مهندسی مکانیک مدرس

مهندسی مکانیک مدرس

طراحی بیومکانیکی بریس نوین باربردار کمپارتمان داخلی زانو

نوع مقاله : مقاله پژوهشی

نویسندگان
1 گروه مهندسی مکانیک، دانشگاه مازندران، بابلسر، ایران
2 گروه مهندسی مکانیک، دانشگاه صنعتی شاهرود، شاهرود، ایران
10.48311/mme.2025.96846.0
چکیده
بریس‌های باربردار کمپارتمان داخلی زانو معمولاً با هدف حذف درد در این ناحیه توسعه می‌یابند. به‌منظور پیشگیری از تماس استخوان - استخوان در مفصل زانو، برای اولین‌بار یک مکانیسم جدید مبتنی بر یک‌ رویه بیومکانیکی نوآورانه برای باربرداری از زانو طراحی شده است. باتوجه ‌به تأثیر قابل‌توجه گشتاور فلکشن - اکستنشن زانو بر نیروی تماس تیبیوفمورال، در این پژوهش از رویه‌ای استفاده می‌شود که به طور هم‌زمان عمق نفوذ غضروف و نیروی تاندون کشکک را محاسبه می‌کند که این دو پارامتر، عوامل اصلی در اعمال گشتاور فلکشن - اکستنشن زانو هستند. در نتیجه، بریس باربردار جدید با اعمال گشتاور فلکشن - اکستنشن زانو، موجب کاهش عمق نفوذ از طریق طراحی نوین بریس شده و به حذف درد در آرتروز زانو می‌پردازد. ما مرکز آنی دوران زانو را محاسبه کرده و یک مفصل فلکشن جدید برای ردیابی مرکز آنی دوران زانو طراحی نموده‌ایم تا نیروهای نامطلوب را کاهش دهد. مفصل فلکشن بریس به‌دقت مرکز آنی دوران را ردیابی می‌کند. علاوه بر این، یک کابل انعطاف‌پذیر برای اعمال گشتاور اکستنشن طراحی شده است. نتایج نشان می‌دهد که گشتاور اکستنشن ۳۶.۲۵ نیوتن‌متر منجر به کاهش ۰.۳ میلی‌متری عمق نفوذ غضروف می‌شود. مکانیسم تعبیه‌شده در بریس، گشتاور اکستنشن زانو را از طریق طناب انعطاف‌پذیر اعمال می‌کند که حداکثر نیروی کمکی معادل ۱۳۷۵ نیوتن را تأمین می‌نماید. در نهایت، با محاسبه میزان گشتاور فلکشن - اکستنشن زانو، برای اولین‌بار رابطه بین گشتاور جبرانی اعمال‌شده توسط بریس و کاهش نیروی تماس تیبیوفمورال مشخص گردید.
کلیدواژه‌ها

موضوعات


عنوان مقاله English

Biomechanical Design of a Novel Medial Unloader Knee Brace

نویسندگان English

Amirhosein Javanfar 1
Mahdi Bamdad 2
Atieh Tourang 1
1 Mechanical Engineering Department, University of Mazandaran, Babolsar, Iran
2 2 Mechanical Engineering Department, Shahrood University of Technology, Shahrood, Iran
چکیده English

Medial unloader braces are often developed to achieve pain elimination of the knee medial compartment. In order to prevent bone-bone contact in the knee joint, a new mechanism is designed to unload the knee based on a novel computational procedure for the first time. As the knee flexion-extension moment has a high impact on tibiofemoral contact force, we use the procedure that calculates the cartilage penetration depth and the force in the patellar tendon simultaneously which are the main parameter for applying computational knee flexion-extension torque. Therefore, the new unloader brace applies computational knee flexion-extension torque, then it decreases the penetration depth by the novel brace to eliminate pain in knee osteoarthritis. We calculate the instantaneous center of rotation of the knee and design a new flexion hinge for tracking the desired instantaneous center of rotation reducing unwanted forces. The novel brace flexion hinge tracks the instantaneous center of rotation accurately. Moreover, the flexible cord is designed to apply extension torque. It concluded that the 36.25 Nm of the extension moment leads to 0.3 mm cartilage penetration depth reduction. The embedded mechanism applies knee extension moment by the flexible cord to support assistive extension moment with the maximum amount of 1375 N. Finally, by computing the magnitude of knee flexion-extension torque, we know the relation between compensated moment applied by the brace and tibiofemoral contact force reduction for the first time.

کلیدواژه‌ها English

Knee dynamics, Contact model, Cartilage penetration depth, unloader brace, Flexion extension moment
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