Evaluation of an external device measuring knee joint rotation: an in vivo study with simultaneous Roentgen stereometric analysis.
(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)
Please use this url to cite or link to this publication:
https://lup.lub.lu.se/record/108614
- author
- Almquist, Per Otto LU ; Arnbjörnsson, Arnbjörn ; Zätterström, Rose ; Ryd, Leif LU ; Ekdahl, Charlotte LU and Fridén, Thomas LU
- organization
- publishing date
- 2002
- 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 Inc.
- external identifiers
-
- wos:000175621300005
- pmid:12038614
- scopus:0036239109
- ISSN
- 1554-527X
- DOI
- 10.1016/S0736-0266(01)00148-6
- language
- English
- LU publication?
- yes
- additional info
- The information about affiliations in this record was updated in December 2015. The record was previously connected to the following departments: Division of Physiotherapy (Closed 2012) (013042000), Department of Orthopaedics (Lund) (013028000)
- id
- f8e48804-bf18-4a2a-9382-afcf9f85669b (old id 108614)
- date added to LUP
- 2016-04-01 11:51:43
- date last changed
- 2022-01-26 19:20:28
@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}}, keywords = {{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 Inc.}}, 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}}, doi = {{10.1016/S0736-0266(01)00148-6}}, volume = {{20}}, year = {{2002}}, }