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MSK 3 > TMJ > Flashcards

TMJ Flashcards

1
Q

Lower portion of joint capsuleattaches ________________ to _______

A

mandibular condyle to disc

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2
Q

Upper portion joint capsule attaches ______ to _____________

A

disc to temporal bone

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3
Q

Where is the joint capsule thin and thick?

A
  • thin posteriorly and anteriorly
  • thickened/supported laterally/medially by collateral ligaments
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4
Q

What is the thickest and thinnest part of the disc?

A
  • anterior is thickets
  • thinnest in middle
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5
Q

What is the disc attached to? (3 total, anterior and posterior)

A
  • joint capsule
  • posterior - retrodiscal lamina
  • anterior - lateral pterygoid and anterior articular capsule
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6
Q

action of lateral pterygoid

A

Pulls disc forward (concentrically) during opening and gradually pulls it (eccentrically) during closure

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7
Q

What is the function of the disc?

A

Separates joint cavity into two functional components
- Upper joint is a plane gliding joint for translation of mandible condyles
- Lower joint is a hinge joint that permits rotation of condyles

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8
Q

What is the retrodiscal lamina? Function?

A

Fatty layer that is innervated well to help with proprioception
- stabilize disc
prevents excessive translation of the disc over the condyle

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9
Q

What counters the lateral pterygoid pull?

A

tempromandibular ligament
- helps prevent posterior dislocation of the joint
- prevents medial slippage of disc

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10
Q

What are the muscles of mastication?

A
  • temporalis
  • masseter
  • medial pterygoid
  • lateral pterygoid
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11
Q

What are the suprahyoid muscles?

A
  • stylohyoid
  • digastric
  • geniohyoid
  • mylohyoid
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12
Q

What are the infrahyoid muscles?

A
  • thyrohyoid
  • sternothyroid
  • sternohyoid
  • omohyoid
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13
Q

action of the temporalis

A

elevate mandible

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14
Q

action of the masseter

A

elevation and protrusion of mandible

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15
Q

action of the medial pterygoid

A

elevate and protrude mandible

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16
Q

action of the lateral pterygoid

A
  • protude and depress mandible
  • lateral deviation of mandible (unilaterally)
17
Q

What muscles depress the hyoid? What are their innervations?

A

infrahyoid muscles
- innervated by branches of C1-C3

18
Q

What muscles elevate the hyoid?

A

suprahyoid muscles

19
Q

action of the diagastric

A

depresses mandible against resistance and elevates hyoid

20
Q

opening ROM

A

35-50 mm
- 3 fingers

21
Q

lateral deviation ROM

A

10-15 mm

22
Q

protrusion ROM

A

3-6 mm

23
Q

retrusion ROM

A

3-4 mm

24
Q

resting and closed packed position of TMJ

A

resting - slight opening (tongue resting on roof of mouth)

closed-packed - fully closed

25
Q

MOI of masticatory muscle disorders

A
  • strain/direct trauma
  • overuse injury (grinding, nail binding, etc)
  • central mediated pain
26
Q

physical exam findings of masticatory muscle disorders

A
  • tenderness and increased turger of muscles
  • limited ROM - painful at end range
  • pain with resistance testing
  • pain w/ tongue depressor biting on ipsilateral side
27
Q

general physical exam findings of joint dysfunction

A
  • perauricular (ear) pain commonly primary complaint
  • painful palpation of joint line
  • pain w/ compressive load joint testing
28
Q

disc dysfunction with reduction physical exam findings

A
  • audible clincking and/or palpable clicking
  • ROM intact
29
Q

disc dysfunction without reduction physical exam findings

A
  • report catching sensation with opening/closing
  • limitations in opening ROM
30
Q

pathomechains of c-type curve

A
  • anteior displacement of a disc (ipsilaterally) w/o reduction OR unilateral muscle hypomobility
  • hypomobility of ipsilateral joint
31
Q

pathomechains of s-type curve

A
  • muscular imbalance or medial displacement
  • condyle “walks around the disc”
32
Q

Biomechanics of early and late deviation

A

early - spasm

late - capsulitis/tight capsule

33
Q

What is happening when there is a click during opening?

A

reduction of the disc as the mandibular condyle passes over the posterior border

34
Q

What is happening when there is a reciprocal click during opening and closing?

A

Condyle slips posteriorly over (anteriorly) displaced disc
- clicking occurs with closing

35
Q

T/F: DDWOR do not see a ROM limitation

A

false - usually see a potential ROM limitation

36
Q

What curve is expected with DDWOR?

A

C curve

37
Q

What may be the issue if the patient reports crepitus?

A

joint dysfunctions

MSK 3 (13 decks)

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