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3D Finite Element Modelling of a Carpometacarpal Implant Coated with Hydroxy Apatite
Published in J. Middleton, M. L. Jones, G. N. Pande, Computer Methods in Biomechanics & Biomedical Engineering – 2, 2020
Among the methods used to treat osteoarthritis of the carpometacarpal joint, located at the thumb base, is total joint prosthesis which is a ball-and-socket implant like the hip endoprosthesis. The implant under study is the ARPE® non-cemented prosthesis (Merck Biomaterial France and Pr J.J. COMTET). The stem, coated with plasma-sprayed hydroxyapatite, is press-fitted into the first metacarpal bone. The hydroxyapatite coating is a bioactive material giving a lifelong biological bond with the surrounding bone [1], [2], [3]. Clinical investigations on retrieved implants (hip prosthesis) (between 8 weeks and 15 months after surgery) showed an early bone deposition on the coating as well as on the cancellous bone, leading to early bridging of bone between them [4], [5]. However reduction in the thickness of the hydroxyapatite coating has been recently observed [1], [2], [5],
A New Dataset and Neural Networks Models to Estimate the Joint Coordinates of Human Hand from Electromyographic Signals
Published in Cybernetics and Systems, 2022
S. Kirchhofer, T. Chateau, C. Bouzgarrou, J.-J Lemaire
The kinematic architecture of the hand is complex, and we have to do some simplifications to design a robotic hand. Obviously, some degrees of freedom (DoF) are more usefully for common task as grasping. This 18 DoF model (Figure 2) is inspired by Lenarcic, Bajd, and Stanišić (2013) and robotic hand designs by Gosselin, Pelletier, and Laliberte (2008), Matheson et al. (2016), Zollo et al. (2007), Deimel and Brock (2016), and Piazza et al. (2017). The abduction-adduction of metacarpophalangeal joints are not taken into account. The amplitude of these joints is small and not essential for grasping tasks, and the actuation by the interossei muscles is hard to simulate. We consider the wrist/forearm and thumb carpometacarpal joint as universal joints. This emphasizes a simplification of the hand which is not detrimental to perform gestures. All the carpal bones are assimilated to rigid bodies. Interphalangeal joints are modeled as revolute joints. The computation of joint coordinates is performed by the Euclidean coordinates of the joint centers.
Quantifying wrist angular excursion on impact for Jab and Hook lead arm shots in boxing
Published in Sports Biomechanics, 2021
Ian Gatt, Thomas Allen, Jonathan Wheat
In 1987, Noble (Noble, 1987) stated that if hyperflexion of the wrist occurred on impact in boxing it would injure the carpometacarpal joint of the hand. To date, no study has measured wrist motion in boxing. Flexion in the sagittal plane appears to be the only wrist movement considered on impact (Loosemore et al., 2017; Noble, 1987). Kinematic studies, however, describe a biplanar coupled motion occurring naturally in daily activities, described as dart-throwing motion of the wrist (Garcia-Elias et al., 1995; Ishikawa et al., 1999; Moritomo et al., 2004; Saffar & Semaan, 1994; Wolfe et al., 2006), rather than a uniaxial motion. Dart-throwing motion, involving an arc of motion from radial deviation and wrist extension to ulnar deviation and wrist flexion, occurs during many activities of daily living and sports (Fisk, 1980; Moritomo et al., 2004; Palmer et al., 1985; Sweeney et al., 2012). For example, Sweeney et al. (2012) observed that during the downswing in golf, both wrists experienced flexion and ulnar deviation. The dart-thrower’s arc is described as the most stable and controllable plane of motion, representing the functional plane of wrist motion for most occupational and avocational activities (Garcia-Elias et al., 1995; Ishikawa et al., 1999; Moritomo et al., 2004; Saffar & Semaan, 1994; Wolfe et al., 2006).
Development of an upper-limb neuroprosthesis to voluntarily control elbow and hand
Published in Advanced Robotics, 2018
Yosuke Ogiri, Yusuke Yamanoi, Wataru Nishino, Ryu Kato, Takehiko Takagi, Hiroshi Yokoi
The robot hand has two degrees of freedom of motion in the carpometacarpal joint (CM joint) of the thumb and metacarpophalangeal joint (MP joint) of the other four fingers [11]. Two compact servomotors (Hyperion Atlas HP-DH16-FTD, max torque 12.0 kgf cm) are used for these drive joints. Using this, it is possible to obtain three different hand griping postures: power grip, precision grip, and lateral grip, as shown in Figure 2. In addition, the ring finger and little finger fixed with springs are passive and support three kinds of griping postures. It is reported that these three gripping postures cover 85% of the activities of daily living (ADL) [12]. The size of the hand chosen is the average value of female adults. The hand parts are molded using 3D layered modeling (ABS resin). Moreover, a stable grip is enabled by attaching an elastomer glove simulating the finger pad and palm [13].