How ligament laxity diminishes striated muscle force? Upper image: Anatomy. If USLs are overstretched by length “E,” the uterus prolapses, LP and LMA lengthen by “E.” The wavy shape of LP and LMA indicate diminution of contractile strength. Lower image: Sarcomere (striated muscle fibres). A striated muscle contracts optimally of a short length only (L). Elongation of the muscle to “E” diminishes contractile force. USL, uterosacral ligament; LP, levator plate; LMA, conjoint longitudinal muscle of the anus.