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Measurements of knee rotation in vivo - Development and evaluation of an external device

Almquist, Per Otto LU (2012) In Lund University, Faculty of Medicine Doctoral Dissertation Series 2012:54.
Abstract
The overall aim of this work was to evaluate a newly developed measurement device,

the Rottometer, for measuring knee rotation in different flexion angles with different

applied torques, in order to establish the normal range of healthy knee rotation reference

values and to study possible differences due to age and gender, as well as possible

differences between patients with habitual dislocating patella (HDP) and healthy

controls. The validity of the Rottometer was evaluated by simultaneous registrations

with roentgen stereometric analysis (RSA) (paper I). The two methods showed high

correlations concerning the total knee rotation at 90° and 60° of knee flexion ... (More)
The overall aim of this work was to evaluate a newly developed measurement device,

the Rottometer, for measuring knee rotation in different flexion angles with different

applied torques, in order to establish the normal range of healthy knee rotation reference

values and to study possible differences due to age and gender, as well as possible

differences between patients with habitual dislocating patella (HDP) and healthy

controls. The validity of the Rottometer was evaluated by simultaneous registrations

with roentgen stereometric analysis (RSA) (paper I). The two methods showed high

correlations concerning the total knee rotation at 90° and 60° of knee flexion angles

with 3, 6 and 9 Nm applied torques. The Rottometer was also concluded to be a reliable

measurement device concerning the one-week-apart and within day intra-tester

as well as the inter-tester reliability at 90°, 60° and 30° with 6 and 9 Nm as well as the

examiner’s apprehension of end-feel (paper II). In total, 120 knee healthy subjects (60

females and 60 males) equally distributed in four different age groups (15-30, 31-45,

46-60 and ≥ 61 years) were examined at 90°, 60° and 30° of knee flexion angles with

6 and 9 Nm applied torques as well as the examiner’s apprehension of end-feel (paper

III). No differences were found concerning the different flexion angles, between the left

and right knee or between the different age groups within the genders. However, the

females showed a 10-20 % larger range of knee rotation than the males at all different

flexion angles and applied torques. The knee rotation was also examined in 20 patients

(15 females and 5 males) with HDP (paper IV). No differences were found between

the affected and unaffected knees within the subjects. In accordance with the healthy

reference population, the female subjects showed a 10-20 % significantly larger range

of rotation than the male subjects in the HDP group, and no differences were found

between the patients affected with HDP and age matched healthy controls. (Less)
Please use this url to cite or link to this publication:
author
supervisor
opponent
  • docent Kvist, Joanna, Inst för medicin och hälsa, avd för sjukgymnastik, Linköpings Universitet
organization
publishing date
type
Thesis
publication status
published
subject
keywords
Knee, rotation, measurement, evaluation, gender, age, dislocating patella
in
Lund University, Faculty of Medicine Doctoral Dissertation Series
volume
2012:54
pages
90 pages
publisher
Department of Health Sciences, Lund University
defense location
Health Sciences Centre, Hörsal 01
defense date
2012-10-26 09:00
ISSN
1652-8220
ISBN
978-91-87189-17-3
language
English
LU publication?
yes
id
8f05547d-ebd4-414a-9661-77bb5b82f688 (old id 3127987)
date added to LUP
2012-10-10 09:04:58
date last changed
2016-09-19 08:44:47
@phdthesis{8f05547d-ebd4-414a-9661-77bb5b82f688,
  abstract     = {The overall aim of this work was to evaluate a newly developed measurement device,<br/><br>
the Rottometer, for measuring knee rotation in different flexion angles with different<br/><br>
applied torques, in order to establish the normal range of healthy knee rotation reference<br/><br>
values and to study possible differences due to age and gender, as well as possible<br/><br>
differences between patients with habitual dislocating patella (HDP) and healthy<br/><br>
controls. The validity of the Rottometer was evaluated by simultaneous registrations<br/><br>
with roentgen stereometric analysis (RSA) (paper I). The two methods showed high<br/><br>
correlations concerning the total knee rotation at 90° and 60° of knee flexion angles<br/><br>
with 3, 6 and 9 Nm applied torques. The Rottometer was also concluded to be a reliable<br/><br>
measurement device concerning the one-week-apart and within day intra-tester<br/><br>
as well as the inter-tester reliability at 90°, 60° and 30° with 6 and 9 Nm as well as the<br/><br>
examiner’s apprehension of end-feel (paper II). In total, 120 knee healthy subjects (60<br/><br>
females and 60 males) equally distributed in four different age groups (15-30, 31-45,<br/><br>
46-60 and ≥ 61 years) were examined at 90°, 60° and 30° of knee flexion angles with<br/><br>
6 and 9 Nm applied torques as well as the examiner’s apprehension of end-feel (paper<br/><br>
III). No differences were found concerning the different flexion angles, between the left<br/><br>
and right knee or between the different age groups within the genders. However, the<br/><br>
females showed a 10-20 % larger range of knee rotation than the males at all different<br/><br>
flexion angles and applied torques. The knee rotation was also examined in 20 patients<br/><br>
(15 females and 5 males) with HDP (paper IV). No differences were found between<br/><br>
the affected and unaffected knees within the subjects. In accordance with the healthy<br/><br>
reference population, the female subjects showed a 10-20 % significantly larger range<br/><br>
of rotation than the male subjects in the HDP group, and no differences were found<br/><br>
between the patients affected with HDP and age matched healthy controls.},
  author       = {Almquist, Per Otto},
  isbn         = {978-91-87189-17-3},
  issn         = {1652-8220},
  keyword      = {Knee,rotation,measurement,evaluation,gender,age,dislocating patella},
  language     = {eng},
  pages        = {90},
  publisher    = {Department of Health Sciences, Lund University},
  school       = {Lund University},
  series       = {Lund University, Faculty of Medicine Doctoral Dissertation Series},
  title        = {Measurements of knee rotation in vivo - Development and evaluation of an external device},
  volume       = {2012:54},
  year         = {2012},
}