Design, modeling and control of a system for dynamic measuring of leg length discrepancy

Vrhovski, Zoran; Obrovac, Karlo; Mutka, Alan; Bogdan, Stjepan

doi:10.1109/icstcc.2017.8107117

Cited by 2 publications

(5 citation statements)

References 16 publications

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“…A detailed presentation of the IKP of a 3-RPS parallel manipulator is given in [18]. The position vector of the center of the force plate B c in the frame {B} is:…”

Section: Inverse Kinematic Of the 3-rps Parallel Manipulatormentioning

confidence: 99%

“…The angle between the lines p1 and p2 is 169 • , showing that the subject has scoliosis, the angle of the scoliosis being φ = 11 • . Considering that |CoM x | ≥ ε, according to the algorithm in Figure 8 and Equation (18), the right platform should be lifted by 14.88 mm. The responses of the variables monitored during the runtime of the HBBA is shown in Figure 13.…”

Section: Scenario 2: Human Body With Lld and Scoliosismentioning

confidence: 99%

“…For example, in the case of Volunteer 1, the function is convex, while for Volunteer 2 it is concave. This observation can be well-used when creating an adaptation algorithm of the weight variable γ in Equation (18), which would reduce the number of iterations of the HBBA and make LLD measurement a more pleasant experience for the patient. In the future, we plan to continue investigating in that direction by conducting measurements on more subjects in order to receive more relevant data and finally develop an adaptive algorithm for the variable γ .…”

Section: Subjectmentioning

confidence: 99%

“…Since the LLD evaluation is affected by the posture of the human body during the compensation of LLD, we propose a vision system consisting of two cameras and 15 markers placed on predefined anatomical points of the human body to monitor the posture and further help the clinician determine the patient's status. The methodology and system described in this paper were made based on the authors' previous work [16][17][18][19]. A CAD design of the mechanical part of the system is given in [16], and an animation of the CAD system is available via YouTube [17].…”

Section: Introductionmentioning

confidence: 99%

“…A CAD design of the mechanical part of the system is given in [16], and an animation of the CAD system is available via YouTube [17]. In [18], a simple simulation model of dynamic LLD measuring is shown while the first prototype of a mechatronic system for human body's CoM assessment is presented in [19].…”

Section: Introductionmentioning

confidence: 99%

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System for Evaluation and Compensation of Leg Length Discrepancy for Human Body Balancing

Vrhovski¹,

Obrovac²,

Nižetić³

et al. 2019

Applied Sciences

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Leg Length Discrepancy (LLD) causes a shift of the Center of Mass (CoM) of the human body, as well as an asymmetry in load distribution on the lower extremities. Existing LLD evaluation methods do not take into account this shift in the human body’s CoM. In this paper, a methodology and mechatronic system for the Evaluation and Compensation of LLD for Human Body Balancing are described. The human body’s CoM is measured with two force plates located on two parallel manipulators. Since persons with LLD experience a shift in their CoM, by raising the force plate that is under the shorter leg, the human body can be balanced. For this purpose, the Human Body Balancing Algorithm (HBBA) was proposed and developed. By running the HBBA, the height difference between the force plates under the left and right leg can be measured, which then represents the LLD evaluation. Based on this evaluation, it is possible to design and make a shoe insole which compensates the influence of LLD with the goal of equalizing the load on the legs. A virtual mathematical model of the system was created and the simulation results of the HBBA are presented. The mechatronic system, developed and used to conduct experiments and measurements, is described in detail.

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“…A detailed presentation of the IKP of a 3-RPS parallel manipulator is given in [18]. The position vector of the center of the force plate B c in the frame {B} is:…”

Section: Inverse Kinematic Of the 3-rps Parallel Manipulatormentioning

confidence: 99%

Section: Scenario 2: Human Body With Lld and Scoliosismentioning

confidence: 99%

Section: Subjectmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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