On the estimation of joint kinematics during gait

Ramakrishnan, H.K.; Kadaba, M. P.

doi:10.1016/0021-9290(91)90175-m

Cited by 149 publications

(88 citation statements)

References 16 publications

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“…When 3-D image data are available, rather than plane X-rays, interactive 3-D animation should be even more effective. Such graphical techniques offer the possibility to present 3-D motion data for the knee joint without the problem of ''kinematic cross-talk'' that renders 3-D joint angles sensitive to small errors in the definition of anatomical coordinate axes (Blankevoort et al, 1990;Ramakrishnan and Kadaba, 1991). It should be noted, however, that quantitative comparisons between subjects or movement conditions can only be performed when the FHA position and orientation are quantified with respect to a well-defined anatomical coordinate system, as in Fig.…”

Section: Discussionmentioning

confidence: 99%

Helical axes of skeletal knee joint motion during running

Bogert

Reinschmidt

Lundberg

2008

Journal of Biomechanics

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Section: Discussionmentioning

confidence: 99%

Helical axes of skeletal knee joint motion during running

Bogert

Reinschmidt

Lundberg

2008

Journal of Biomechanics

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“…Such a technique is provided by the determination of the helical axis: in this representation the instantaneous motion of a rigid body is decomposed into an infi nitesimal rotation ⌬ around the helical axis (also called screw axis or motion screw) and an infi nitesimal translation ⌬ T along it. The helical axis model yields a comprehensive three-dimensional description of rigid body motion and has been widely used to study joint kinematics in cadavers [Spoor and Veldpaus, 1980;Spoor, 1984;Siegler et al, 1988;de Lange et al, 1990;Oxland et al, 1994;Woltring et al, 1994;Zdravkovic et al, 1994;Fitzpatrick et al, 1995;Borrelli et al, 1997] as well as in living subjects to investigate the movements of healthy and pathological joints [Fioretti et al, 1990;Hart et al, 1991;Ramakrishnan and Kadaba, 1991;Winters et al, 1993;Jonsson and Karrholm, 1994;Woltring et al, 1994;Schendel et al, 1995;Osterbauer et al, 1996].…”

Section: Mandibular Helical Axismentioning

confidence: 99%

Modeling of Temporomandibular Joint Function Using MRI and Jaw-Tracking Technologies – Mechanics

Gallo¹

2005

Cells Tissues Organs

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The study of mechanics of the temporomandibular joint (TMJ) is important because its dysfunction and breakdown could be, at least partially, of mechanical origin. The incongruity of the articular surfaces of the TMJ is compensated by a fibrocartilaginous articular disc. Its dislocation and failure seem to be closely related to the development of osteoarthritis of the TMJ. The analysis of mandibular kinematics permits the detection and assessment of irregularities of TMJ function due to internal obstacles such as a displaced articular disc. Furthermore, the measurement of the dynamic relationship between the articular surfaces of the TMJ is useful to determine the strains undergone by the disc that if too high might compromise its integrity. The development of our research in TMJ mechanics has evolved from the acquisition of the traces of single mandibular points to an accurate and compact description of mandibular motion, in which the mechanical advantage of jaw muscles, and forces and torques acting on the jaw are considered as well. The combination of three-dimensional software models of TMJ anatomies obtained from MRI and jaw tracking with six degrees of freedom permits a subject-specific dynamic analysis of the intra-articular space, providing insight into individual disc deformation during function and TMJ loading. Studies performed with this system indicate that both TMJs are loaded during chewing, the balancing more so than the working joint. In fact, during chewing, the intra-articular distance is smaller for hard than for soft food, on closing than on opening, on the balancing than on the working side. This last finding is confirmed by static biting experiments, in which the condyle-fossa distance decreases more on the side contralateral to the bite force, depending on its magnitude. Also studies on the dynamics of compression areas indicate that plowing can occur through the disc during function, especially mediolaterally, due to stress field translation. This effect might contribute to cartilage wear and fatigue also because the disc is weaker mediolaterally. Further data indicate that the lateral area of the disc is mostly exposed to a higher mechanical energy density. This will be more intensively investigated using finite element method.

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“…Rarnaknshnan (Rarnakrishnan and Kadaba, 1991) manipulated the anatomicd thigh CO-ordinate system along the longitudinal axis and reported no effects on flexiodextension but significant errors in abladduction and intemaVextema1 knee rotations (Reinschrnidt, 1996). The problem of defining the anatomical CO-ordinate system makes comparisons across subject and studies difficult since subtle differences may easily be caused by small deviations in anatomical reference alignment (Reinschrnidt, 1996).…”

Section: Anatomical Co-ordinate System and Cross Taikmentioning

confidence: 99%