horizontal abduction of shoulder or hip
Various web sites offer video demonstrations of joint movement. You may need to download a movie viewer to see these.
University of Michigan Learning Resource Center. (1994). Muscles in action. [On-line]. Available: http://www.med.umich.edu/lrc/Hypermuscle/Hyper.html.
Most students first learn to name extremity joint motions by using examples of open chain movement, in which the extremity's distal segment moves freely with respect to a relatively stable proximal segment.
We name "closed chain" motions identically. For example, hip flexion involves an approximation of the anterior surfaces of the pelvis and femur. When the pelvis tilts anteriorly (ASIS moves forward) on a fixed femur, the pelvis' anterior surface moves closer to the femur's anterior surface. Therefore, hip flexion is a joint movement that is associated with an anterior pelvic tilt.
When both the proximal and distal segments seem to move, classifying the joint movement as open or closed chain is difficult. For example, when one extends the knee joint to stand up from a sitting position, both the femur and tibia are in motion. We elect to consider it a closed chain motion because the lower extremity is fixed on the floor at its distal end. This choice helps us analyze gravitational and muscular forces at the knee joint because it leads us to draw the vectors that represent those forces on the mass that is superincumbent to the knee joint.