Understanding AC Joint Sprains 💡
1. A Type II Acromioclavicular (AC) joint sprain involves which of the following?
- Partial tear of the AC ligaments with no clavicle displacement
- Complete rupture of the AC ligaments with partial damage to the coracoclavicular (CC) ligaments, leading to mild clavicle elevation
- Complete rupture of both AC and CC ligaments with significant clavicle displacement
- Dislocation of the clavicle from the acromion, requiring surgical intervention
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Correct Answer:
B. Complete rupture of the AC ligaments with partial damage to the coracoclavicular (CC) ligaments, leading to mild clavicle elevation.
Quick Guide: Understanding AC Joint Injury Grading
Type I: AC ligament sprained, but joint, CC ligament, deltoid, and trapezius remain intact.
Type II: AC ligament torn, joint widened, CC ligament sprained, possible partial detachment of deltoid/trapezius.
Type III: AC joint dislocated, clavicle displaced superiorly, CC ligament disrupted, high chance of deltoid/trapezius detachment.
Severe Dislocations (Types IV-VI):
Type IV: Clavicle displaced posteriorly into trapezius, ligaments torn, deltoid/trapezius likely detached.
Type V: Extreme clavicle elevation, complete CC ligament rupture, widened CC interval, deltoid/trapezius detachment.
Type VI: VI: Clavicle displaced inferior to the acromion, CC ligament completely torn, deltoid/trapezius detached.
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