A surgical implant is provided for implantation into a body of a patient to treat a vaginal prolapse in the patient. The surgical implant is made of non-absorbable material and includes a knitted mesh having a mass density of less than 25 g/m2. The knitted mesh includes polypropylene strands having a diameter of less than about 600 μm, major spaces located between adjacent ones of the strands, the major spaces having a width of from about 1 mm to 10 mm, and pores located within the strands, the pores having a diameter of from about 50 μm to 200 μm. The knitted mesh is secured in place to treat the prolapse.