کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
6211323 1267213 2014 6 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Quantitative measurement of lower limb mechanical alignment and coronal knee laxity in early flexion
ترجمه فارسی عنوان
اندازه گیری کمی ترمزی مکانیک اندام و زانوی کرونال در زانوی اولیه
کلمات کلیدی
هماهنگی مکانیکی، غیر تهاجمی سقط مکرر، آرتروپلاستی کامل زانو، ناوبری تصویری رایگان،
موضوعات مرتبط
علوم پزشکی و سلامت پزشکی و دندانپزشکی ارتوپدی، پزشکی ورزشی و توانبخشی
چکیده انگلیسی


- Cadaveric validation of invasive vs non-invasive navigation measuring limb alignment.
- Non-invasive method as precise and accurate from extension to 50° knee flexion.
- Increasing flexion > 50° adversely affects precision of non-invasive method.
- Invasive method precision not affected by flexion.
- Non-invasive navigation can be used in an out-patient clinic setting.

BackgroundNon-invasive quantification of lower limb alignment using navigation technology is now possible throughout knee flexion owing to software developments. We report the precision and accuracy of a non-invasive system measuring mechanical alignment of the lower limb including coronal stress testing of the knee.MethodsTwelve cadaveric limbs were tested with a commercial invasive navigation system against the non-invasive system. Coronal mechanical femorotibial (MFT) alignment was measured with no stress, then 15 Nm varus and valgus applied moments. Measurements were recorded at 10° intervals from extension to 90° flexion. At each flexion interval, coefficient of repeatability (CR) tested precision within each system, and limits of agreement (LOA) tested agreement between the two systems. Limits for CR & LOA were set at 3° based on requirements for surgical planning and evaluation.ResultsPrecision was acceptable throughout flexion in all conditions of stress using the invasive system (CR ≤ 1.9°). Precision was acceptable using the non-invasive system from extension to 50° flexion (CR ≤ 2.4°), beyond which precision was unacceptable (> 3.4°). With no coronal stress applied, agreement remained acceptable from extension to 40° (LOA ≤ 2.4°), and when 15 Nm varus or valgus stress was applied agreement was acceptable from extension to 30° (LOA ≤ 2.9°). Higher angles of knee flexion had a negative impact on precision and accuracy.Conclusion & clinical relevanceThe non-invasive system provides reliable quantitative data in-vitro on coronal MFT alignment and laxity in the range relevant to assessment of collateral ligament injury, pre-operative planning of arthroplasty and flexion instability following arthroplasty. In-vivo validation should be performed.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: The Knee - Volume 21, Issue 6, December 2014, Pages 1063-1068
نویسندگان
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