Which statement correctly describes subluxation compared with dislocation?

Which statement correctly describes subluxation compared with dislocation?

• A. Subluxation involves partial displacement of the femoral head; dislocation involves complete displacement
• B. Subluxation involves complete displacement; dislocation involves partial displacement
• C. They refer to the same condition
• D. They involve only rotation without translation

Answer: (A)

Partial displacement is what defines subluxation, while dislocation means the joint surfaces lose contact entirely. In a subluxation, the bone has moved out of its normal position but still retains some articulation with the joint; some contact and alignment remain, and the joint may still function to a degree. In a dislocation, the bones are completely separated so the articular surfaces no longer touch, leading to a more dramatic loss of joint integrity and usually a need for prompt reduction. The statement that subluxation is partial displacement and dislocation is complete displacement captures this distinction precisely. The other options either swap the definitions, claim they’re the same, or describe a scenario that isn’t about displacement at all (rotation without translation), which isn’t accurate for these terms.

Partial displacement is what defines subluxation, while dislocation means the joint surfaces lose contact entirely. In a subluxation, the bone has moved out of its normal position but still retains some articulation with the joint; some contact and alignment remain, and the joint may still function to a degree. In a dislocation, the bones are completely separated so the articular surfaces no longer touch, leading to a more dramatic loss of joint integrity and usually a need for prompt reduction. The statement that subluxation is partial displacement and dislocation is complete displacement captures this distinction precisely. The other options either swap the definitions, claim they’re the same, or describe a scenario that isn’t about displacement at all (rotation without translation), which isn’t accurate for these terms.