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Biomechanics Exam 3 (Ash) > 1st Ray > Flashcards

1st Ray Flashcards

1
Q

what is the inferior surface of the 1st MT head grooved for?

A

articulation with the sesamoids

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2
Q

what are the sesamoids embedded in

A

the plantar plate

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3
Q

Sesamoids divide the plantar plate into what ligamentous regions?

A
  1. metatarsosesamoid ligaments (medial and lateral)
  2. phalangeosesamoid ligaments (medial and lateral)
  3. intersesamoid lig
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4
Q

what forms the sesamoid apparatus?

A
  1. tendon of FHB
  2. tendon of abductor hallucis
  3. conjoined tendon of adductor hallucis
  4. sesamoids
  5. plantar plate (includes sesamoid ligaments)
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5
Q

what bones does the 1st ray consist of

A

First MT and 1st cuneiform

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6
Q

what bones does the 1st ray articulate with

A

navicular, 2nd MT base and intermediate cuneiform

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7
Q

describe the motion of the 1st ray

A

uniaxial but triplanar

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8
Q

where does the axis of the 1st ray pass?

A

anterior, lateral, plantar to posterior, medial and dorsal

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9
Q

does the 1st ray provide for supination/pronation

A

NO, axis is directed opposite to the joints that provide for supination/pronation

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10
Q

the 1st ray is deviated:

  • – from the sagittal plane
  • – from frontal plane
  • – from transverse plane
A

45
45
9

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11
Q

what type of motion occurs at the 1st ray

A

equal dorsiflexion/inversion and plantarflexion/eversion

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12
Q

what are some planal dominance of the 1st ray

A
  • sagittal plane deformity
  • dorsiflexed 1st ray
  • congenital dorsiflexed 1st ray (metatarsus primus elevatus)
  • acquired dorsiflexed

are typically bilateral and usually asymmetric

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13
Q

what are etiologies of a dorsiflexed 1st ray

A
  • compensated RF varus
  • FF supinatus
  • abnormal STJ pronation (PL tendon looses its pull allowing the 1st ray to dorsiflex)
  • spasm of the TA
  • paresis or paralysis of the posterior tibial
  • compensated FF varus
  • iatrogenic
  • trauma
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14
Q

what are clinical observations that are symptomatic of a dorsiflexed 1st ray?

A
  • hallux limitus
  • dorsal prominence
  • hyperkeratotic lesions submet 2 and plantar aspect of the IPJ of the hallux
  • during gait the STJ pronates and the calcaneus everts during propulsion
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15
Q

what are etiologies of a plantarflexed 1st ray

A
  • congenital
  • uncompensated RF varus
  • FF valgus
  • peroneal longus spasm
  • paralysis of the TA and gastroc/soleus complex
  • iatrogenic
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16
Q

what are clinical observations of a plantarflexed 1st ray

A
  • hyperkeratosis submet 1 and 5
  • compensation causing STJ supination
  • acquired pes cavus foot type
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17
Q

plantarflexed 1st ray treatment

A

NSAIDs, analgesics
Orthotics (treat biomechanic abnormaility, 1st ray cut out to accommodate the 1st MT and sesamoids)
Surgical osteotomy

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18
Q

what is hallux limitis

A
  • deformity of the 1st MPJ
  • base of the proximal phalanx of the hallux is subluxed plantarly on the 1st MT head
  • hallux is unable to move on the dorsum of the 1st ray
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19
Q

in younger patients with hallux limitus, you usually see

A

an exostosis

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20
Q

in older patients with hallux limitus, they usually present with

A

DJD of the articular surface

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21
Q

etiologies of hallux limitus

A
  • hypermobility of the 1st ray
  • excessively long 1st ray
  • dorsiflexed 1st ray
  • arthritis
  • trauma
  • osteomyelitis/septic joint
  • paralysis of PL or spasm of TA
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22
Q

clinical features of hallux limitus

A
  • 1st MT head is square in shape
  • boney proliferation of the 1st MPJ
  • compensation at the joint most distal AND most proximal
  • tendonitis of the EHL
  • decrease length of propulsion
  • hyperkeratosis at the plantar aspect of the IPJ of the hallux
  • trauma to the toenail
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23
Q

what is stage 1 of hallux limitus?

A

No DJD on x-ray
Normal ROM on non-weight bearing
No pain at end ROM

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24
Q

what is stage 2 of hallux limitus?

A

Pain at end ROM
Flat 1st MT head
Dorsal exostosis and periarticular lipping

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25
Q

what is stage 3 of hallux limitus

A

Crepitus on ROM
Joint space narrowing
Osteophyte formation
Increase flattening of the 1st MT head

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26
Q

what is stage 4 of hallux limitus

A
  • obliteration
  • osteophyte fragmentation
  • minimum ROM/total ankylosis
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27
Q

what is the Drato, Oloff and Jacob Classification

A

Stage 1 - Pre-hallux limitus
Stage 2 - Structural adaptation
Stage 3 - Bone destruction
Stage 4 - End stage

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28
Q

what is functional hallux limitus

A

-limitation of the dorsiflexion of the 1st MPJ available during the stance phase of gait

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29
Q

is pain present upon examination of a functional hallux limitus

A

no (only a problem when ambulated)

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30
Q

what is required for treatment of a functional hallux limitus

A
  • recognize etiological factors
  • examine the LE and foot
  • examine both weight-bearing and non weight-bearing ROM
  • examine gait analysis
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31
Q

what is the conservative treatment for functional hallux limitus

A

NSAID
Steroid medication/oral or intra-articular injections
Orthoses - functional hallux limitus
Shoe gear - high toe box, steel shank, lower heel height, proper shoe size, avoid heel lifts

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32
Q

HAV deformity occurs in what planes?

A

transverse AND frontal plane

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33
Q

what kind of deformity is HAV

A

Progressive subluxation of the 1st MPJ during the propulsive phase of gait

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34
Q

what are the pathomechanics of HAV

A
  • hypermobile 1st MT head inverts relative to the hallux
  • a valgus subluxation occurs at the hallux at the 1st MPJ
  • base of the proximal phalanx of the hallux subluxes laterally on the 1st MT head
  • hallyx abducts on the 1st MT head
  • the 1st ray subluxes at its base and the 1st MT adducts
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35
Q

Etiologies of HAV

A
  • hypermobile 1st ray
  • rheumatoid arthritis (system disease)
  • neuromuscular disease
  • iatrogenic
  • abnormal STJ pronation
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36
Q

what occurs during Stage 1 of HAV deformity

A
  • lateral subluxation of base of proximal phalanx

- minor lateral sesmoid displacement

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37
Q

lateral subluxation of base of proximal phalanx is only evident in what kind of x-ray

A

weight-bearing AP views

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38
Q

what occurs during Stage 2 of HAV deformity

A
  • abduction deformity of the hallux
  • hallux presses against 2nd toe
  • medial bump
  • sesmoids shift laterally
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39
Q

what occurs during Stage 3 of HAV deformity

A
  • increased widening of the foot
  • increase intermetatarsal angle
  • tibial sesmoids are lateral to the 1st MT head
  • mononeuritis is a common complaint
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40
Q

what occurs during Stage 4 of HAV deformity

A
  • dislocation or major subluxation of the hallux
  • overlapping 2nd digit
  • frequently seen in conjunction with rheumatoid arthritis
  • apropulsive gait
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41
Q

rate of development of HAV depends on

A
  • extent or amount of abnormal STJ pronation
  • size of the FF adducts angle
  • extent of calcaneal eversion
  • extent of STJ an MTJ subluxation
  • extent of chronic inflammation at the 1st MPJ
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42
Q

what are other factors of HAV

A
  • inclination angle of the STJ (, more calcaneal eversion with STJ pronation)
  • excessive angle and base of gait
  • absence of a propulsive period during stance phase
  • obesity (may widen the base of gait)
  • length of stride (if there is pronation during propulsion)
  • hard flat terrain (can cause more abnormal pronation)
  • abnormal fitting shoe gear
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43
Q

treatment of HAV

A

conservative - NSAIDs, steroid injection

  • change in shoe gear*** (MUST DO THIS)
  • orthoses
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44
Q

what is juvenile HAV deformity

A
  • onset may occur at any age
  • Root - “onset occurs when the child develops a propulsive gait (HAV is acquired)”
  • a deformity exists in an individual 20 years-old or younger due to growth and remodeling of articular cartilage
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45
Q

factors associated with juvenile HAV

A 
Metatarsus Adductus
Pes Planus
Ankle Equinus
Hypermobile First Ray
Neurological Disorders
Juvenile Rheumatoid Arthritis
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46
Q

treatment of juvenile HAV

A
  • conservative
  • splints
  • bunion shield
  • shoe
  • orthoses
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47
Q

what are the 2 surgical treatments for juvenile HAV

A

Delay surgery until skeletal maturity has occurred to avoid injury to the epiphyseal structures

Perform surgery before adaptive changes has created permanent alterations of structures

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48
Q

what is splay foot

A
  • progressive abnormal transverse plane spreading of the MT

- an abnormally large intermetatarsal angle btwn the 1st and 2nd and the 4th and 5th MT

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49
Q

what are etiologies of spay foot

A
  • abnormal STJ pronation

- subluxation of the rays at their basal joints which articulate with the navicular, cuboid and with each other

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50
Q

pronation in a splay foot can cause

A
  • decrease transverse arch
  • talus is displaced medially and plantarly
  • if MT primus adducts and subluxation of the 5th ray is present, there is an increase in the angle btwn the 1st and 2nd MT and 4th and 5th MT
  • the entire MT will become less stable to vertical GRF and ligaments become stretched
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51
Q

what are clinical features of Splay foot

A
  • wide FF
  • prominent HAV and Tailors bunion
  • digital deformities
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52
Q

what is the normal IM angle of MT 1 and 2

A

7-9

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53
Q

what is the normal IM angle of MT 4and 5

A

9

54
Q

what will be present in a radiograph of a splay foot

A
  • increase IM angle btwn 1,2 and 4,5

- 5th ray is more dorsiflexed with lateral bowing of the shaft

55
Q

treatment of Spay foot

A 
Conservative
Shoes
Orthoses to correct pronation
Surgical
Correction of associated problems (HAV, Tailors bunion)
56
Q

Metatarsus Primus Adductus deformity is in what plane

A

-transverse plane deformity of the 1st ray

57
Q

what is Metatarsus Primus Adductus deformity

A

1st MT and cuneiform gradually sublux away from the 2nd ray

58
Q

etiologies of Metatarsus Primus Adductus deformity

A

(same as splay foot)

  • abnormal STJ pronation
  • subluxation of the rays at their basal joints which articulate with the navicular, cuboid and with each other
59
Q

what is the 5th ray composed of

A

5th MT only

60
Q

what type of motion occurs at the 5th ray

A

uniaxial, triplanar

61
Q

where does the axis of the 5th ray pass through

A

proximal,plantar,lateral to dorsal,distal, medial

62
Q

5th ray deviates primarily from what planes

A

sagittal and frontal (only slight deviation from the transverse plane)

63
Q

what type of motion does the 5th ray provide

A

supination + pronation

64
Q

Tailors Bunion deformity occurs in what plane

A

transverse plane

65
Q

what can be seen present with a Tailor’s bunion

A
  • 5th MT head develops a lateral prominence
  • isolated deformity or part of a splay foot
  • inflammed bursa
66
Q

Etiologies of a Tailors Bunion

A

Abnormal STJ pronation plus uncompensated varus deformity
Abnormal STJ pronation plus hypermobile 5th Ray
Congenital dorsiflexed 5th Ray (not curved laterally on x-ray)
Congenital plantarflexed 5th Ray
Idiopathic (absence of the adductus hallucis muscle)

67
Q

clinical features of Tailor’s Bunion

A
  • prominent 5th MT head
  • possible overlying adventitious bursa formation of the 5th MT head
  • hyperkeratotic lesion submet 5
  • prominence 5th MT base
68
Q

radiographic features of Tailor’s Bunion

A
  • increased IM angle btwn 4th and 5th MT
  • increased lateral deviation angle
  • large dumbell shaped 5th MT head
  • arthritic changes leading to exostosis formation at the 5th MPJ
  • rotoation of the lateral plantar tubercle to the lateral position
69
Q

treatment of Tailor’s Bunion

A

Conservative
NSAID, Steroid injection
Shoes
Assessment of underlying medical conditions which may aggravate the condition
Tapping or padding on painful boney prominence
Debridement of hyperkeratotic lesions

70
Q

central ray consist of what rays

A

rays 2nd and 3rd metatarsals and cunieforms and 4th MT only

71
Q

rays 2-4 provide —- plane motion

A

sagittal

72
Q

the 3rd ray has less ——- than the 2nd and 4th ray

A

dorsal excursion

73
Q

pathomechanics of 1st ray deformities

A
  • isolated structural deformities
  • a long 1st MT or long proximal phalanx can cause hallux limitus, digital deformities and callus
  • a short 1st MT-brachymetatarsal can cause callus, HAV and digital deformities
74
Q

what are central ray deformities associated with sagittal plane relationship?

A

Metatarsal equinus-associated with Pes cavus
Metatarsal abductus/adductus-usually mechanically induced synovitis or rheumatoid arthritis
Metatarsal dislocation-radiographs confirm diagnosis
Central Ray deformities associated with abnormal metatarsal head structure
Hypertrophy of the plantar condyles-Lateral condyle most common occurrence
Avascular Necrosis

75
Q

what is avascular necrosis

A

abnormal blood supply to the bone causing a local infarct

76
Q

where is avascular necrosis commonly seen

A

in the 2nd met head (Freiburg’s disease)

77
Q

avascular necrosis is caused by

A

repetitive microtrauma or major trauma to the growth plate

78
Q

where is the pain and deformity with avascular necrosis

A

met head

79
Q

avascular necrosis is clinically associated with

A
  • history of trauma
  • localized pain at leve of joint
  • flat MT head or proximal phalanx base
  • punctate keratosis
80
Q

General Treatment for Central MT Ray Deformity

A

Conservative

Pain meds, debridement of keratotic lesions, padding of keratotic lesions and boney prominence, orthoses (functional or accommodative) and shoe therapy

Surgical (high failure rate for certain procedures)

Osteotomy, proximal or distal - to elevate metatarsal head

Plantar condylectomy, partial or total metatarsal head resection, and arthroplasty of the involved joint

81
Q

what is predislocation syndrome

A
  • painful instability of the lesser MPJ
  • dislocation of the proximal phalangeal base of the MT head
  • is progressive
82
Q

why does predislocation syndrome occur

A

due to weakening of the periarticular structure that stabilize the MPJ (plantar plate)

83
Q

what are signs of predislocation syndrome

A
  • medial or lateral deviation of digit (medial most common)
  • hammertoe deformity - dorsal corn is not present
  • 2nd MPJ is affected mot often
84
Q

what are clinical presentations of predislocation syndrome

A 
Acute or chronic focal plantar pain
Pain on ambulation/subsides at rest
Swelling plantar aspect of the foot
Patient relates “Walking on Stones”
History of trauma/increase activity level
Patient was given a diagnosis of Neuroma
85
Q

what is Stage 1 of predislocation syndrome

A

mild edema plantar, dorsiflexed MPJ, extreme tenderness on manipulation, no anatomical misalignment

86
Q

what is Stage 2 of predislocation syndrome

A

moderate edema, deviation of affected digit on radiograph and clinically

87
Q

what is Stage 3 of predislocation syndrome

A

moderate edema of the entire circumference of the MPJ and extending to digit, more pronounced deviation, possible subluxation

88
Q

what is another name for vertical stress test

A

Thompson and Hamilton

89
Q

how is a vertical stress test performed

A

Foot is in neutral stance

Metatarsal head is stabilized between two fingers, the other hand grabs the base of the proximal phalanx

Vertical force is applied to the base of the proximal phalanx in a dorsal direction

Positive test-when the proximal phalanx can be translocated 2mm dorsally above the metatarsal head

90
Q

what are differential diagnosis for predislocation syndrome

A 
DJD of MPJ
Avascular Necrosis - xray
Rheumatoid Arthritis
Neuromuscular Dysfunction
Neuroma – rule out using ultrasound
91
Q

pathomechanics of predislocation syndrome

A

-any structural or biomechanical deformity that increases loading forces within the FF and results in inflammation of the plantar plate

92
Q

examples of pathomechanics of predislocation syndrome

A 
Long 2nd metatarsal
HAV
High Heeled shoes
Heel lifts
Hypermobility
Metatarsus Primus Elevatus
Ehlers - Danlos syndrome
93
Q

what is the plantar plate

A

fibrocartilage thickening of the 1st MPJ capsule

94
Q

what is the plantar plate attached to

A
  • firmly attached to the base of the proximal phalanx, loosely attached to the MT head
  • major distal attachment to the plantar fascia
  • attachment to the deep transverse MT ligament, MPJ collateral lig, interosseous, and lumbricales muscles
95
Q

what is the function of the plantar plate

A

stabilizes the lesser MPJ plantarly

96
Q

diagnosis modality of the plantar plate

A
  1. x-ray - lateral and DP (MT length)
  2. arthrogram - evaluate integrity of the joint capsule. Inject contrast dye dorsally
    Opaque if joint capsule is ruptured, if it leaks outside the joint capsule, the collateral ligaments are ruptured
  3. MRI
97
Q

conservative treatment of fractured plantar plate

A

Steroid (oral and injectable)
NSAIDS
Metatarsal sling pad/taping
Longitudinal Metatarsal Pad with a lesser MPJ cut out
Shoe gear - extra depth shoes with a rocker bottom and a steel shank
Physical Therapy

98
Q

what is the goal of performing a plantar plate surgery

A
  • release the periarticular contracture and decompression of the MPJ to reestablish alignment of the digit
  • restore plantar plate function and release dorsally contracted structures
99
Q

what procedures can be performed at the plantar plate

A

Primary repair of plantar plate

Tendon Transfer (EDB)

Soft tissue and Osseous-resection of Proximal Phalanx base, Partial Metatarsal head resection, Oblique osteotomy of metatarsal head and neck

Arthrodesis (fusion) of the PIPJ

Extensor hood release

Dorsal, medial, and lateral MPJ capsule release

K-wire driven across the MPJ for 5 to 7 weeks

100
Q

name sagittal plane digital deformities

A
  • hammer toe
  • claw toe
  • mallet toe
  • hallux extensus
  • hallux flexus
101
Q

name transverse plane digital deformities

A
  • digiti abductus
  • digiti adductus
  • hallux interphalngeus
102
Q

name frontal plane digital deformities

A

-curly toe/varus

103
Q

name combination digital deformities

A

adductovarus toe

104
Q

what are the primary muscles involved in digital functions

A
  1. Intrinsic - lumbricales, quadratus plantae, interossei, EDB, FDB
  2. extinsic - FDL, EDL, FHL, EHL
105
Q

describe a hammer toe

A
  • Dorsiflexed position of the proximal phalanx at the MPJ

- Plantarflexed position of the middle phalanx at the PIPJ and an extended position of the distal phalanx at the DIPJ

106
Q

describe a claw toe

A

Dorsiflexed position of the proximal phalanx at the MPJ and plantarflexed position of both the middle and distal phalanx at the PIPJ and DIPJ

107
Q

describe a mallet toe

A

Plantarflexed position only of the distal phalanx at the DIPJ

108
Q

what is hallux extensus

A

Extended or dorsiflexed position of the distal phalanx of the hallux at the IPJ

109
Q

what is hallux flexus

A

Mild plantarflexed position of the distal phalanx of the hallux of the IPJ and mild dorsiflexion at the MPJ

110
Q

what is hammer digit syndrome (HDS)

A

loss of normal muscle balance

111
Q

how can a HDS exist as

A

a classic hammer or claw toe deformity

112
Q

etiologies of HDS

A 
Flexor Stabilization (most common)
FDL & FDB gains a mechanical advantage over the interossei during stance phase of gait
113
Q

HDS causes

A
  • flexible/hypermobile foot
  • FF valgus
  • interosseous muscle weakness
  • adductovarus deformity of the 4th and 5th toe
114
Q

flexor substitution is a rare cause of

A

HDS

115
Q

what is flexor substitution

A

substitution of the deep posterior and lateral components of the leg for the triceps surae during late stance phase of gait. The flexors will fire early and longer causing severe digital contractions with no adductovarus component

116
Q

what is the cause of triceps weakness

A

neurogenic or iatrogenic

117
Q

what is extensor substitution

A

-mechanical advantage of the extensors over the lumbricales during the swing phase of gait

118
Q

extensors substitution can cause what deformities

A

hammer toe

claw toe

119
Q

extensor substitution can be seen with

A
  • ankle and MT equinus
  • lumbricale wakness
  • EDL spasticity
120
Q

where can extensor substitution be seen

A

at the hallux and lesser digits

121
Q

etiologies of hammer toe deformity

A 
Plantarflexed deformity of the metatarsal
Loss of lumbricles function
Imbalance between medial and lateral interossei muscle
Flaccid paralysis of EDB and EDL
Brachymetatarsal
Forefoot valgus
Abduction pressure from the hallus
Subluxed pronated 5th metatarsal
Trauma to MPJ
122
Q

etiologies of claw toe deformity

A 
Forefoot adductus
Congenital plantarflexed 1st Ray
Inflammatory arthritis
Contracture or spasm of the long and short flexors
Gastrocnemius pareis
Supinated forefoot deformity
Forefoot equinus
123
Q

Clinical fetures of HDS

A

Bursitis of the involved IPJ
Flexor plate dislocation
MTJ limitus, abductus, adductus
Rotation of a digit, long and short digits
Ulceration, nail pathology, subungual exostosis, neuritis
Kelikian push-up test - assessing the degree of rigidity of the HDS deformity

124
Q

when does hallux extensus usually occur

A

secondary to hallux limitus

125
Q

what is hallux extensus

A

Pain present on plantar aspect of IPJ hallux, plantar keratoma at IPJ, distal subungual exostosis, nail pathology

126
Q

what foot types is hallux extensus associated with

A

Compensated forefoot varus
Forefoot valgus
Compensated gastrocnemius equines

127
Q

what is hallux interphalangeus

A

The distal phalanx of the hallux is deviated away from the midline of the body

128
Q

when can hallux interphalangeus occur

A

isolated or with a HAV deformity

129
Q

what can aggravate hallux interphalangeus

A

valgus rotation of the hallux

130
Q

where can digital adductus occur

A

at the MPJ, PIPJ or DIPJ

131
Q

congenital hallux interphalangeus affects the

A

distal phalanx

Biomechanics Exam 3 (Ash) (9 decks)

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