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Biomechanics of F t and Podiatry Physical Therapy. Huei-Ming Chai, PT PhD School of Physical Therapy National Taiwan University, Taipei, Taiwan June 21, 2008. 孟子曰 : 人之异于禽兽者几希,庶民去之,君子存之。舜明于庶物,察于人伦,由仁义行,非行仁义也 。 -- 离娄下第十九. 孟子曰 : 人之异于禽兽者几希. plantigrade of foot widening of pelvis - PowerPoint PPT Presentation
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Biomechanics of F t and Podiatry Physical Therapy
Huei-Ming Chai, PT PhDSchool of Physical Therapy
National Taiwan University, Taipei, TaiwanJune 21, 2008
孟子曰 : 人之异于禽兽者几希,庶民去之,君子存之。舜明于庶物,察于人伦,由仁义行,非行仁义也 。 -- 离娄下第十九
• plantigrade of foot
• widening of pelvis
• erect spine
• delicate function of hand
孟子曰 : 人之异于禽兽者几希
Plantigradeplanta = sole gradi = walk
bipedal quadripedal
ankle
ankle
MP joints
Biomechanics of Foot and Podiatry Physical Therapy
Biomechanics of Foot– Bony structure and joints of foot– Types of foot
• Foot Orthotic Therapy
• Podiatry Physical Therapy
Medial Aspect of Foot
subtalar joint
Forefoot Midfoot Rearfoot
medial longitudinal arch
calcaneus
talus
navicular
1st metatarsalphalanx
1st cuneiformMT head
Superior Aspect of Foot
calcaneus
talus
navicularmetatarsals
phalanges
Forefoot Midfoot Rearfoot
cuneiforms
cuboidmidtarsal joint
fibula
talus
tibia
mediallateral
Anterior Aspect of Foot
subtalar jointcalcaneus
MTHs
anterior aspect
Neutral Foot ( 正中足 )
• Subtalar joint is placed at the neither pronated nor supinated position
• subtalar neutral position– calcaneus ground– tibia ground– metatarsal heads // ground
subtalar joint neutral
tibial bisecting line
calcaneual bisecting lineplantar surface
of MTHs
Pronated Foot ( 內旋足 )
non-weight-bearing weight bearing
forefoot varus STJ
pronated
(plantigrade)
Talus shiftsmedially +inferiorly
STJ neutral
Pronated Foot
• pronation of rearfoot with respect to forefoot (decreased arch) as foot is loaded
• NOT structural flat foot
• resulting in pain or dysfunction of foot or other WB joints
NWB
4.6 cm
WB
3.0 cm
Wearing Pattern in Pronated Foot
pronated foot
medial side wearing
內
外
normal wearing pattern
neutral stance
WBstance
Problems Related to Pronated Foot
• Plnatar faciitis
• Achilles tendinitis
• Arch pain
• Metatarsalgia
• Tibialis posterior tendinitis
• Chondromalacia patella
• Low back pain
Supinated Foot ( 外旋足 )
non-weight-bearing weight bearing
forefoot valgus
STJ neutral
STJsupinated
(plantigrade)
Talus shiftslaterally +superiorly
Supinated Foot
• supination of rearfoot with respect to forefoot (increased arch) as foot is loaded
• NOT structural high-arch foot
• resulting in pain or dysfunction of foot or other WB joints
NWB
5.5 cm
WB
6.2 cm
Three Foot Types at Stance
外旋足supinated foot
10%
正中足neutral foot
60%
內旋足pronated foot
30%
Biomechanics of Foot and Podiatry Physical Therapy
• Biomechanics of Foot
Foot Orthotic Therapy– Concept I: plantigrade– Concept II: total contact– Concept III: neutral foot
• Podiatry Physical Therapy
Concept I: Plantigrade
• to provide plantigrade by 3-point contact to the ground
• examples– therapeutic exercises– orthopedic surgery– shoe modifications 5th MTH
heel
1st MTH
Concept II: Total Contact
• to provide even distribution of WB onto whole foot by total plantar surface of foot contacting ground
• Increase area of contact to decrease pressure since P = F /A
• examples:– filling stuff into shoes to support the arch– total contact orthoses
transverse arch
medial longitudinal
arch
lateral longitudinal
arch
Concept III: Neutral Foot
• to provide balance of soft tissues by control subtalar joint in neutral position
• examples:– functional foot orthoses
STJ neutral
tibial bisecting
line
calcaneual bisecting lineplantar surface
of MTHs
Functional Foot Orthosis
• to maintain the foot in the subtalar neutral position
• to disperse the body weight as even as possible
Neutral Cast -- Prone Technique
Making A Positive Mold
Fabrication
Various Posting
heel liftmetatarsal pad
medial post
lateral post
Benefits from Using Functional Foot Orthosis
• To re-align foot structure for malalignment – to control excessive motion– to change weight bearing pattern– to equalize leg length– to support deformed structure
• To relieve pain for painful foot
• To re-distribute weight bearing for insensitive foot
Biomechanics of Foot and Podiatry Physical Therapy
• Biomechanics of Foot
• Foot Orthotic Therapy
Podiatry Physical Therapy– Example I: pronated foot– Example II: one pronated and another supinated
Podiatry Physical Therapy
• Podi = foot
• DPT: one kind of physical therapy intervention to assess, treat, and prevent foot and ankle problems– movement – manual– modality– assistive device
– podiatrist (DPM) vs. certified pedothist (CPED)
Indications of Podiatry PT
• utilization of functional foot orthosis as a component of the total treatment program for– back and hip pain related to foot dysfunction– patellofemoral syndrome– shin splint– plantar fasciitis– foot sprain or deformities– heel pad syndrome– ……
Case #1
• A 22 year-old male was unable to stand longer than 10 minutes. He felt lateral knee pain during walking.
• diagnosis: severe pronated feet due to forefoot varus
• prescription: functional foot orthoses with forefoot medial postings
• pain decreases immediately
• changes orthoses every 3-4 yrs
Case #2• A 38 year-old male stands with one foot pronated
and another foot supinated. His chief complaints are low back and currently treated by PT.
natural stance stance c/ pelvis leveled
柴惠敏[email protected]://www.pt.ntu.edu.tw/hmchai/