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introduction to the field of biomechanics which is the study of human movement by using mechanical physics to analyze the effects to human body.
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Biomechanics IBiomechanics I 11
What is biomechanics?What is biomechanics?
Application of Application of
mechanical mechanical principlesprinciples
in the study ofin the study of
living organismsliving organisms
Biomechanics IBiomechanics I 22
Biomechnaics = Bio + Mechanics
BioBioliving organismsliving organisms
MechanicsMechanicsthe study of the action of forces on the study of the action of forces on particles and mechanical systems; particles and mechanical systems; a branch of physicsa branch of physics
Biomechanics IBiomechanics I 33
Sub-branches of Sub-branches of biomechanicsbiomechanics
kinematics:kinematics: study of the study of the appearance or description of appearance or description of motionmotion
kinetics:kinetics: study of the actions of study of the actions of forcesforces
Biomechanics IBiomechanics I 44
Sub-branches of Sub-branches of biomechanicsbiomechanics
statics:statics: study of systems in study of systems in
constant motionconstant motion
dynamics:dynamics: study of systems study of systems
subject to accelerationsubject to acceleration
Biomechanics IBiomechanics I 77
Main Themes in Main Themes in BiomechanicsBiomechanics
SafetySafety: Prevention of injury : Prevention of injury
EffectivenessEffectiveness: maximization of the : maximization of the
output output
EfficiencyEfficiency: economy of energy : economy of energy
expenditureexpenditure
Biomechanics IBiomechanics I 88
What is Biomechanics used for?What is Biomechanics used for?
Improving Sports PerformanceImproving Sports Performance
– – Better techniqueBetter technique
– – Better equipment (Better equipment (e.g. e.g. klapskates)klapskates) Sports Injury PreventionSports Injury Prevention
– – Identifying safer techniquesIdentifying safer techniques
– – Developing protective equipment Developing protective equipment
((e.g. e.g. ankle brace)ankle brace)
Biomechanics IBiomechanics I 99
What is Biomechanics used for?What is Biomechanics used for?
Occupational Injury Prevention Occupational Injury Prevention
– – ((e.g. e.g. low back pain, hand & wrist low back pain, hand & wrist trauma)trauma)
Injury RehabilitationInjury Rehabilitation
– – Identify when safe to return to Identify when safe to return to activityactivity Improving MobilityImproving Mobility
– – ((e.g. e.g. surgery planning in cerebral palsy)surgery planning in cerebral palsy)
Biomechanics IBiomechanics I 1010
What is Biomechanics used for?What is Biomechanics used for?
Reducing Physical or Functional DeclinesReducing Physical or Functional Declines
– – ((e.g. e.g. reducing injurious falls in olderreducing injurious falls in older
adults; preventing bone loss in olderadults; preventing bone loss in older
space)space)
• • Product DesignProduct Design
– – ((e.g. e.g. athletic shoes, prosthetics, athletic shoes, prosthetics,
artificial joints)artificial joints)
Biomechanics IBiomechanics I 1111
Study of Biomechanics’ Study of Biomechanics’ problemproblem
Biomechanics IBiomechanics I 1212
qualitative:qualitative: pertaining to pertaining to quality (without the use of quality (without the use of numbers)numbers)
quantitative:quantitative: involving involving numbersnumbersAnalysis Evaluation
/
Testing
Intervention
Performance
Biomechanics IBiomechanics I 1313
Directional TermsDirectional Terms
Anterior / posterior:Anterior / posterior: toward the toward the
front/back of the body front/back of the body
= ventral/dorsal= ventral/dorsal
Medial / lateral:Medial / lateral: toward/away toward/away
from the midline of the bodyfrom the midline of the body
Biomechanics IBiomechanics I 1414
Superior / inferior:Superior / inferior: closer/farther closer/farther
to/from the head = cranial/caudalto/from the head = cranial/caudal
Proximal / distal:Proximal / distal: closer/away to/from closer/away to/from
the trunkthe trunk
Superficial / deep:Superficial / deep: inside the body inside the body
and toward/away from the body surfaceand toward/away from the body surface
Directional TermsDirectional Terms
Biomechanics IBiomechanics I 1515
Anatomical Reference PositionAnatomical Reference Position erect standing erect standing
positionposition feet slightly feet slightly
separatedseparated and and pointed forwardpointed forward
arms hanging arms hanging relaxed at the sidesrelaxed at the sides
palms of hands palms of hands facing forwardfacing forward
Biomechanics IBiomechanics I 1616
Plane of MotionPlane of Motion
Plane: the imaginary flat surfaces Plane: the imaginary flat surfaces
that pass through the bodythat pass through the body
– Sagittal : side viewSagittal : side view
– Coronal (Frontal) : front and Coronal (Frontal) : front and
back viewback view
– Transverse (Horizontal) : top Transverse (Horizontal) : top
and bottom viewand bottom view
Biomechanics IBiomechanics I 1717
Biomechanics IBiomechanics I 1818
Axis of MotionAxis of Motion
• Axis : the imaginary or real line Axis : the imaginary or real line
around which movement takes around which movement takes
placeplace
– perpendicular to the plane of perpendicular to the plane of
movementmovement
– Medial-LateralMedial-Lateral
– Anterior-Posterior Anterior-Posterior
– Longitudinal Longitudinal
Biomechanics IBiomechanics I 1919
Planes and Axes of Planes and Axes of MotionMotion
PlanePlane AxisAxis MovementMovement
SagittalSagittal Medial-Medial-Lateral Lateral
Flexion / Extension
Dorsiflexion / Plantar Dorsiflexion / Plantar FlexionFlexion
Anterior / Posterior Pelvic Anterior / Posterior Pelvic TiltTilt
Frontal Frontal (Coronal)(Coronal)
Anterior-Anterior-PosteriorPosterior
Abduction / / Adduction
Lateral Flexion / Lateral Lateral Flexion / Lateral TiltTiltInversion / / Eversion
TransverseTransverse LongitudinalLongitudinal Internal / External Internal / External RotationRotationPronation / / Supination
Horizontal Abduction / Horizontal Abduction / AdductionAdduction
Biomechanics IBiomechanics I 2020
Movements can be defined Movements can be defined based on how they relate to the based on how they relate to the bodybody
Flexion / ExtensionFlexion / Extension
Abduction / AdductionAbduction / Adduction
Internal rotation / External Internal rotation / External rotationrotation
Plantarflexion / DorsiflexionPlantarflexion / Dorsiflexion
Biomechanics IBiomechanics I 2121
Biomechanics IBiomechanics I 2222
Motion of ObjectsMotion of Objects Linear motion (Translation):Linear motion (Translation): motion motion
in which a straight line drawn between 2 in which a straight line drawn between 2
or more points on the body maintain the or more points on the body maintain the
same direction during the movement same direction during the movement
(show the same trajectory (motion along (show the same trajectory (motion along
a line))a line))
All points along the line will move All points along the line will move
along the parallel pathsalong the parallel paths
Biomechanics IBiomechanics I 2323
Straight paths rectilinear Straight paths rectilinear motionmotion
Biomechanics IBiomechanics I 2424
Biomechanics IBiomechanics I 2525
Curved paths curvilinear motionCurved paths curvilinear motion
Biomechanics IBiomechanics I 2626
Biomechanics IBiomechanics I 2727
Angular motion (Rotation):Angular motion (Rotation): rotation rotation around a fixed axis has all points around a fixed axis has all points
on a rigid segment moving in on a rigid segment moving in parallel planes along circular paths parallel planes along circular paths
about the axisabout the axis
Biomechanics IBiomechanics I 2828
Biomechanics IBiomechanics I 2929
General MotionGeneral Motion - combination - combination of linear motion + angular of linear motion + angular
motionmotion
Biomechanics IBiomechanics I 3030
Biomechanics IBiomechanics I 3131
Motion of rigid bodyMotion of rigid body
All motions can be decomposed into All motions can be decomposed into the three translations and three the three translations and three rotationsrotations
For a motion to be categorized, the For a motion to be categorized, the following must be defined:following must be defined: Type of motion (linear or angular)Type of motion (linear or angular) The reference frameThe reference frame Degree of freedom (2D or 3D)Degree of freedom (2D or 3D)
Biomechanics IBiomechanics I 3232
2-D Reference Frame2-D Reference Frame
Biomechanics IBiomechanics I 3333
3-D Reference Frame3-D Reference Frame
Biomechanics IBiomechanics I 3434
Degrees of FreedomDegrees of Freedom
Biomechanics IBiomechanics I 3535
LeverageLeverageF R
First class
R F
Second class
F R
Third class