There is one other study that I am aware of re pelvic bone deformation. An interesting consideration re the felt experience of springing with awareness.
Mean range of 3D deformation of the innominate bone (3.39 ±2.92
mm) is comparable to the range of symphysis motion (3.20 ± 2.58 mm; p >
0.05). Largest deformation within the innominate was present in the transverse
plane (1.41 ± 3.1 mm). Significant differences (p < 0.01) occured in the
mobility of the pubic symphysis between male and female specimens. No
significant gender differences were present in the deformation of the
innominate bone.
Pool-Goudzwaard A, Gnat R, Spoor K. Deformation of the innominate
bone and mobility of the pubic symphysis during asymmetric moment application to
the pelvis. Man Ther. 2012 Feb;17(1):66-70. Epub 2011 Oct
20.
Source
Department of Neuroscience, Faculty of Medicine and Health
Sciences, Erasmus MC University, Rotterdam, The Netherlands.
a.goudzwaard@erasmusmc.nl
Abstract
BACKGROUND:
Angular motions of human joints are frequently accompanied by
bony deformations. In the case of the pelvis it is unknown how much deformation
within the innominate and movement within pelvic joints will occur during an
asymmetrical loading. Deeper insight into this topic could help to increase the
understanding of the biomechanics of the pelvis during e.g. locomotion and
improve interpretation of clinical tests in which manual force is asymmetrically
applied to the pelvic bones.
OBJECTIVE:
To test the occurrence of deformation within the innominate and
movement within the pubic symphysis during asymmetric moment application to the
pelvis.
METHODS:
In 15 embalmed specimens an incremental moment was applied to one
innominate bone in the sagittal plane with respect to the fixated contralateral
innominate. The three-dimensional (3D) deformation within the fixated
innominate, as well as displacement of the pubic symphysis, were described
during each increment of the moment. Maximal amount of deformation within the
fixated innominate was compared with displacement in the pubic symphysis and
tested for significant difference for all subjects and separately by
gender.
RESULTS:
Mean range of 3D deformation of the innominate bone (3.39 ±2.92
mm) is comparable to the range of symphysis motion (3.20 ± 2.58 mm; p >
0.05). Largest deformation within the innominate was present in the transverse
plane (1.41 ± 3.1 mm). Significant differences (p < 0.01) occured in the
mobility of the pubic symphysis between male and female specimens. No
significant gender differences were present in the deformation of the
innominate bone.
CONCLUSIONS:
During asymmetrical loading both movement within the pubic
symphysis as well as deformation within the innominate occur simultaneously.
Deformation of the innominate is the largest in the transverse
plane.
Mean range of 3D deformation of the innominate bone (3.39 ±2.92
mm) is comparable to the range of symphysis motion (3.20 ± 2.58 mm; p >
0.05). Largest deformation within the innominate was present in the transverse
plane (1.41 ± 3.1 mm). Significant differences (p < 0.01) occured in the
mobility of the pubic symphysis between male and female specimens. No
significant gender differences were present in the deformation of the
innominate bone.
Pool-Goudzwaard A, Gnat R, Spoor K. Deformation of the innominate
bone and mobility of the pubic symphysis during asymmetric moment application to
the pelvis. Man Ther. 2012 Feb;17(1):66-70. Epub 2011 Oct
20.
Source
Department of Neuroscience, Faculty of Medicine and Health
Sciences, Erasmus MC University, Rotterdam, The Netherlands.
a.goudzwaard@erasmusmc.nl
Abstract
BACKGROUND:
Angular motions of human joints are frequently accompanied by
bony deformations. In the case of the pelvis it is unknown how much deformation
within the innominate and movement within pelvic joints will occur during an
asymmetrical loading. Deeper insight into this topic could help to increase the
understanding of the biomechanics of the pelvis during e.g. locomotion and
improve interpretation of clinical tests in which manual force is asymmetrically
applied to the pelvic bones.
OBJECTIVE:
To test the occurrence of deformation within the innominate and
movement within the pubic symphysis during asymmetric moment application to the
pelvis.
METHODS:
In 15 embalmed specimens an incremental moment was applied to one
innominate bone in the sagittal plane with respect to the fixated contralateral
innominate. The three-dimensional (3D) deformation within the fixated
innominate, as well as displacement of the pubic symphysis, were described
during each increment of the moment. Maximal amount of deformation within the
fixated innominate was compared with displacement in the pubic symphysis and
tested for significant difference for all subjects and separately by
gender.
RESULTS:
Mean range of 3D deformation of the innominate bone (3.39 ±2.92
mm) is comparable to the range of symphysis motion (3.20 ± 2.58 mm; p >
0.05). Largest deformation within the innominate was present in the transverse
plane (1.41 ± 3.1 mm). Significant differences (p < 0.01) occured in the
mobility of the pubic symphysis between male and female specimens. No
significant gender differences were present in the deformation of the
innominate bone.
CONCLUSIONS:
During asymmetrical loading both movement within the pubic
symphysis as well as deformation within the innominate occur simultaneously.
Deformation of the innominate is the largest in the transverse
plane.
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