Femoral Hernia: Causes, Symptoms, Risks, and Surgical Treatment

What Is a Femoral Hernia?

An abdominal hernia occurs when a portion of an internal organ, most commonly the small intestine, or fatty tissue pushes through a weak point in the abdominal wall. This creates a visible or palpable bulge under the skin.

In the case of a femoral hernia, also called a crural hernia, the herniated content protrudes below the inguinal ligament. This ligament is the fibrous band running between the anterior superior iliac spine and the pubic bone. The hernia then appears on the anterior (front) surface of the upper thigh, near the groin.

How Common Is It?

Femoral hernias are the least common type of abdominal hernia, accounting for approximately 2% of all hernia cases. Unlike inguinal hernias, which predominantly affect men, femoral hernias are significantly more common in women. This is largely due to anatomical differences: the female pelvis is wider, creating a broader femoral canal that is more susceptible to herniation. Conversely, the inguinal ligament in women is partly obliterated, making inguinal hernias less likely to develop.

Important note: In men, a femoral hernia is frequently associated with a concurrent inguinal hernia, and both should be evaluated together.

Overview of Outcomes

The prognosis for femoral hernia is generally excellent with timely surgical treatment. However, femoral hernias carry a significantly higher risk of complications compared to inguinal hernias. Studies show that approximately 40% of women with a femoral hernia develop serious complications, such as incarceration or strangulation. This compares to roughly 25% of patients with an inguinal hernia. This is largely due to the narrow anatomical space of the femoral canal.

For this reason, early diagnosis and prompt surgical repair are especially critical for femoral hernias.

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Causes

A femoral hernia develops at weak points in the abdominal wall. These areas lack muscular coverage and are made up mostly of fibrous connective tissue. These areas can give way under increased intra-abdominal pressure, allowing internal content to push through.

Key Anatomical Concepts

Understanding the anatomy of a hernia requires familiarity with three key terms:

• Hernia gate (porta erniaria): The anatomical opening or defect through which the herniated content passes. In a femoral hernia, this gate is located in the femoral canal, in close proximity to the femoral artery and vein.
• Hernia sac (sacco erniario): The pouch formed by the peritoneum (the membrane lining the abdominal cavity) that encloses the herniated organ or tissue.
• Hernia neck (colletto): The narrowest part of the hernia at the level of the hernia gate. This area is the most critical zone, as compression and strangulation can occur here.

The proximity of the femoral hernia gate to the femoral vessels means the available space is extremely narrow. This anatomical constraint is a key reason why so many patients develop incarceration and strangulation. The herniated bowel can become compressed, causing it to rapidly lose its blood supply.

Risk Factors for Femoral Hernia

Risk factors for femoral hernia share two common mechanisms: increased intra-abdominal pressure and weakening of the abdominal muscular wall. These include:

Conditions that increase intra-abdominal pressure:

• Advancing age (tissue elasticity decreases over time)
• Obesity (excess abdominal fat raises pressure)
• Intense or repetitive physical effort (heavy lifting, prolonged straining)
• Chronic constipation (repeated straining during bowel movements)
• Pregnancy (multiple pregnancies progressively weaken the abdominal wall)
• Chronic cough (e.g., smokers, patients with COPD)

Conditions that weaken the abdominal wall:

• Laxity of the anterior abdominal wall muscles
• Previous abdominal surgery that has left scar tissue in fibrous structures (scar tissue is less elastic and may predispose to hernia formation)
• Genetic connective tissue disorders (e.g., Marfan syndrome, Ehlers-Danlos syndrome)

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Symptoms

Similarly to an inguinal hernia, a femoral hernia typically presents as:

• A bulge or lump in the groin area or at the top of the inner thigh.
• That is reducible; gentle pressure can push the herniated content back into the abdominal cavity.
• That is not painful, at least in the early stages.

The bulge of a femoral hernia may fluctuate in size throughout the day, depending on changes in intestinal pressure. It tends to disappear when lying down, as gravity no longer acts on the herniated content.

However, unlike inguinal hernias, which often have a long asymptomatic period, femoral hernias tend to cause symptoms early or progress quickly to complications. A significant proportion of patients are diagnosed only when complications have already occurred.

Clinical pearl: A groin lump in a woman that appears below the inguinal ligament is a femoral hernia until proven otherwise. Any new groin swelling in an adult should be evaluated by a doctor.

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Risks and Dangers

Femoral hernias are more dangerous than inguinal hernias because of their narrow hernia gate and their tendency to progress rapidly to serious complications. These complications can develop quickly. In some cases, they may even be present at the time of first diagnosis.

Incarcerated Hernia

An incarcerated hernia occurs when the herniated content (usually bowel) becomes trapped outside the abdominal cavity due to adhesions forming at the hernia gate. The organ can no longer be manually reduced back into the abdomen. Although blood supply may initially remain intact, this is a high-risk condition that can rapidly progress to strangulation.

Strangulated Hernia

A strangulated hernia is a surgical emergency. It occurs when blood flow to the trapped bowel segment is cut off, leading to ischemia and necrosis (tissue death) of that portion of intestine.

If not treated urgently, intestinal necrosis can cause:

• Bowel perforation
• Peritonitis (infection spreading through the abdominal cavity)
• Sepsis
• Shock and rapid deterioration of the patient’s general condition

Emergency surgery is required within 4 to 6 hours of suspected strangulation to prevent irreversible bowel damage and life-threatening systemic complications.

The rate of incarceration and strangulation is substantially higher in femoral hernias than in inguinal hernias. Specifically, it reaches approximately 40% compared to much lower rates in inguinal hernias. 25%, so clinical guidelines recommend against watchful waiting. Instead, they favor early surgical repair, even in asymptomatic patients.

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Diagnosis

In the majority of cases, the diagnosis of a femoral hernia is clinical, meaning it is based on:

• Medical history (anamnesis): The physician will ask about the onset, location, and evolution of symptoms, prior surgeries, and relevant medical history.
• Physical examination: The doctor will assess the location, consistency, size, and reducibility of the bulge. The examination is typically performed both in the supine (lying) and standing positions, and may include a cough test to accentuate the hernia.

Imaging Studies

If diagnostic doubt remains after the clinical evaluation, the following investigations may be ordered:

• Ultrasound (echography): The first-line imaging modality for suspected femoral hernia. It characterizes the hernia contents, confirms reducibility, and assesses blood flow to the herniated tissue. This step is critical for ruling out strangulation.
• CT scan (TAC): Indicated in complex or equivocal cases, or when complications (e.g., bowel obstruction) are suspected. Provides detailed anatomical information.
• MRI (Magnetic Resonance Imaging): Reserved for selected cases where CT findings are inconclusive or when radiation exposure should be minimized.

Differential diagnosis: Femoral hernias must be distinguished from other causes of groin swelling, including inguinal hernia, lymphadenopathy (enlarged lymph nodes), femoral artery aneurysm, lipoma, and abscess. Imaging is particularly helpful in this regard.

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Surgical Treatment

Surgery is the only definitive treatment for a femoral hernia. Conservative management (e.g., wearing a truss) is not recommended, as it does not repair the underlying defect and may mask the progression toward dangerous complications.

Given the high risk of incarceration and strangulation associated with femoral hernias, clinical guidelines recommend prompt surgical repair, even in asymptomatic patients.

• Asymptomatic hernia: Elective surgery should be scheduled within the following weeks, without prolonged delay.
• Strangulated hernia: Emergency surgery must be performed within 4–6 hours of onset to prevent irreversible bowel damage.

Surgical Techniques

The surgical repair of a femoral hernia is called hernioplasty. The most commonly used technique is open (traditional) surgery.

Laparoscopic hernioplasty is used less frequently for femoral hernia repair compared to inguinal hernia repair. This is because the femoral hernia gate is located in a deeper and more constrained anatomical space, making laparoscopic access more technically challenging.

Preparing for Surgery

In the days before the operation, a pre-admission assessment is performed, which includes:

• Blood tests: Complete blood count, coagulation studies, metabolic panel, and blood typing.
• Anesthesiological consultation: The anesthesiologist reviews the results and evaluates the patient’s fitness for anesthesia.
• Medication review: It is essential to inform the surgical team of all medications being taken, particularly anticoagulants (e.g., warfarin, rivaroxaban) and antiplatelet agents (e.g., aspirin, clopidogrel), which may need to be temporarily discontinued before surgery.
• Additional tests: Chest X-ray and ECG (electrocardiogram) may be required depending on the patient’s age and clinical condition.

Bowel preparation (laxatives or enemas) is generally not required for femoral hernia repair, unless specifically requested by the surgeon in cases involving the bowel.

Patients should fast for at least 6–8 hours before the procedure, meaning no food or fluids during that time.

Anesthesia

Femoral hernia repair is most commonly performed under general anesthesia. However, based on the patient’s clinical profile and surgeon preference, alternative anesthetic approaches may be considered:

• Local anesthesia: Used in selected low-risk patients undergoing straightforward open repairs.
• **Spinal anesthesiaable for open repairs.
• Epidural anesthesia: Administered via a catheter, allowing continuous intraoperative and post-operative pain control.

A multicenter randomized trial published in The Lancet (Nordin et al., 2003) found no significant differences in outcomes between local, regional, and general anesthesia for groin hernia repair, supporting the use of the technique best suited to each individual patient.

How Long Does the Operation Take?

The typical duration of femoral hernia surgery is 30 to 60 minutes, though this may vary depending on:

• The size and complexity of the hernia
• Whether complications such as bowel incarceration or strangulation are present
• Patient anatomy and body habitus

Emergency operations for strangulated hernias tend to be longer and more complex due to the need to assess bowel viability and potentially resect necrotic tissue.

How the Operation Is Performed

In most cases, femoral hernia repair is performed as a day-surgery procedure, meaning the patient is discharged on the same day as the operation.

Overnight hospital stay may be recommended in cases of:

• Urinary retention (difficulty urinating post-operatively)
• Significant post-operative pain requiring closer monitoring
• Persistent nausea or vomiting
• Multiple comorbidities, particularly in frail or elderly patients

If the hernia has developed complications, a more complex surgical intervention is needed. The surgeon will carefully inspect the herniated bowel to assess its viability. If necrotic (non-viable) segments are found, they must be surgically removed (resected). In these cases, hospitalization extends to at least 4–5 days, and patients may require a temporary or permanent bowel diversion (stoma) depending on the extent of resection.

Open Surgery

The open surgical technique for femoral hernia repair proceeds as follows:

1. Skin incision: A cut of generally less than 10 cm is made just below the inguinal ligament, on the anterior (front) surface of the upper thigh, directly over the hernia sac.
2. Dissection and identification: The surgeon carefully dissects through the subcutaneous tissue to expose the hernia sac, taking care to avoid the adjacent femoral artery and vein.
3. Reduction: The herniated content (intestine or fatty tissue) is gently pushed back into the abdominal cavity.
4. Mesh placement: A small synthetic mesh (prosthesis) is cut and shaped to fit the patient’s anatomy, then secured with sutures to reinforce the femoral canal and prevent recurrence.
5. Wound closure: The incision is closed in anatomical layers.

The proximity of the femoral vessels to the surgical field requires particular care and technical precision, which is why femoral hernia repair is considered more demanding than inguinal hernia repair.

Is It Painful?

• During surgery: Anesthesia effectively eliminates any perception of pain.
• In the first few days after surgery: Post-operative discomfort is typically mild to moderate and is well-controlled with prescribed analgesic medications.
• Long-term: Most patients experience a progressive reduction in discomfort over the first two weeks. Chronic post-operative pain is a known but relatively uncommon complication (see below).

After Surgery

Post-operative recovery guidelines:

• Activity restrictions: Avoid heavy lifting and strenuous physical effort for 4 weeks after surgery.
• Return to work: Most patients can resume sedentary or light-duty work within 2–3 days, provided no excessive physical exertion is required.
• Light exercise: Low-impact aerobic activities such as walking are generally permitted shortly after surgery.
• Eating and drinking: In most cases, patients can resume oral intake (both fluids and food) on the same day as the operation.
• Sexual activity: A brief period of abstinence is recommended in the first few days post-operatively. A gradual, comfortable return is generally safe and without expected complications.

Follow-up appointment: An outpatient visit with the surgeon will be scheduled in the weeks following discharge to:

• Assess the healing process and post-operative recovery
• Remove sutures (if non-absorbable sutures were used)
• Discuss any concerns or unexpected symptoms

Complications and Surgical Risks

Complications of femoral hernia repair are more frequent than those of inguinal hernia repair, largely because a higher proportion of operations are performed as emergency procedures. This urgency introduces additional risks, such as less optimal patient preparation, compromised bowel, and greater surgical complexity.

Specific Complications of Femoral Hernioplasty

General Surgical Complications

• Wound infection or hematoma
• Seroma (fluid collection under the skin)
• Deep vein thrombosis (DVT)
• Pulmonary embolism
• Cardiac complications (particularly in patients with pre-existing cardiovascular disease)

The overall complication rate is substantially higher when surgery is performed in an emergency setting than during elective repair. This difference reinforces the importance of early diagnosis and timely intervention.

When to Call Your Doctor

After returning home following surgery, contact your doctor immediately or go to the emergency department if you experience any of the following:

• Fever, particularly if it is persistent or exceeds 38°C (100.4°F).
• Urinary problems, including urinary retention, burning, or inability to urinate.
• Severe or worsening abdominal pain that does not improve with pain medication
• Wound discharge, particularly if it is cloudy, yellow, green, or foul-smelling, may indicate signs of infection.
• Swelling of the legs and/or ankles, which may indicate deep vein thrombosis.
• Shortness of breath or chest pain, which may indicate pulmonary embolism.
• Persistent nausea and vomiting that prevents eating or drinking
• New or returning bulge at the surgical site, which may indicate hernia recurrence.

Do not delay seeking medical attention if you are concerned. Early intervention prevents minor complications from becoming serious emergencies.

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Sources and Bibliography

• Scott NW, McCormack K, Graham P, et al. Open mesh versus non-mesh for repair of femoral and inguinal hernia. Cochrane Database Syst Rev 2002; :CD002197.
• Dahlstrand U, Wollert S, Nordin P, et al. Emergency femoral hernia repair: a study based on a national register. Ann Surg 2009; 249:672.
• Nordin P, Zetterström H, Gunnarsson U, Nilsson E. Local, regional, or general anaesthesia in groin hernia repair: multicentre randomised trial. Lancet 2003; 362:853.
• HerniaSurge Group. International guidelines for groin hernia management. Hernia 2018; 22:1–165.
• Simons MP, et al. European Hernia Society guidelines on the treatment of inguinal hernia in adult patients. Hernia 2009; 13:343–403.