After reduction of the prolapse, a subcutaneous suture (a stich under the skin) or other material is placed encircling the anus, which is then made taut to prevent further prolapse. Placing silver wire around the anus first described by Thiersch in 1891. Materials used include nylon, silk, silastic rods, silicone, Marlex mesh, Mersilene mesh, fascia, tendon, and Dacron. This operation does not correct the prolapse itself, it merely supplements the anal sphincter, narrowing the anal canal with the aim of preventing the prolapse from becoming external, meaning it remains in the rectum. This goal is achieved in 54-100% cases. Complications include breakage of the encirclement material, fecal impaction, sepsis, and erosion into the skin or anal canal. Recurrence rates are higher than the other perineal procedures. This procedure is most often used for people who have a severe condition or who have a high risk of adverse effects from general anesthetic, and who may not tolerate other perineal procedures. Internal rectal intussusception
Internal rectal intussusception (rectal intussusception, internal intussusception, internal rectal prolapse, occult rectal prolapse, internal rectal procidentia and rectal invagination) is a medical condition defined as a funnel shaped infolding of the rectal wall that can occur during defecation.This phenomenon was first described in the late 1960s when defecography was first developed and became widespread. Degrees of internal intussusception have been demonstrated in 40% of asymptomatic subjects, raising the possibility that it represents a normal variant in some, and may predispose patients to develop symptoms, or exacerbate other problems.
Solitary rectal ulcer syndrome and colitis cystica profunda
Solitary rectal ulcer syndrome (SRUS, SRU), is a disorder of the rectum and anal canal, caused by straining and increased pressure during defecation. This increased pressure causes the anterior portion of the rectal lining to be forced into the anal canal (an internal rectal intussusception). The lining of the rectum is repeatedly damaged by this friction, resulting in ulceration. SRUS can therefore be considered to be a consequence of internal intussusception (a sub type of rectal prolapse), which can be demonstrated in 94% of cases. It may be asymptomatic, but it can cause rectal pain, rectal bleeding, rectal malodor, incomplete evacuation and obstructed defecation (rectal outlet obstruction). Symptoms
Symptoms include:
Straining during defecation
Mucous rectal discharge
Rectal bleeding
Sensation of incomplete evacuation (tenesmus)
constipation, or more rarely diarrhea
fecal incontinence (rarely)

Prevalence
The condition is thought to be uncommon. It usually occurs in young adults, but children can be affected too. Cause
The essential cause of SRUS is thought to be related to too much straining during defecation. Overactivity of the anal sphincter during defecation causes the patient to require more effort to expel stool. This pressure is produced by the modified valsalva manovoure (attempted forced exhalation against a closed glottis, resulting in increased abdominal and intra-rectal pressure). Patiest with SRUS were shown to have higher intra-rectal pressures when straining than healthy controls. SRUS is also associated with prolonged and incomplete evacuation of stool.More effort is required because of concomitant anismus, or non-relaxation/paradoxical contraction of puborectalis (which should normally relax during defecation).