly journals Analysis of Contact Force Variation between Contact Wire and Pantograph Based on Multibody Dynamics

2010 ◽  
Vol 3 (3) ◽  
pp. 552-567 ◽  
Author(s):  
Mohd Azman ABDULLAH ◽  
Yohei MICHITSUJI ◽  
Masao NAGAI ◽  
Naoki MIYAJIMA
Keyword(s):  
Multibody Dynamics ◽  
Contact Force ◽  
Contact Wire ◽  
Force Variation

scholarly journals Kinetic Analysis of Water Fitness Exercises: Contributions for Strength Development

2019 ◽  
Vol 16 (19) ◽  
pp. 3784 ◽  
Author(s):  
Santos ◽  
Rama ◽  
Marinho ◽  
Barbosa ◽  
Costa
Keyword(s):  
Upper Limb ◽  
Force Production ◽  
Peak Force ◽  
Strength Development ◽  
Isokinetic Dynamometer ◽  
Symmetric Motion ◽  
Pressure System ◽  
Dry Land ◽  
Force Variation ◽  
Selection Of

The evaluation of propulsive forces in water allows the selection of the most appropriate strategies to develop strength during water fitness sessions. The aim of this study was threefold: (i) to analyze the rate of force production; (ii) to analyze the rate of force variation; and (iii) to compare limbs’ symmetry in two water fitness exercises. Twenty-two young health subjects (age: 21.23 ± 1.51 years old, body mass: 67.04 ± 9.31 kg, and height: 166.36 ± 8.01 cm) performed incremental protocols of horizontal adduction (HA) and rocking horse (RHadd), from 105 until 150 b·min–1. Data acquisition required an isokinetic dynamometer and a differential pressure system that allowed the assessment of (a) isometric peak force of dominant upper limb (IsometricFD); (b) propulsive peak force of dominant upper limb (PropulsiveFD); and (c) propulsive peak force of nondominant upper limb (PropulsiveFND). Significant differences were found in the rate of force production (RateFD) between the majority cadences in both exercises. The RateFD reached ~68% of the force in dry-land conditions, and lower cadences promoted a higher rate of force variation (ΔForce). Most actions were asymmetric, except for the HA at 135 b·min–1. In conclusion, the musical cadence of 135 b·min–1 seems to elicit a desired rate of force production with a symmetric motion in both exercises.

scholarly journals Development and Application of a Tandem Force Sensor

Sensors ◽  
2020 ◽  
Vol 20 (21) ◽  
pp. 6042
Author(s):  
Zhijian Zhang ◽  
Youping Chen ◽  
Dailin Zhang
Keyword(s):  
Contact Force ◽  
Mechanical Model ◽  
Traction Force ◽  
Force Sensor ◽  
Teaching Experiment ◽  
Contact Forces ◽  
Contact Tasks

In robot teaching for contact tasks, it is necessary to not only accurately perceive the traction force exerted by hands, but also to perceive the contact force at the robot end. This paper develops a tandem force sensor to detect traction and contact forces. As a component of the tandem force sensor, a cylindrical traction force sensor is developed to detect the traction force applied by hands. Its structure is designed to be suitable for humans to operate, and the mechanical model of its cylinder-shaped elastic structural body has been analyzed. After calibration, the cylindrical traction force sensor is proven to be able to detect forces/moments with small errors. Then, a tandem force sensor is developed based on the developed cylindrical traction force sensor and a wrist force sensor. The robot teaching experiment of drawer switches were made and the results confirm that the developed traction force sensor is simple to operate and the tandem force sensor can achieve the perception of the traction and contact forces.

Multivariate Analysis of Key Factors in Clinical Results of Postcardiotomy Circulatory Support

1998 ◽  
pp. 476-478
Author(s):  
Masaya Kitamura ◽  
Shigeyuki Aomi ◽  
Mitsuhiro Hachida ◽  
Hiroshi Nishida ◽  
Masahiro Endo ◽  
...  
Keyword(s):  
Multivariate Analysis ◽  
Clinical Results ◽  
Circulatory Support ◽  
Key Factors

scholarly journals Ankle Joint Pressure in Supination-External Rotation Injuries: A Dynamic Biomechanic Cadaveric Study

2020 ◽  
Vol 5 (4) ◽  
pp. 2473011420S0030
Author(s):  
Fabian Krause ◽  
Ivan Zderic ◽  
Angela Seidel ◽  
Boyko Gueorguiev ◽  
Marc C. Attinger ◽  
...  
Keyword(s):  
Operative Treatment ◽  
Contact Area ◽  
Peak Pressure ◽  
External Rotation ◽  
Clinical Results ◽  
Deltoid Ligament ◽  
Type Ii ◽  
Type Iv ◽  
Joint Contact ◽  
Supination External Rotation

Category: Ankle; Basic Sciences/Biologics; Trauma Introduction/Purpose: In isolated lateral malleolar fractures of the supination-external rotation (SER) type and competent medial stabilizers (type II and III), non-operative treatment has yielded excellent outcome. With complete rupture of the deltoid ligament (SER type IV) fracture instability increases substantially. The rationale for operative treatment of SER type IV fractures is based upon good clinical results and previous biomechanical studies. A significant reduction of the ankle contact area that however is caused by an artificially forced lateralization of the talus in the ankle mortise has been demonstrated. Presumed resultant elevated joint contact stresses are thought to lead to ankle arthritis in the longterm. Methods: In 12 lower leg specimen SER type injuries were simulated by gradual bony and ligamentous destabilization of the ankle from lateral to medial according to the mechanism of injury as described by Lauge and Hansen. High-resolution pressure sensors placed in the ankle joint recorded tibio-talar pressure changes at physiologic weightbearing (700N) in three positions (plantigrade, 10° dorsiflexion and 20° plantarflexion). Results: With increasing instability changes of the ankle kinematics were seen in SER II and III fractures with the same trend also in SER IV lesions. In the plantigrade position, the medial clear space (MCS) increased significantly from an average of 2.5+-0.4mm (no fracture) to 3.9+-1.1mm (SER type IV fracture). However, the corresponding peak pressure increased only slightly from 2.6+- 0.5 mPa to 3.0+-1.4 mPa on average, and the contact area decreased slightly from 810+-42 mm2 to 735+-27mm2 on average representing a non-significant reduction of only 9% of the contact area (p=0.08) after the deep deltoid ligament was completely dissected.The comparison of the results in plantigrade and plantarflexed position revealed substantial differences for MCS, contact area and center of force. Conclusion: Under physiologic load SER type IV isolated lateral malleolar fracture with completely disrupted deep deltoid ligament led to a significant increase of the MCS, but neither to a significant decrease of the of the joint contact area nor significant increase of peak pressure. Clinical Relevance: The findings of this biomechanical study support the recently reported good clinical results of non-operative treatment of SER type II to IV fractures.

Determination of the Interference Geometry Between Two Convex Objects

2006 ◽  
Author(s):  
Lianzhen Luo ◽  
Meyer Nahon
Keyword(s):  
Contact Force ◽  
Contact Area ◽  
Contact Dynamics ◽  
Continuous Contact ◽  
Application Point ◽  
Haptic Interactions ◽  
Fitting Method ◽  
Best Fitting ◽  
Arbitrary Objects

The determination of the interference geometry between two arbitrary objects is an essential problem encountered in the simulation of continuous contact dynamics and haptic interactions. In these applications, with known material properties, the interbody contact force is only a function of the interference geometry between two objects. Here a theoretical basis and algorithms for the calculation of the interference geometry, such as overlap region, contact area and normal, and interference volume, are presented. Two methods to obtain the contact area and normal are analyzed: an area-weighted method and a best-fitting method. The geometric properties of the area-weighted method are presented and the degenerate cases related to both methods are discussed. Methods to calculate the application point of an interbody contact force are discussed. Some numerical simulation results are presented based on the implementation of the geometric algorithms, which are verified by comparison with hand calculation. The continuity of contact normal and its application point are demonstrated for a case in which the contacting objects smoothly move with respect to each other in the simulation.

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