MSK Injuries

Question 1

Anatomical snuff box tenderness

Answer 1

Scaffold fx

blood supply is distal to proximal, can get avascular necrosis –> painful arthritis

Question 2

difference between a dislocated and separated shoulder

Answer 2

dislocated: head of humorous out of glenoid cavity
separated: clavicle separates from acromion and coracoid process of scapula

Question 3

Posterior dislocation of hip

Answer 3

most common type of hip dislocation

Structures injured:
Medial and lateral circumflex femoral a. (feed femoral neck, off of deep femoral artery)
Femoral v.
Sciatic n.
head of femur

Question 4

Ligaments injured in inversion ankle sprain

Answer 4

1. anterior talofibular lig. (ATF)
2. calcaneofibular lig
3. posterior talofibular lig

Question 5

Ligament injured in eversion ankle sprain

Answer 5

deltoid ligament

Question 6

Unhappy triad of knee injury

Answer 6

Lateral force to knee while foot planted

1. MCL
2. ACL
3. either Lateral meniscus (56%) or medial meniscus (44%)

Question 7

Saturday Night Palsy

Answer 7

compression of the radial nerve against the spiral groove of humerus –> wrist drop, difficulty straightening fingers, numbness on back of hand and posterior arm

Question 8

Nerve damage associated with fracture of SHAFT of humerus

Answer 8

radial N.

Question 9

Proximal injury to ulnar n.

Answer 9

loss of flexion of wrist and digits

Question 10

distal injury to ulnar n.

Answer 10

“Ulnar claw” deformity
MCP joint hyperextension and IP joint flexion of 4th and 5th digits when trying to extend

weak abduction and adduction of digits
Hypothenar wasting

Question 11

Median nerve injury at elbow

Answer 11

“Ape hand” deformity - loss of thumb abduction

Question 12

Hand of benediction

Answer 12

Median n injury

loss of flexion of 2nd and 3rd digits when trying to make fist

Question 13

Carpal tunnel syndrome

Answer 13

Median n injury
-numbness of first 3 1/2 digits - worse at night or typing
entrapped by flexor retinaculum, aka transverse carpal ligament

Question 14

Musculocutaneous n pathology

Answer 14

decreased flexion and supination of forearm

Question 15

Axillary nerve damage, most common cause and sx

Answer 15

Anterior shoulder dislocation or fracture of SURGICAL NECK of humerus

loss of abduction, weak flexion, extension, rotation of shoulder
loss of sensation to lateral shoulder

Runs with posterior circumflex artery

Question 16

Long thoracic nerve pathology

Answer 16

blow to neck or shoulder or after radial mastectomy

causes winged scapula

Question 17

Pelvic fracture nerve damage

Answer 17

femoral n.

Question 18

anterior hip dislocation nerve damage

Answer 18

obturator n.

Question 19

posterior hip dislocation nerve damage

Answer 19

Superior and inferior gluteal n.

Question 20

Polio nerve damage

Answer 20

superior gluteal n.

Question 21

Trendelenburg sign

Answer 21

contralateral hip drops dt superior gluteal n damage causing weak gluteus medius

Question 22

nerve damage associated with posterior approach to hip replacement

Answer 22

Inferior gluteal n.

–> difficulty standing up or climbing stairs

Question 23

Sciatic nerve pathology

Answer 23

intervertebral disc herniation
spinal stenosis
spondylolithesis

Question 24

Nerve damage associated with generalized knee injury

Answer 24

tibial n.

Question 25

fracture to neck of fibula risks damage to this nerve

Answer 25

common fibular n.

Question 26

Nerve associated w/ Foot drop

Answer 26

common fibular n. and deep fibular n.

Question 27

chronic compression or habitual leg crossing damages this nerve

Answer 27

common fibular n.

Question 28

trauma to lateral knee damages this nerve

Answer 28

deep fibular n.