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Evaluation of an external device measuring knee joint rotation: an in vivo study with simultaneous Roentgen stereometric analysis.

Almquist, Per Otto LU ; Arnbjörnsson, Arnbjörn; Zätterström, Rose; Ryd, Leif LU ; Ekdahl, Charlotte LU and Fridén, Thomas LU (2002) In Journal of Orthopaedic Research 20(3). p.427-432
Abstract
An external device ("rottometer") specially designed to measure knee joint rotation was developed and evaluated with respect to its validity. Simultaneous measurements were made with the rottometer and Roentgen stereometric analysis (RSA) in five patients with implanted tantalum markers in the tibia and femur. Measurements of internal and external rotation were made at 90 degrees and 60 degrees of knee flexion using 3, 6 and 9 N m torques. The coefficients of determination (r2) between the results obtained with the rottometer and RSA were around 0.9 for the total rotation. The rottometer consistently overestimated the rotation by about 100% and this systematic error was most constant at 90 degrees flexion for the different torques. The... (More)
An external device ("rottometer") specially designed to measure knee joint rotation was developed and evaluated with respect to its validity. Simultaneous measurements were made with the rottometer and Roentgen stereometric analysis (RSA) in five patients with implanted tantalum markers in the tibia and femur. Measurements of internal and external rotation were made at 90 degrees and 60 degrees of knee flexion using 3, 6 and 9 N m torques. The coefficients of determination (r2) between the results obtained with the rottometer and RSA were around 0.9 for the total rotation. The rottometer consistently overestimated the rotation by about 100% and this systematic error was most constant at 90 degrees flexion for the different torques. The magnitude of this error from soft tissue deformation as well as the rotatory movements in the hip, foot and ankle joints must be considered when using external devices to measure knee rotation in clinical studies. The most accurate registrations were found in 90 degrees flexion with 9 N m force (r2 = 0.94). (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Arthrography, Equipment and Supplies, Human, Knee Joint : physiopathology, Knee Joint : radiography, Range of Motion, Male, Articular, Rotation, Equipment Design
in
Journal of Orthopaedic Research
volume
20
issue
3
pages
427 - 432
publisher
John Wiley & Sons
external identifiers
  • wos:000175621300005
  • pmid:12038614
  • scopus:0036239109
ISSN
1554-527X
DOI
10.1016/S0736-0266(01)00148-6
language
English
LU publication?
yes
id
f8e48804-bf18-4a2a-9382-afcf9f85669b (old id 108614)
date added to LUP
2007-07-24 09:32:44
date last changed
2017-12-10 03:43:34
@article{f8e48804-bf18-4a2a-9382-afcf9f85669b,
  abstract     = {An external device ("rottometer") specially designed to measure knee joint rotation was developed and evaluated with respect to its validity. Simultaneous measurements were made with the rottometer and Roentgen stereometric analysis (RSA) in five patients with implanted tantalum markers in the tibia and femur. Measurements of internal and external rotation were made at 90 degrees and 60 degrees of knee flexion using 3, 6 and 9 N m torques. The coefficients of determination (r2) between the results obtained with the rottometer and RSA were around 0.9 for the total rotation. The rottometer consistently overestimated the rotation by about 100% and this systematic error was most constant at 90 degrees flexion for the different torques. The magnitude of this error from soft tissue deformation as well as the rotatory movements in the hip, foot and ankle joints must be considered when using external devices to measure knee rotation in clinical studies. The most accurate registrations were found in 90 degrees flexion with 9 N m force (r2 = 0.94).},
  author       = {Almquist, Per Otto and Arnbjörnsson, Arnbjörn and Zätterström, Rose and Ryd, Leif and Ekdahl, Charlotte and Fridén, Thomas},
  issn         = {1554-527X},
  keyword      = {Arthrography,Equipment and Supplies,Human,Knee Joint : physiopathology,Knee Joint : radiography,Range of Motion,Male,Articular,Rotation,Equipment Design},
  language     = {eng},
  number       = {3},
  pages        = {427--432},
  publisher    = {John Wiley & Sons},
  series       = {Journal of Orthopaedic Research},
  title        = {Evaluation of an external device measuring knee joint rotation: an in vivo study with simultaneous Roentgen stereometric analysis.},
  url          = {http://dx.doi.org/10.1016/S0736-0266(01)00148-6},
  volume       = {20},
  year         = {2002},
}