1st ray, 1st MPJ, lesser ray and MPJs

Question 1

The hallux bears weight for _____ of stance. First met during static stance carries _____% of body weight.

Answer 1

60%

40

Question 2

Axis of 1st ray

Answer 2

45% from frontal and 45% from sagittal

proximal-medial-dorsal to distal-lateral-plantar direction

Question 3

motion of 1st ray, total ROM

Answer 3

dorsiflexion-inversion-adduction
plantarflexion-eversion-abduction
plantarflexion and dorsiflexion main ones
5mm of dorsi and 5mm of plantarflexion=10mm

Question 4

Function of the first ray in gate

Answer 4

plantarflexion of the 1st ray during midstance and propulsion is necessary for proper 1st MPJ function allowing dorsiflexion in toe off

Question 5

What are the requirements for 1st ray’s function in gate?

Answer 5

supinated STJ, stable MTJ

Question 6

What can a hypermobile first ray lead to?

Answer 6

hallux abducto valgus, hallux limitus, metatarsus primus elevates and 2nd met overload

Question 7

What is the fxn of the 1st MPJ?

Answer 7

dorsiflexion allows smooth, effective propulsion of body during toe-off

Question 8

What are the motions of the 1st MPJ?

Answer 8

rolling, sliding with 1st ray plantarflexion, compression at end range of motion

Question 9

What does the 1st MPJ require for proper function during gait?

Answer 9

stability and plantarflexion of 1st ray-requires about 10 degrees of plantarflexion to facilitate 1st MPJ dorsiflexion
normal sesamoid fxn-act as pulleys
nl fx of 1st MPJ muscle stabilizers

Question 10

What is the 1st MPJs fxn in gait?

Answer 10

Midstance to toe-off
hinge motion for 1st 20 degrees
arthroidal motion-sliding motion with plantarflexion of 1st ray with heel lift, STJ supination and nl sesamoid fxn
dorsiflexion to end ROM during propulsion

Question 11

Where is the axis of motion of lesser rays?

Answer 11

just proximal to tarsometatarsal joint-pure dorsiflexion and plantarflexion

Question 12

What is the axis and motion of the 5th ray?

Answer 12

proximal/plantar/lateral to distal/dorsal/medial

dorsiflex/abduct/evert, plantarflex/adduct/invert

Question 13

What are the axes of lesser MPJs?

Answer 13

vertical-passive transverse motion

transverse-active sagittal plane motion

Question 14

What is the lesser MPJs fxn in gait? What is responsible for toe stabilization? Dorsiflexion?

Answer 14

dorsiflexion required during propulsion, toe stabilization against ground during propulsion is d/t FDB and FDL and assisted by IO and lumbricals
DF by EDL through sling