See link to Screening Musculoskeletal Examination Videos:
PGALS (Pediatrics Gait, Arms, Legs and Spine)
Also see PGALS pdf handout
Reference: Foster HE, Kay LJ, Friswell M, Coady D, Myers A. Musculoskeletal screening examination (pGALS) for school-age children based on the adult GALS screen. Arthritis Care Research 2006; 55(5); 709–716.