نشریه علمی مهندسی پزشکی زیستی
Iranian Journal of Biomedical Engineering (IJBME)

استفاده از تغییرات مرکز جرم جهت بررسی تعادل افراد دارای اختلاف طول پا در هنگام بالا رفتن از پله

نوع مقاله : مقاله کامل پژوهشی

نویسندگان

سید مهران آیتی نجف‌آبادی 1
علیرضا هاشمی اسکویی 2
سید مسعود رفیعایی 3

1 کارشناسی ارشد، گروه بیومکانیک، دانشکده‌ی مهندسی پزشکی، دانشگاه صنعتی سهند، تبریز، ایران

2 استادیار، گروه بیومکانیک، دانشکده‌ی مهندسی پزشکی، دانشگاه صنعتی سهند، تبریز، ایران

3 استادیار، گروه توان‌بخشی، دانشکده‌ی توان‌بخشی، دانشگاه علوم پزشکی اصفهان، اصفهان، ایران

https://doi.org/10.22041/ijbme.2021.529960.1689
چکیده
حفظ تعادل در حرکت‌های روزمره از جمله حرکت روی پله، یکی از مشکلات افراد دارای اختلاف طول پا است. این افراد برای جبران تفاوت طول دو پا، الگوی حرکت خود را از حالت عادی تغییر می­دهند. در اثر تغییر الگوی حرکت، مختصات مرکز جرم بدن که یکی از عوامل مهم در حفظ تعادل است، تغییر می­کند. برای تصحیح الگوی حرکت، استفاده از روش­های اصلاحی مانند به کار بردن کفی جبران کننده­ تجویز می­شود. هدف این مطالعه بررسی تغییرات مرکز جرم، با و بدون استفاده از کفی در افراد دارای اختلاف طول پا در بالا رفتن از پله است. در این مطالعه حرکت 20 شرکت کننده در هنگام بالا رفتن از پله در دو گروه افراد سالم و افراد دارای کوتاهی پا توسط سیستم سه‌بعدی آنالیز حرکت ثبت شده است. تغییرات زوایای مفاصل لگن، زانو و مچ پا با مدل 7 عضوی از روش اویلر محاسبه شده، سپس ماتریس­های دوران و انتقال اندام­ها به دست آمده و با استفاده از آن­ها بازوی ممان­های عضوها تعیین شده است. تغییرات مرکز جرم در سه جهت از روش مجموع ممان­های کل بدن به دست آمده است. تغییرات بین گروه آزمون و کنترل با استفاده از آزمون آماری t مستقل و زوجی در سطح اطمینان 95% مقایسه شده است. نتایج نشان داده که جابه‌جایی مرکز جرم در هر سه جهت برای افراد دارای اختلاف طول پا از نظر آماری به طور معناداری متفاوت از افراد سالم بوده (05/0p<) و تنها دامنه‌ی حرکتی مرکز جرم افراد دارای عارضه در محور عمودی تفاوت معنی­داری از خود نشان نداده است (05/0p>). بر اساس یافته­های این تحقیق می­توان نتیجه گرفت که در بالا رفتن از پله، استفاده از کفی جبران کننده توسط افراد دارای اختلاف طول پا به تنهایی نمی­تواند تغییرات مرکز جرم به عنوان یکی از شاخصه‌های سنجش تعادل را مانند افراد عادی بهبود بخشد.

کلیدواژه‌ها

اختلاف طول پا
کفی جبران کننده
مرکز جرم
پله
موضوعات

عنوان مقاله English

Using Changes in the Center of Mass to Measure the Balance in People with Different Leg Lengths when Climbing Stairs

نویسندگان English

Seyed Mehran Ayati Najafabadi 1
Alireza Hashemi Oskouei 2
Seyed Masoud Rafiaei 3
1 M.Sc., Department of Biomechanics, Department of Biomedical Engineering, Sahand University of Technology, Tabriz, Iran
2 Assistant Professor, Department of Biomechanics, Department of Biomedical Engineering, Sahand University of Technology, Tabriz, Iran
3 Assistant Professor, Department of Rehabilitation, Isfahan University of Medical Sciences, Isfahan, Iran
چکیده English

Balance in daily movements like as stair ascending is a challenge for the people with leg lengths discrepancy (LLD). These people change their pattern of movement to compensate the difference between legs’ length. Due to the changes in movement pattern, body's center of mass which is one of the important factors in maintaining balance can be varied.  Compensatory insoles are used to compensate for short legs. The aim of this study is to investigate changes in the center of mass, with and without using insoles in people with leg length discrepancy when climbing stairs. In this practical cross-sectional study, the movement of 20 participants while climbing stairs in two groups of healthy people and people with LLD was recorded by a three-dimensional movement analysis system. Changes in pelvic, knee and ankle joint angles were calculated with the 7-member Euler method. Then the rotation and transferring matrixes were defined by using the joint angles to determine the torque arm of the limbs.  By the total body torque method, the center of mass changes in three directions were obtained. Then, these changes were compared between the experimental and control groups using independent and paired t-test at 95% confidence level. The results showed that the displacement of the center of mass in all three directions was significantly higher for people with different leg length differences when comparing with healthy people (p<0.05). The results also showed that range of movement has no significant different in the Vertical axis between normal and LLD people (p>0.05) when using insole. Based on the findings of this study, it can be concluded that the use of compensatory insoles alone cannot make changes in the center of mass as one of the indicators to measure the balance in climbing stairs like normal people.

کلیدواژه‌ها English

Leg Length Discrepancy
Compensatory Insoles
Center of Mass
Stair
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نشریه علمی مهندسی پزشکی زیستی
دوره 15، شماره 2
تابستان 1400
صفحه 141-150

  • تاریخ دریافت 18 اردیبهشت 1400
  • تاریخ بازنگری 23 خرداد 1400
  • تاریخ پذیرش 25 خرداد 1400

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