Designing a Specialized Devices for Correction of the Axis Deviation at the Human Leg

Abstract

The presented article is an original contribution which implies the design of a specialized device for high tybial osteotomy (HTO) optimization. In the papers are presented the sources that imply HTO, the axial deviations of the human lower member from the correct position. This sources are the gonarthosys owed to the usage of the knees cartilages or owed to some diseases (such as the Blount disease) and the vicious consolidated fractures. After presenting the needs to realize such a specialized device for HTO, the principal requests the device shall fulfill are underlined. Starting from these , two sub ensembles were projected, one for the tibial positioning and for the execution of the hole from the center of rotation of angulation (CORA), and the second one for the realization of the cuts. Both sub ensembles have been 3D modeled in Catia V5R20. The model was designed mounted on the bone.

Experimental modular stand used for studies of the High Tibial Osteotomy

“…For the design of the stand, specialty articles were studied in order to determine the current stage of research in this domain [5]. The other information came from analysing the necessities, from which we extracted the functions that the stand should accomplish.…”

“…This ensemble will be mounted on the machine's table. The system is useful for the study of both the opening HTO and the closing HTO (see figures 4,5).…”

CAD modelling of the human femur taking into account the structure of the bone

“…The computer-assisted 3D human bones modelling is a very frequent method while elaborating biomechanical and bioengineering researches [1][2][3][4][5][6][7]. Developing the 3D models for the human lower limb assure good premises regarding the comprehension of the shape and kinematics of these complex geometric structures, biomechanical analyses of the human 3D foot assembly, for healthy subjects and for pathological conditions as well, alongside with virtual surgeries simulations [4][5][6][7].…”

“…Developing the 3D models for the human lower limb assure good premises regarding the comprehension of the shape and kinematics of these complex geometric structures, biomechanical analyses of the human 3D foot assembly, for healthy subjects and for pathological conditions as well, alongside with virtual surgeries simulations [4][5][6][7]. These specific methods allow elaborating studies and further design of specialized devices, used within surgeries [1][2][3]8]. The present paper fits within this context, being focused on the human femur 3D modelling.…”

Parametrised Design of a Cutting Device Used for High Tibial Osteotomy

“…1. Mechanical axis (aligned and deviated) of the human's lower member [1,5] High Tibial Osteotomy imply creating a cut in the shape of a wedge on the lateral or median surface of the tibia and perform a rotation movement which will realign the leg's mechanical axis. In consequence, a normal load on the leg's joint will be displaced with diminished tensions on the affected area.…”