3. CONTENT
INTRODUCTION
GAIT ANALYSIS
PROCESS AND EQUIPMENT
FACTORS AND PARAMETERS
TECHNIQUES
:- TEMPORAL/ SPATIAL
:- KINEMATICS AND KINETICS
:- DYNAMIC ELECTROMYOGRAPHY
APPLICATIONS
:- MEDICAL DIAGNOSTICS
:- PURPOSE FOR GAIT ANALYSIS
POSTURAL BALANCE
PRIMARY MUSCLE ACTIONS DURING GAIT
4. INTRODUCTION
SAGITTAL PLANE
SAGITTAL plane analysis of
gait or kinematic gait analysis
in the Sagittal plane is used
for clinical and laboratory
identification of deviations of
normal gait
The Sagittal plane divides the
body into left and right
Extension and flexion happen
along the sagittal plane
5. SAGITTAL PLANE ANALYSIS OF GAIT
When we move along this
plane, we are using the strength
of our muscles to move parts of
the body forward or backward
Flexion and extension occur in
this plane
Example:- Running, walking,
jumping , squatting, kicking a
football ,chest pass in netball,
lifting movements make use of
this plane
6. IN order to conduct a “SAGITTAL PLANE ANALYSIS OF GAIT”
we should firstly learn about the normal gait cycle
NORMAL GAIT CYCLE
(STANCE phase occupies 60% and SWING phase occupies 40%)
8. GAIT ANALYSIS
GAIT :- Manner, pattern or style of walking or
way of walking
GAIT ANALYSIS :-is the study of human motion
:- Using the eye and the brain of observer
:- Augmented by instrumentation
For Measuring
- Body movements
- Body mechanics
- Activity of muscles
9. The analysis of the Gait cycle is important in the
Biomechanical mobility
For analysis of gait cycle we can used
Subjective and Objective Methods
FUNCTION DIVISIONS OF THE GAIT CYCLE (GAIT
ANALYSIS)
10. Gait initiation (GI) involves the shifting of body weight
from double limb support during quiet standing (QS) to a
single limb, moving the body forward while controlling
frontal and sagittal plane forces as the body transitions to
steady-state gait whereby the center of mass (COM)
velocity is relatively constant.
With the feet side-by-side prior to GI, the initial intended
swing limb is unable to develop ‘push-off’ energy
normally seen in steady-state gait.
Thus, energy for the first step must come from other
sources, including passive gravitational forward lean and
active hip flexor contraction to pull the swing leg forward
As opposed to the predominately sagittal motion of
steady-state gait, GI begins with the lateral shifting of the
COM, which cannot be too lateral or too fast as this may
result in a loss of balance, possibly leading to a fall
11. From a neuromuscular perspective, when a subject commits to
begin walking, soleus activity is inhibited followed
immediately by activation of the tibialis anterior of both legs,
which allows the center of pressure (COP) to move backward
Concurrently, hip abductors are inhibited on the initial stance
limb and activated on the ipsilateral limb, such that the COP
shifts briefly towards the stance limb
Paradoxically, this pattern results in the initial swing limb
being loaded momentarily while the contralateral limb is
unloaded, the intention of which is to allow the COP to
accelerate the COM toward the contralateral limb. This results
in unloading the initial swing limb so that the first step of GI
may take place
Subsequently, the COP is driven medially during stance limb
loading, and forward along the stance foot as the swing limb is
lifted upward and forward
During the first step of GI, hip abductors of the stance limb act
to prevent the pelvis from dropping on the side of the intended
swing limb
12. The principle of the overall support moment, i.e., the
algebraic summation of sagittal plane lower extremity
joint extensor moments of force during gait (Winter,
1980).
The principle was based on the concept that the central
nervous system (CNS) does not simply control individual
joint moments of force; rather, the entire lower extremity
acts as a single unit with respect to support against gravity,
particularly during the single support phase of gait where
the collapse of the limb would be disastrous. The support
moment allows the CNS considerable flexibility in
adapting joint motion patterns of the lower extremity hip
and knee moments, depending upon such circumstances
as pain avoidance, changes in terrain, speed, aging, and so
forth.
13. Joint Power and Mechanical Energy in Gait
Initiation
From the perspective mechanical energy, GI has been
described as the the changing of the body’s energy
state from primarily potential energy during QS to the
states of both kinetic and potential energy during the
first three steps (Miller and Verstraete, 1999).
Previous energy analyses of GI have considered
segmental components and total body energy
throughout each step calculated from anthropometric
and kinematic data
However, for individuals with neurological conditions
such as multiple sclerosis or Parkinson’s disease,
movement transition states such as GI present unique
neuromuscular control challenges.
14. Hypotheses
The sagittal plane support moment would be like that
previously reported and would be evident following the
first step.
There would be a differentiation in the roles of the
sagittal and frontal planes support moment,
respectively.
Sagittal powers would have little contribution during
the initial transfer of weight in the stance phase of the
first step.
The energies in the sagittal plane would be significantly
larger than those of the frontal plane particularly for the
hip in the first step forward.
By the third step of GI, all kinetic variables would be like
those seen in steady-state gait.
15. : Schematic of the gait initiation protocol - FPn = force platform n. +Y = AP
direction, +X = ML direction B: Time-normalization schema - DS = double
support, SwL = swing leg, StL = stance leg
16. SAGITTAL PLANE DATA
To facilitate understanding the natural sequence of GI, STEP1 and
STEP3 are plotted continuously (left leg) with STEP2 (right leg)
plotted underneath for each joint in each plane. Vertical dotted
lines show the
17. Sagittal plane
The typical support moment pattern, i.e., predominately
extensors during stance and zero during swing, seen in
steady-state gait was not evident in STEP1.
During STEP2, there was a gradual increase in
magnitude during the stance phase of the support
moment as the COM began to move away from the
starting point.
By STEP3, there was positive (extensor) activity during
stance and slightly negative or zero support moment
during swing, which was more or less typical (Winter,
1980).
At the lower extremity joints, the magnitudes of the
moments in STEP1 were relatively small, with most of the
activity occurring in STEP2 and STEP3 at the ankle.
Typical support moment patterns at the hip and knee
were not evident until STEP3.
18. Sagittal Plane Energy
There were no sagittal plane energy data for the knee joint
during STEP1. Ankle energy absorption (A1) was present in all
three steps and modified as a function of the step number
(F(2,42) = 36.27, p < 0.0001): A1 progressively increased in
magnitude with each step. Ankle push-off (A2) was also present
in all three steps, and modified as a function of the step number
(F(2,42) = 68.27, p < 0.0001): A2 was lowest in STEP1, highest
in STEP2, and all steps were different from each other.
At the knee, no knee energy bursts were apparent in STEP1, K2
and K4 appeared in STEP2, while STEP3 contained K2, K3 and
K4. Therefore, at the knee, steady state gait patterns were
achieved progressively with each step. Comparisons across the
latter two steps demonstrated that only K4 was different
(F(1,28) = 5.50, p = 0.026), with STEP3 larger than STEP2.
At the hip, only hip pull-off (H3) was apparent at the toe-off in
STEP1. Additional energy bursts became apparent as steps
progressed: H1 was added at STEP2, and H2 was added at
STEP3. H1 was significantly greater in STEP3 compared to
STEP2 (F(1,26) = 10.44, p = 0.0033). Hip pull-off (H3) was not
different across the different steps (F(2,42) = 2.32, p = 0.11
19. PROCESS AND EQUIPMENT
Subjective and Objective Methods can be used to assess
the Gait cycle
SUBJECTIVE:-
:1- Different Gait patterns-
-Ask the patient to Walk normally
-On inside and outside of the feet in a straight line
-Running call the time looking to compare side
and understanding of normal
2- Ask/observe:-
-the type of footwear the patient uses
-Shoes affect Velocity, Step time and Step length
in younger children’s gait
20. Objective
1- QUANTITATIVE & PARAMETERS LIKE
time, distance & muscle activity will be measured
Other objective methods to assess the gait cycle
that
USE Equipment include-
:-Video Analysis & treadmill
:-Electronic & Computerized apparatus
:- Electronics pedometers
:- Satellite positioning system
21. 2- QUALITATIVE METHODS
:- Rancho Los Amigos Hospital rating list
:- ten meter walking test
:-6 minute walk test
:- 2 minute walk test
:- Dynamic gait index
:- Emory Functional profile
:- Timed and go test ( falling in men but not in women)
:- Functional Ambulation categories
:- Tinetti test
29. TEMPORAL/SPATIAL
It consists of
:-The calculation of
speed
:-The length of
rhythm
:- Pitch
Measurements are carried out
through
:- Stopwatch & marks on the
ground
:-Walking on a pressure mat
:-Range laser sensors
scanning a plane a few
centimeters above the floors
:- Inertial sensors and
software to interpret 3D
gyroscope & 3D
accelerometric data
30. KINEMATICS & KINETICS
KINEMATICS
IT is defined as study of angular
rotations of each joint during
movement
It can be observed & measured at
foot, ankle, knee & hip during gait
cycle
Observed in three planes
Sagittal: hip flexion, extension
Coronal: hip abduction, adduction
Transverse: hip rotation,
tibial,foot
KINETICS:- is the study of the
forces involved in the production
of movements
31. SAGITTAL PLANE ANALYSIS OF GAIT
The pelvis is tilted anteriorly
approx-15 degrees
Minimal motion of anterior tilt
When Hamstrings are tight,
pelvis assumes posterior tilt
The hip is flexed at initial
contact & extends during stance
phase
The hip continues to flex during
walking
32. SAGITTAL PLANE ANALYSIS
INITIAL CONTACT
Hip 30 degree of flexion
Knee is extended
Ankle is neutral
GRF
- Anterior to Hip, drives the hip
into flexion
- Anterior to Knee, drives the
knee into extension
- Ankle into planter flexion
33. HIP:- hamstrings, gluteus
maximus, and adductor magnus (i
to e)
KNEE:- quadriceps (c to e)
TIBIOTALAR joint: tibialis
anterior (e)
SUBTALAR joint:- anterior and
lateral compartment muscles (e)
34. SAGITTAL PLANE ANALYSIS
LOADING RESPONSE
Hip extension 25°
Knee flexion 20°
Ankle planter flexion to 10°
Contra-lateral pelvis rotates anterior
GRF
> Anterior to hip
> Posterior to knee
> Posterior to ankle
36. SAGITTAL PLANE ANALYSIS
MID STANCE
GRF through hip, Knee, and
ankle
Muscular activity terminaters
Hip and knee stability
provided by ligamentous
restraints
37. GRF
Posterior to hip
Anterior to knee and ankle
Gastroc-soleus complex fires to
initiate knee flexion
Pelvis continues to rotate,
abductors continue to resist
pelvic drop
38. SAGITTAL PLANE ANALYSIS
TERMINAL STANCE
Single stance : falling
forward
Forward fall of the body
moves the vector further
anterior to the ankle, creating
a large dorsi-flexion moment
Strong activation of gastroc-
soleus complex
Begins as COG passes over
foot & ends when opposite
foot touches ground
39. The body moves past the foot
Hip is in 20 degrees extension
(apparent motion; some of these
comes from pelvic rotation)
Knee is in 5 degrees of flexion
Ankle is in 10 degreed of
dorsiflexion
40. SAGITTAL PLANE ANALYSIS
PRE-SWING
Hip 20° of hyper-extension
Knee 30° of flexion
Ankle 20° of plantar-flexion
Toes 50° of hyper extension
41. GRF
Posterior to hip, knee anterior to
ankle
Rapid flexion of knee from rapid
heel rise and unweighting of limb
Rectus femoris initiates hip flexion
Adductor longus
Hip: iliopsoas, adductor magnus,
adductor longus
Knee: Quadriceps
Ankle: Gastrocsoleus complex
Toes: Ab.hal. FDB, FHB, Introssei,
lumb.
42. SAGITTAL PLANE ANALYSIS
INITIAL SWING
Hip 0- 30° of flexion
Knee from 30- 60° of flexion and
extension from 60-30°
Ankle 20° of plantar-flexion to neutral
Foot clearance is passive due to rapid hip
flexion, unless gait is very slow
In slow gait, tibialis anterior and
hamstring fire to help
Gait cadence (speed) governed by
accelerations of hip flexion during this
phase
43. Hip flexion
- Rectus femoris
- Hiacus
- Adductor longus
- Gracilis
- Sartorius
Rest of limb is passive
pendulum
44. SAGITTAL PLANE ANALYSIS
MID SWING
Tibialis anterior fires to
maintain foot position
Knee extension and hip
flexion continue by
inertia
45. Leg has advanced past the
stance limb
Hip is in 25 degrees of flexion
Knee is in 25 degrees of flexion
(perpendicular to the ground)
Ankle is in 0 degree dorsiflexion
46. SAGITTAL PLANE ANALYSIS
TERMINAL SWING
Decelerate Knee extension and
hip flexion
- Hamstrings
- Gluteus maximus
Quads Co-contract
Tibialis anterior maintains
ankle position
47. The leg extends to provide
length to the step
The hip is in 20 degrees of
flexion
The knee is in 5 degrees of
flexion
The ankle is in 0 degrees of
flexion
53. CEREBRAL PALSYEx:- options for treatment
of cerebral palsy
Botox or the lengthening
Re-attachment or
detachment of particular
tendons
Osteotomy
Gait Analysis is used in
professional sports
training to optimize and
improve athletic
performance
54. 2. Chiropractic & Osteopathic uses
• Gait assessment may be indicative of a mis-aligned pelvis or sacrum
• Both doctors use Gait to discern the listing of a pelvis & can employ
various techniques to restore a full range of motion to areas involved in
ambulatory movement
3. Comparative Biomechanics
By studying the gait of non-human animals
4. Gait as biometrics
• Gait has been established as biometrics to recognize people by the way
they walk
• For forensics use since each person can have a gait define by unique
measurements such as the locations of ankle, knee,hip
55. PURPOSE FOR GAIT ANALYSIS
For a particular disorder
to gain an understanding of the gait
Characterstics of a particular disorder
For a diagnosis
to assist movement diagnosis
For a selective treatment
to inform treatment selective
To Evalute the effectiveness of
treatment
56. Paediatric physiotherapist
Can use gait analysis to help
identify the issues with
developmental delay along with
more general injury
57. SPORTS PHYSIOTHERAPIST
For athletes and knee runners
Sports Physiotherapist can use
gait analysis to improve the
efficiancy of their running style