- Clinical science
A femoral hernia is an uncommon type of inguinal hernia, in which intra-abdominal contents (e.g., intraperitoneal fat, mesentery, bowels) herniate into the femoral canal through the femoral ring. Risk factors for femoral hernias include old age, female gender, obesity, and previous hernia repair. Patients present with a globular swelling inferior to the inguinal ligament and medial to the femoral vein that worsens with coughing or straining. The diagnosis is primarily clinical with ultrasonography being indicated if the diagnosis is inconclusive. Although femoral hernias are uncommon, they are associated with a high risk of incarceration and strangulation and should, therefore, be surgically treated as early as possible. The preferred treatment for non-complicated femoral hernias is mesh hernioplasty, while repair without a mesh is used for complicated femoral hernias.
- Uncommon hernia (∼ 5% of all hernias)
- Sex: ♀ > ♂ (3:1)
- Peak incidence: 40–70 years
Epidemiological data refers to the US, unless otherwise specified.
- Advancing age and female gender (see “Epidemiology” above)
- Increased intra-abdominal pressure
- Previous abdominal surgeries (especially those involving the inguinal region)
In contrast to indirect inguinal hernias, which may occur congenitally, femoral hernias are almost always acquired.
- Boundaries of the femoral canal
- Typical femoral hernia: (common): protrusion of intraperitoneal contents along with the transverse abdominal fascia through the femoral ring into the femoral canal
- Non-complicated femoral hernia
- Complicated femoral hernia: see “Complications” below
- A femoral hernia is primarily a clinical diagnosis.
- Groin ultrasound is used when the diagnosis is inconclusive (see “Differential diagnosis” below).
- Non-complicated femoral hernia: early elective surgical repair with mesh hernioplasty (tension-free repair)
- Complicated femoral hernia: (see “Complications” below): herniorrhaphy (non-mesh repair)
All femoral hernias should be surgically repaired because of the high risk of complications.
Incarceration: irreducible femoral hernia due to trapped hernia contents in hernia sac
- Richter hernia: herniation of only a part of the circumference of the bowel wall.
- Strangulation: ischemic necrosis of contents within the hernia sac as blood flow is compromised due to incarceration
Reduction of a strangulated hernia should not be attempted because generalized peritonitis would occur following reduction of strangulated bowel loops!
Although femoral hernias account for only about 5% of all hernias, they account for about 40% of all complicated hernias!
A femoral hernia should be considered among 40–70-year-old women presenting with signs of mechanical bowel obstruction!
We list the most important complications. The selection is not exhaustive.