Lateral Compartment Muscles

Question 1

Where is the lateral compartment?

Answer 1

lateral surface of fibula, between anterior and posterior crural septa

Question 2

What muscles are in the lateral compartments?

Answer 2

Fibularis brevis
Fibularis longus
Superficial Fibular Nerve

Question 3

I have a zig zag directionaIity

I..

a) attach at the head of the fibula
b) 2/3 of the superolateral surface of the fibula
c) inferiorly/posteriorly to lateral mallelus
d) runs obliquelu and distally across sole of the foot to attach distally to first metarsal and medial cuneiform bone

Answer 3

Fibularis longus

Question 4

Describe the attachments of fibularis longus

Answer 4

attaches to fibular head, 2/3 of anterolateral surface
descends posteriorly and inferiorly to malleolus
crosses sole to attach to first metatarsal and medial cuneiform bone

Question 5

Plantar flexion, eversion, and complicated attachment nature

Answer 5

fibularis longus

Question 6

Groove for fibularis longus

Answer 6

on cuboid, but crosses to first metatarsal and medial cuneiform

Question 7

fibularis brevis. how is it different from longus?

Answer 7

proximal attachment is inferolateral 2/3 of tibial, and attaches to the dorsal surface of tuberosity on lateral side of fifth metatarsal

eversion and planterflexion

Question 8

5th metatarsal fractures, name them and describe them

Answer 8

Avulsion fracture inhibiting inversion, fibularis brevis/ and lateral band of plantar fascia

Jones fraction is non-inversion

and stress fracture

Question 9

5th metatarsal fractures by zone

zone 1

zone 2

zone 3

Answer 9

zone 1 -avulsion - IN STYLOID REGION
zone 2- jones - IN METAPHYSIS REGION
zone 3 - stress - IN DIAPHYSIS

Question 10

MATCH THE FRACTURE TO THE NAME

a fracture involving a tuberosity

an acute diaphyseal fracture

a diaphyseal stress fracture

Answer 10

1. avulsion fracture
2. acute diaphyseal fracture
3. diaphyseal stress fracture

Question 11

Superficial FIbular Nerve

Answer 11

runs between fibular muscles and lateral to extensor digitorum longus

becomes superficial in distal third of leg to supply:

a. anteroinferior leg
b. NEARLY ENTIRE DORSAL SURFACE OF THE FOOT
c. most of the dorsal aspect of the digits

Question 12

Superficial Fibular Nerve versus Deep Fibular Nerve

Answer 12

DFN runs between fibula and fibularis longus muscle, supplies anterior compartment muscles, ankle joint and metacarpal phalangeal joints, dorsal intrinsic foot muscles , skin between first and second digits

SFN runs between fibular and fibularis longus muscle, becomes superficial in distal third of leg to supply almost entire dorsal surface of the foot and most of the dorsal surface of the digits

Question 13

Common Fibular Nerve damage

Answer 13

results in foot drop, problems with eversion

high step gait, waddling gait, swing out gait

injury results in paralysis of lateral and anterior crural muscles

Question 14

What prevents “bowstringing” during dorsiflexion?

Answer 14

extensor retinaculum, extension of crural (leg) fascia

Question 15

Lateral Compartment arterial blood supply

Answer 15

branches that pass anteriorly from the fibular artery

the ONE compartment without a distinct arterial branch accompanying the compartment nerve

fibular artery = largest branch of posterior tibial artery

Question 16

Shin Splints

Answer 16

small tears in the periosteum over tibia

due to repetitive microtrauma of tibialis anterior

classified as a mild form of compartmental syndrome (swelling of tibialis anterior due to repetitive ground reaction force….differential tibial stress fracture