Which statement correctly defines closed-pack and loose-pack joint positions and their relevance to adjustments?

• A. Closed-pack is neutral with maximal joint play; loose-pack is maximal congruence.
• B. Loose-pack is neutral; closed-pack is maximal joint play.
• C. Closed-pack is when joint surfaces are maximally congruent with taut ligaments; loose-pack is a neutral position with maximal joint play; adjustments are often performed in loose-pack.
• D. Loose-pack is when ligaments are taut.

Answer: (C)

The essential idea is how joint position changes stability and freedom of movement. In a closed-pack position, the joint surfaces fit together as tightly as possible and the ligaments around the joint are taut. This creates maximal stability with very little joint play, meaning the joint is resistant to distraction or separation. In contrast, the loose-pack position has the greatest potential for separation: the joint surfaces are not as congruent, the capsule and ligaments are lax, and joint play is maximal. This lax, more neutral position is where manual adjustments are easier and safer because the joint can be mobilized with less resistance. The statement that defines closed-pack as maximal congruence with taut ligaments, and loose-pack as a neutral position with maximal joint play, where adjustments are often performed, accurately reflects how these positions relate to adjustments.