Presentation on theme: "Dr.Manal Radwan Salim Lecturer of Physical Therapy Pharos University Pathomechanics of Gait and Dynamic Postures part 2."— Presentation transcript:
Dr.Manal Radwan Salim Lecturer of Physical Therapy Pharos University Pathomechanics of Gait and Dynamic Postures part 2
(2) Pelvic Tilt : 5 o dip of the swinging side (i.e. hip adduction) maximum tilt is in mid swing Advantage: Reduces the height of the apex of the curve of COG by 3/8 inch Pathologically: Pelvis dip increase downward of swing side by weakness of abductors of stance limb., or even pelvis raised up in swing in any problem leads to functional lengthening the swing limb.
(3) Knee flexion in stance phase : in Loading response, midstance Shortens the leg in the middle of stance phase Advantage: Reduces the height of the apex of the curve of COG Pathologically: flexion degree may increases (shorter stance than usual so gives apparent longer swing Or there is limitation in flexion (longer stanced limb i.e affected give problems in other leg stance?!)
(4) Ankle Mechanism : lengthens the leg at heel contact Advantages: a)Smoothens the curve of COG b)Reduces the lowering of COG
(5) Foot mechanism : While knee is flexed the leg is lengthened at toe- off as ankle moves from dorsi flexion to plantar flexion Advantages: a) Smoothens the curve of COG b) Reduces the lowering of COG
(6) Lateral displacement of body: The COG is displaced laterally over the weight bearing extremity twice during gait cycle( the motion produced by horizontal shift of pelvis and relative adduction of hip (max at mid stance).
Gluteus maximus shows peak activity in IC, LR (i.e. weight acceptance), and TS, some activity in PS( weight release). Weakness in G. Max.: Appears in Early stance: IC, IC-LR). G. Max. contract to prevent jack-knifing i.e. excessive hip flexion) and anterior pelvic tilt. N. Path. GRFV IC A to hip LR
From this we can notice that: If bilateral weakness so The gluteus maximus lurch appears in both early and late stance phases of rt limb and lt limb. If unilateral (rt) so it appears in early stance of rt > in late stance of lt Gluteus Maximus Cont. Possible Compensation Patient leans trunk backward (so moves GRFV backward). This is called gluteus maximus gait or Lurch gait
In stance its activity starts at terminal stance to preswing and increases to initiate swing. Effect of weakness Toe may not clear the floor during swing “Toe Drag”. Compensation: -circumduction at hip. -Pelvic Hike
Quadriceps shows peak activity in LR (i.e. weight acceptance). Some activity in TS and PS (weight release). N. Path. GRFV LR P. To knee In Early stance : Quad. contracts to prevent jack-knifing of knee. Possible Compensation: 1-Patient leans trunk forward (GRFV moves anterior). 2-Pt use arm as quadriceps by placing hand anterior to thigh, presses knee backward. 3-Turn limb outward to lock knee passively.
In Late stance: Quad. contracts to control knee flexion So in case of weakness the knee collapse into flexion leading to - premature flexion into early swing- ‘rubber knee ’ N. Path. GRFV PS P to knee In Early stance Cont. : 4- Contact ground with flat planter flexed foot so GRFV moves anterior. 5-place a shoe or cushion under heel which causes GRFV to move anteriorly.
In stance: It show little activity, support back of knee against extension moment of GRFV. In swing: *Assist knee flexion in IS. *Decelerates tibial shank in TS Weakness in Hamstrings: In Swing : 1- Inadequate knee flexion. Late Swing: 2- Lack of control of swinging leg 3- Knee slapped into extension. In Stance: 4 -Reduction of restraining force of heel strike. 5- Progressive Genu Recarvatum. Compensation: 1- Increased hip flexion in swing 2- Circumduction in swing hip 3- Hiking with swing pelvis
Possible causes When in gait cycle descriptionGait type Spasticity inLimited ROM, pain, ….. Weaknes s in in early stance Lean trunk backward G. maxim us lurch or spasticity in quadriceps or planter flexors Flexion of hip, knee or ankle h. Flex, hamstrin g, dorsiflex ors swingToe drag Hip flexors, hamstrin g swingcircum ductio n Hip flexors, hamstrin g swingPelvis hiking
Possible compensations manifestationWhen in Gait cycle proble m Outward rotate leg to lock it passively Place hand in early stance to push knee backward Lean trunk forward in stance Jack Knifing of knee ICQuad weakn ess place a shoe or cushion under heel so GRFV moves anteriorly. IC with flat planter flexed foot so GRFV moves anterior. Pelvis hikingCircumductionIncresed hip flexion in swing Progressive Genu Recarvatum Mid stanceHamst ring weakn ess Reduction of restraining force of heel strike Knee slapped into extension deceleratio n Increased hip flexion midswing
Ankle dorsi flexors shows peak activity in IC, LR (i.e. weight acceptance). Weakness in DF appears in a) Early stance: IC, IC-LR). DF Contract to control forefoot lowering. After forefoot contacts floor- pull tibia forward over foot. N. Path. GRFV IC P to ankle LR
b) Swing phase: DF contract concentrically in swing sub phases 1- to lift toe up so prevent toes from dragging on ground. 2- functionally shorten swinging limb. Compensation: In stance: no compensation what happen is forefoot slaps to the floor ‘drop-foot’ gait In Swing: 1-Increased hip flexion ‘high steppage gait’ 2- Circumduction at hip.
Calf activity in TS and PS, some activity in MS Weakness in calfs appears in late stancemuscles show peak : as it controls dorsi flexion degree in MS and TS ecentrically. N. Path. GRFV A. To Ankle MSTSPS Then contract concentrically to planter flex ankle joint in PS. Effect of Weakness: Loss of forward thrust - poor transition to early swing
Possible Compensation: 1- Outward rotate hips and pronate foot so inner border contact the ground (flat foot gait or calcaneal gait) 2-Ankle maintained in planter flexion in mid stance to avoid excessive dorsi-flexion ?! (passively by genu recarvatum). 3-Maintain foot flat in TS to eliminate dorsi- flexion moment.
N. Path. of GRFV LRMSTs Medial to to hip G. Medius contract in mid stance to prevent contra-lateral (swinging) hip from dipping greater than 5 – 8 0 Effect of weakness/absence Contra-lateral hip drops > Compensation is to lean ( ‘ lurch ’ ) over stance-side LE
A. Antalgic Gait. B. Lateral Trunk bending. C. Functional Leg-Length Discrepancy. D. Increased Walking Base. E. Inadequate Dorsi flexion Control. F. Excessive Knee Extension.
-Gait pattern in which stance phase on affected side is shortened -Corresponding increase in stance on unaffected side -Common causes: OA, tendinitis
Usually unilateral, if Bilateral = waddling gait Common causes: A. Painful hip B. Hip abductor weakness C. Leg-length discrepancy D. Abnormal hip joint
Swing leg: longer than stance leg: Causes dicussed in details in muscle weakness 4 common compensations: A. Circumduction B. Hip hiking C. Steppage D. Vaulting
Normal walking base: 5-10 cm Common causes: Deformities Abducted hip Valgus knee Instability Cerebellar ataxia Proprioception deficits
In stance phase (Heel contact – Foot flat): Foot slap In swing phase (mid-swing): Toe drag Causes: Weak Tibialis Ant. Spastic plantarflexors
Loss of normal knee flexion during stance phase Knee may go into hyperextension Genu recurvatum : hyperextension deformity of knee Common causes: Quadriceps weakness (mid-stance) Quadriceps spasticity (mid-stance) Knee flexor weakness (end-stance) * * *
Gait was guarded and restrained - attempt to maximal stability and security
Gait resembled someone walking on a slippery surface decreased step & stride legnth wider dynamic BOS increased lateral head movement decreased rotation of pelvis
toe/floor clearance distance slightly decreased lower stance-to-swing ratio decreased reciprocal arm swing more from elbow than shoulder
Spasticity - resistance to passive stretch
Effects: Restrict joint excursion Delay transition from one gait phase to the next
Quadcriceps May prevent knee from unlocking during interim between HS and FF Knee maintained in extension leading to a ‘ vaulting ’ over stance limb or circumduction of hip Disrupts (timing) transition to mid- and late stance May prevent LE bending during swing phase
Plantar flexors Increase in spastic tone may limit forward rotation of tibia between MS and PO May locate ground reaction force well behind knee causing significant flexion moment during late MS and knee buckling tendency Ankle may be locked up during PO decreasing propulsive thrust forward - inefficient transition from TO to early swing
Hamstrings May limit forward swing of LE - decreasing step length May prevent knee from reaching a terminally extended position just prior to HS