First Aid USMLE Step 1: MSK Questions and Correct Detailed Answers (Verified Answers) ||Already Graded A+||Newest Version

First Aid USMLE Step 1: MSK Questions and Correct
Detailed Answers (Verified Answers) ||Already
Graded A+||Newest Version
Quiz: Anterior drawer sign

Ans: Movement of tibia anterior relative to femur due to ACL injury



Quiz: Posterior drawer sign

Ans: Movement of tibia posterior relative to femur due to PCL injury



Quiz: Abnormal passive abduction

Ans: Movement of knee laterally (valgus) causes medial space widening of tibia due to
MCL injury



Quiz: Abnormal passive adduction

Ans: Movement of knee medially (varus) causes lateral space widening of tibia (LCL injury)



Quiz: McMurray Test

Ans: Knee externally rotated with pain/popping: medial meniscal tear

Knee internally rotated with pain/popping: lateral meniscal tear



Quiz: Unhappy triad

Ans: ACL, MCL, and medial meniscus injuries (although lateral meniscus injury is more
common)



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, Quiz: Prepatellar bursitis

Ans: Caused from repeated trauma or kneeling, otherwise known as "housemaid's knee"
(in front of knee, compared to Baker's cyst, which is behind the knee)



Quiz: Baker Cyst

Ans: Popliteal fluid collection commonly related to chronic joint disease (behind knee,
compared to prepatellar bursitis, which is in front of knee)



Quiz: Name the rotator cuff muscles and nerves that innervate them

Ans: Supraspinatus (suprascapular nerve), infraspinatus (suprascapular nerve), terres
minor (axillary nerve), subscapularis (upper and lower subscapular nerves)



Quiz: What branches of brachial plexus innervate rotator cuff muscles (supraspinatous,
infraspinatous, terres minor, subscapularis)

Ans: C5-C6



Quiz: Most common rotator cuff injury? How is it assessed

Ans: Supraspinatous (innervated by suprascapular nerve) assessed by empty/full can test



Quiz: Action of supraspinatous (rotator cuff innervated by suprascapular nerve)

Ans: Abducts arm (before deltoid action)



Quiz: Action of infraspinatous (rotator cuff innervated by suprascapular nerve)

Ans: Laterally rotates the arm


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, Quiz: Rotator cuff injury commonly hurt while pitching

Ans: Infraspinatous (suprascapular nerve)



Quiz: Action of terres minor (rotator cuff innervated by axillary nerve)

Ans: Adducts and laterally rotates arm



Quiz: Action of subscapularis (rotator cuff innervated by upper and lower subscapular
nerve)

Ans: Adducts and medially rotates arm



Quiz: Golfer's elbow

Ans: Medial epicondylitis due to repetitive flexion or idiopathic; pain near medial
epicondyle



Quiz: Pain near medial epicondyle

Ans: Medial epicondylitis



Quiz: Pain near lateral epicondyle

Ans: Lateral epicondylitis- tennis elbow due to repetitive extension



Quiz: Tennis elbow

Ans: Lateral epicondylitis due to repetitive extension or idiopathic; pain near lateral
epicondyle




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, Quiz: Name the carpal bones

Ans: Scaphoid, lunate, triquetrium, pisiform, hamate, capitate, trapezoid, triapezium



Quiz: Characteristics of scaphoid carpal bone (3)

Ans: Palpate in anatomic snuffbox

Most frequently fractured carpal bone

Prone to AVN due to retrograde blood supply



Quiz: Dislocation of what carpal bone can cause acute carpal tunnel syndrome

Ans: lunate



Quiz: FOOSH can damage which carpal bone and cause what nerve injury

Ans: Can damage hamate and cause ulnar nerve injury



Quiz: What nerve is affected in carpal tunnel syndrome?

Ans: Median (entrapped in carpal tunnel)



Quiz: Pain, paresthesia, numbness in distribution of median nerve often associated with
RF, pregnancy, hypothyroidism, and may be associated with repetitive use

Ans: Carpal tunnel syndrome



Quiz: Injury classically seen in cyclists

Ans: Guyon canal syndrome, which is compression of ulnar nerve at wrist or hand


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