Rotační laxita kolenního kloubu - in vivo NMR studie

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00064211%3A_____%2F19%3AW0002025" target="_blank" >RIV/00064211:_____/19:W0002025 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/00216208:11110/19:10398437 RIV/00064203:_____/19:10398437 RIV/00064165:_____/19:10398437

Výsledek na webu

<a href="http://www.achot.cz/dwnld/achot_2019_4_249_255.pdf" target="_blank" >http://www.achot.cz/dwnld/achot_2019_4_249_255.pdf</a>

DOI - Digital Object Identifier

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Jazyk výsledku

čeština

Název v původním jazyce

Rotační laxita kolenního kloubu - in vivo NMR studie

Popis výsledku v původním jazyce

PURPOSE OF THE STUDY The purpose of the study was to evaluate tibio-femoral rotation during a simulated squat and to investigate the relationship between the rotational position of the femur in full extension and the amount of external rotation of the femur on the tibia during flexion.

Název v anglickém jazyce

Rotational Laxity of the Knee Joint - In Vivo MRI Study

Popis výsledku anglicky

PURPOSE OF THE STUDY The purpose of the study was to evaluate tibio-femoral rotation during a simulated squat and to investigate the relationship between the rotational position of the femur in full extension and the amount of external rotation of the femur on the tibia during flexion. MATERIAL AND METHODS Part 1: MRIs of volunteers Data on healthy knees of 10 volunteers were obtained using 2D MRI measurements. The foot and the ankle were fixed to prevent rotation and adduction/abduction movements. Sagittal MRIs of the knees have been performed in 4 positions of flexion. The amount of longitudinal rotation in each position of flexion was calculated. Part 2: Mathematical model experiment a) The model of the femur has been positioned in the 3D coordinate system in full extension and at 12.8 degrees of internal rotation and then flexed to 90 degrees without longitudinal rotation. The distance between the centre of the femoral head and the sagittal plane passing through the centre of the knee was then measured. b) Subsequently, the femur was flexed and rotation allowed to retain femoral head within the sagittal plane. The amount of femoral rotation was then calculated. RESULTS Part 1: In full extension the femur was on average in 12.8 degrees of IR relative to the tibia. By 90 degrees flexion femur rotated on average 12.2 degrees externally. Part 2: a) From full extension to 90 degrees flexion the femoral head moved 93.1 mm laterally from the sagittal plane. b) Between full extension and 90 degrees flexion the femur rotated 12.8 degrees externally, a degree which corresponds to the amount of initial internal rotation of the femur in full extension. DISCUSSION The most important finding of the presented in vivo study lies in the fact that in normal knees with tibia rotationally fixed flexion is always coupled with femoral external rotation in order to keep the femoral head in the acetabulum. This rotation is obligatory. CONCLUSIONS We have demonstrated that if the tibia is rotationally fixed, the knee flexion is possible only when accompanied by femoral external rotation to keep the femoral head in the acetabulum. A mathematical description of the experiment has been proposed, the results of which confirm the stated premise. This finding can be explained by initial internal rotation of the femur in full extension of the knee and is allowed by the shape of articulating bones and tension of soft tissues.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

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OECD FORD obor

30211 - Orthopaedics

Projekt

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Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2019

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

ACTA CHIRURGIAE ORTHOPAEDICAE ET TRAUMATOLOGIAE CECHOSLOVACA

ISSN

0001-5415

e-ISSN

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Svazek periodika

86

Číslo periodika v rámci svazku

4

Stát vydavatele periodika

CZ - Česká republika

Počet stran výsledku

7

Strana od-do

249-255

Kód UT WoS článku

000483007800002

EID výsledku v databázi Scopus

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