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Measurements of knee rotation-reliability of an external device in vivo.

Almquist, Per O; Ekdahl, Charlotte LU ; Isberg, Per-Erik and Fridén, Thomas (2011) In BMC Musculoskeletal Disorders 12.
Abstract
BACKGROUND:

Knee rotation plays an important part in knee kinematics during weight-bearing activities. An external device for measuring knee rotation (the Rottometer) has previously been evaluated for validity by simultaneous measurements of skeletal movements with Roentgen Stereometric Analysis (RSA). The aim of this study was to investigate the reliability of the device.



METHOD:

The within-day and test-retest reliability as well as intertester reliability of the device in vivo was calculated. Torques of 3, 6 and 9 Nm and the examiner's apprehension of end-feel were used at 90°, 60° and 30° of knee flexion. Intraclass Correlation Coefficient 2,1 (ICC 2,1), 95% confidence interval (CI) of ICC and 95% CI... (More)
BACKGROUND:

Knee rotation plays an important part in knee kinematics during weight-bearing activities. An external device for measuring knee rotation (the Rottometer) has previously been evaluated for validity by simultaneous measurements of skeletal movements with Roentgen Stereometric Analysis (RSA). The aim of this study was to investigate the reliability of the device.



METHOD:

The within-day and test-retest reliability as well as intertester reliability of the device in vivo was calculated. Torques of 3, 6 and 9 Nm and the examiner's apprehension of end-feel were used at 90°, 60° and 30° of knee flexion. Intraclass Correlation Coefficient 2,1 (ICC 2,1), 95% confidence interval (CI) of ICC and 95% CI between test trials and examiners were used as statistical tests.



RESULT:

ICC2,1 ranged from 0.50 to 0.94 at all three flexion angles at 6 and 9 Nm as well as end-feel, and from 0.22 to 0.75 at 3 Nm applied torque.



CONCLUSION:

The Rottometer was a reliable measurement instrument concerning knee rotation at the three different flexion angles (90°, 60° and 30°) with 6 and 9 Nm applied torques as well as the examiner's apprehension of end-feel. Three Nm was not a reliable torque. The most reliable measurements were made at 9 Nm applied torque. (Less)
Please use this url to cite or link to this publication:
author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
BMC Musculoskeletal Disorders
volume
12
publisher
BioMed Central
external identifiers
  • wos:000300175700001
  • pmid:22208736
  • scopus:84855182607
ISSN
1471-2474
DOI
10.1186/1471-2474-12-291
language
English
LU publication?
yes
id
9a12af85-a6f5-41ec-9281-0b00e615c15e (old id 2336813)
alternative location
http://www.ncbi.nlm.nih.gov/pubmed/22208736?dopt=Abstract
date added to LUP
2012-02-01 18:45:58
date last changed
2017-08-06 04:19:19
@article{9a12af85-a6f5-41ec-9281-0b00e615c15e,
  abstract     = {BACKGROUND:<br/><br>
Knee rotation plays an important part in knee kinematics during weight-bearing activities. An external device for measuring knee rotation (the Rottometer) has previously been evaluated for validity by simultaneous measurements of skeletal movements with Roentgen Stereometric Analysis (RSA). The aim of this study was to investigate the reliability of the device.<br/><br>
<br/><br>
METHOD:<br/><br>
The within-day and test-retest reliability as well as intertester reliability of the device in vivo was calculated. Torques of 3, 6 and 9 Nm and the examiner's apprehension of end-feel were used at 90°, 60° and 30° of knee flexion. Intraclass Correlation Coefficient 2,1 (ICC 2,1), 95% confidence interval (CI) of ICC and 95% CI between test trials and examiners were used as statistical tests.<br/><br>
<br/><br>
RESULT:<br/><br>
ICC2,1 ranged from 0.50 to 0.94 at all three flexion angles at 6 and 9 Nm as well as end-feel, and from 0.22 to 0.75 at 3 Nm applied torque.<br/><br>
<br/><br>
CONCLUSION:<br/><br>
The Rottometer was a reliable measurement instrument concerning knee rotation at the three different flexion angles (90°, 60° and 30°) with 6 and 9 Nm applied torques as well as the examiner's apprehension of end-feel. Three Nm was not a reliable torque. The most reliable measurements were made at 9 Nm applied torque.},
  articleno    = {291},
  author       = {Almquist, Per O and Ekdahl, Charlotte and Isberg, Per-Erik and Fridén, Thomas},
  issn         = {1471-2474},
  language     = {eng},
  publisher    = {BioMed Central},
  series       = {BMC Musculoskeletal Disorders},
  title        = {Measurements of knee rotation-reliability of an external device in vivo.},
  url          = {http://dx.doi.org/10.1186/1471-2474-12-291},
  volume       = {12},
  year         = {2011},
}