کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
10431021 910194 2016 8 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Damage in total knee replacements from mechanical overload
ترجمه فارسی عنوان
خسارت در کل زانو جایگزین از اضافه بار مکانیکی
موضوعات مرتبط
مهندسی و علوم پایه سایر رشته های مهندسی مهندسی پزشکی
چکیده انگلیسی
The mechanical loads acting across the knee joint following total knee replacements (TKR) during activities of daily living have recently been measured using instrumented TKRs. Using a series of postmortem retrieved TKR constructs we investigated whether these mechanical loads could result in damage to the implant bone interface or supporting bone in the tibia. Eighteen cemented en bloc tibial components (0 to 22 years in service) were loaded under axial compression in increments from 1 to 10 times body weight and digital image correlation was used to measure bone strain and interface micromotion during loading and unloading. Failure was considered to occur when micromotion exceeded 150 µm or compressive bone strain exceeded 7300 με. The results show that all retrieved specimens had sufficient bone strength to support most activities of daily living, but ~40% would be at risk under larger physiologic loads that might occur secondary to a higher impacts such as jogging or a stumble. The tray-bone micromotion (regression model R2=0.48, p=0.025) was greater for donors with lower age at implantation (p=0.0092). Proximal bone strain (model R2=0.46, p=0.03) was greater for donors with longer time in service (p=0.021). Distal bone strain (model R2=0.58, p=0.005) was greater for donors with more time in service (p=0.0054) and lower peri-implant BMD (p=0.049). High mechanical overload of a single or repetitive nature may be an initiating factor in aseptic loosening of total joint arthroplasties and should be avoided in order to prolong the life of the implant.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Biomechanics - Volume 49, Issue 10, 5 July 2016, Pages 2068-2075
نویسندگان
, , , , ,