Anatomy & Biomechanics of Extremities Flashcards
7 cards from real CCEP practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
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The acromioclavicular joint is reinforced primarily by which ligaments that provide vertical and horizontal stability respectively?
Answer: Coracoclavicular and acromioclavicular ligaments
The coracoclavicular ligaments (trapezoid and conoid) provide vertical stability, while the acromioclavicular ligaments provide horizontal (anteroposterior) stability.
The Q-angle of the knee is measured between the line of pull of the quadriceps and which other line?
Answer: The line from the tibial tubercle through the center of the patella to the ASIS
The Q-angle is the angle between the quadriceps force vector (ASIS to patellar center) and the patellar tendon line (patellar center to tibial tubercle); normal is approximately 10–18°.
The interosseous membrane of the forearm primarily transfers axial loads from which bone to which bone?
Answer: Radius to ulna (proximal to distal)
The fibers of the interosseous membrane run obliquely, transferring compressive loads from the radius (which receives ~80% of wrist forces) proximally to the ulna.
Which extensor tendon compartment of the wrist contains the extensor pollicis longus, and its abrupt change in direction around Lister's tubercle predisposes it to what complication?
Answer: Third compartment; spontaneous rupture
The EPL occupies the third compartment and wraps around Lister's tubercle, which acts as a pulley; this sharp change in direction can cause attritional or spontaneous rupture.
When assessing ankle dorsiflexion range of motion with the knee extended versus knee flexed, a restriction only with knee extended suggests tightness in which structure?
Answer: Gastrocnemius muscle
Because the gastrocnemius crosses the knee joint, dorsiflexion restriction that improves when the knee is flexed (taking tension off the gastrocnemius) indicates gastrocnemius, not soleus, tightness.
The femoral neck angle of inclination (coxa vara vs. coxa valga) directly influences which mechanical parameter at the hip?
Answer: Abductor muscle moment arm and joint reaction force
The neck-shaft angle determines the moment arm of the abductors; coxa vara shortens the abductor moment arm, requiring greater muscle force and increasing joint reaction force.
The 'Boutonnière deformity' of the finger involves which combination of joint positions?
Answer: PIP flexion and DIP hyperextension
Boutonnière deformity involves PIP flexion with DIP hyperextension, caused by disruption of the central slip allowing lateral bands to migrate volarly at the PIP.