Fig 20B-9. Quadrilateral socket brim pattern variations, dependent upon residual limb musculature, most importantly the gluteals and rectus femoris. A, pattern for a residual limb of soft or average musculature. B, pattern for a residual limb of firm musculature. (From Radcliff CW: Artif Limbs 1955; 2:54-55. Used by permission.)