Cottons fracture is fracture of
**Question:** Cottons fracture is fracture of
A. Radius
B. Ulna
C. Both bones
D. Colles' fracture
**Correct Answer:** C. Both bones
**Core Concept:** Cottons fracture is a specific type of distal radius and ulnar shaft fractures. These fractures occur due to a twisting force acting on the forearm while the forearm is in pronation. This results in a rotational force, causing both radius and ulna to break.
**Why the Correct Answer is Right:** Cottons fracture is the correct answer because it refers to the simultaneous fracture of the radius and ulna, which occurs due to the twisting force acting on the forearm. This type of fracture is named after Dr. William Cottons, who first described the injury in 1895.
**Why Each Wrong Option is Incorrect:**
A. Radius (Option A) is incorrect because Cottons fracture involves both the radius and ulna, not just the radius.
B. Ulna (Option B) is incorrect for the same reason as Option A; Cottons fracture involves both the radius and ulna.
C. Both bones (Option C) is the correct answer but is repeated in the correct answer (Option C).
D. Colles' fracture (Option D) is incorrect because Colles' fracture is a specific type of distal radius fracture, not a fracture involving both bones.
**Why Each Wrong Option is Incorrect:**
A. Radius (Option A) is incorrect because Cottons fracture involves both the radius and ulna, not just the radius.
B. Ulna (Option B) is incorrect for the same reason as Option A; Cottons fracture involves both the radius and ulna.
C. Both bones (Option C) is the correct answer but is repeated in the correct answer (Option C).
D. Colles' fracture (Option D) is incorrect because Colles' fracture is a specific type of distal radius fracture, not a fracture involving both bones.
**Clinical Pearl:** Cottons fracture is a challenging diagnosis to make due to the subtlety of the injury and the possibility of misdiagnosis as Colles' fracture. It is important for physicians to consider this injury in patients with a history of forearm trauma and suspected rotational force involved. A thorough clinical examination, including the presence or absence of swelling, deformity, and tenderness in the forearm, can aid in distinguishing Cottons fracture from Colles' fracture. Additionally, imaging studies like X-rays and CT scans can be helpful in confirming the diagnosis.