The elbow joint has six ossification centers that appear in a predictable sequence. What mnemonic describes the order of their appearance, and which center appears LAST?

• A CRITOE; olecranon appears last
• B ROCITE; external epicondyle appears first
• C All six centers appear simultaneously between ages 5–8
• D CRITOE (Capitellum, Radial head, Internal/medial epicondyle, Trochlea, Olecranon, External/lateral epicondyle); lateral epicondyle appears last (~11–12 years) ✓

Explanation

The mnemonic CRITOE describes the sequence of ossification of elbow epiphyses: Capitellum (1 yr), Radial head (3 yrs), Internal (medial) epicondyle (5 yrs), Trochlea (7 yrs), Olecranon (9 yrs), External (lateral) epicondyle (11 yrs). Each center appears approximately 2 years after the previous. This sequence is important for identifying fractures in children — an ossification center seen out of place (e.g., medial epicondyle avulsion pulled into the joint) can mimic an accessory ossicle. The lateral epicondyle appears last.

Reference: BD Chaurasia's Human Anatomy, 8th ed.

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Written and medically reviewed by the StethoPrep medical team.