Question

what is the arthrokinematics of closed chain hip flexion (anterior pelvic tilt)?
anterior roll, anterior glide
anterior roll, posterior glide
posterior roll, posterior glide
posterior roll, anterior glide

Explanation:

In closed - chain hip flexion (anterior pelvic tilt), the arthrokinematics involve the femur (in a closed - chain situation, the femur is relatively fixed and the pelvis moves). As the pelvis tilts anteriorly (hip flexion in closed - chain), the femoral head (which is part of the relatively fixed femur in this case) has an anterior roll (as the pelvis moves over the femoral head) and a posterior glide (to maintain joint congruency). This is based on the principles of joint arthrokinematics where for a roll in one direction, there is usually a glide in the opposite direction to prevent impingement.

Answer:

Anterior roll, posterior glide