Obturator Nerve Pain: A Rare Cause of Groin Pain in Athletes

Groin pain is common in athletes, especially in sports involving sprinting, sudden changes of direction, or kicking. Muscle strains are the usual cause, but obturator nerve entrapment is another. Less well known, it causes ongoing obturator nerve pain that’s hard to diagnose without careful assessment.

Obturator nerve entrapment is one of several causes of groin nerve pain.

What is the obturator nerve?

The obturator nerve comes from the lumbar spine and travels through the pelvis into the inner thigh. It passes through the obturator foramen and divides into two branches: the anterior branch supplies the adductor longus, brevis, and gracilis muscles plus sensation to the inner thigh; the posterior branch supplies the adductor magnus and the back of the knee joint.

When the nerve is irritated or compressed — obturator nerve entrapment — it causes groin and adductor pain, weakness, and loss of function. Causes include fascial thickening around the adductors and pelvic or hip pathology, such as cysts or growths.

Symptoms of obturator nerve pain

Athletes with obturator nerve entrapment often describe:

Aching or burning pain in the inner thigh or groin, usually triggered by running

Pain worsens with sprinting, side-steps, or kicking.

Weakness of the inner-thigh muscles (adductors)

Numbness and tingling in the inner thigh

A feeling of the leg “not working properly”

Relief almost immediately with rest

Sometimes the pain spreads into the knee or feels as though it comes from the hip.

Clinical assessment

A sports doctor takes a history and examines to distinguish a muscular cause from a nerve cause. Signs suggesting obturator nerve entrapment include:

Tenderness along the inner thigh near the nerve’s course

Weakness: Squeezing the legs together (adduction)

Pain is reproduced by stretching the inner thigh.

No significant signs of osteitis pubis, hip joint pathology, stress fracture, hernia, or urological problems

Systematically excluding the other causes of athletic groin pain is essential.

Investigations

Because obturator nerve pain mimics other groin causes, investigations often help:

MRI scan to rule out hip joint, pubic symphysis, or muscle injury — it may also show adductor wasting or pelvic masses

Ultrasound to look for nerve compression or scar tissue, and to exclude an inguinal or femoral hernia.a

Nerve conduction studies (EMG) to check obturator nerve function, though not always needed

Diagnostic injection — an ultrasound-guided anaesthetic block around the nerve; abolishing the pain confirms the source.

How do we treat obturator nerve entrapment?

Most cases start with conservative care:

Rest and load management — reduce sprinting, side-step drills, and kicking until symptoms settle

Physiotherapy — stretch and strengthen the hip and groin, and correct biomechanics

Medication — NSAIDs for short-term relief; neuromodulators such as amitriptyline or duloxetine for ongoing nerve pain

Ultrasound-guided injection — cortisone or nerve hydrodissection around the nerve to reduce inflammation and release pressure. We inject the anterior and posterior branches near the obturator foramen, using local anaesthetic, 5% dextrose, and a small dose of cortisone — a nerve hydrodissection Dr Masci teaches across the UK and Europe.

Surgery — rarely needed, but surgical decompression is an option in stubborn cases

Frequently asked questions about obturator nerve entrapment

What does obturator nerve pain feel like?

Aching or burning pain in the inner thigh and groin, brought on by running, sprinting, side-stepping, or kicking, sometimes with adductor weakness or a “leg not working” feeling. It typically eases quickly with rest.

How is obturator nerve entrapment different from a groin strain?

A groin (adductor) strain usually improves with rest and standard rehab; obturator nerve pain often doesn’t, and tends to carry nerve features such as numbness, tingling, or burning. A diagnostic nerve block helps tell them apart.

Is obturator nerve entrapment linked to osteitis pubis?

Yes. It’s often seen alongside pubic overload or osteitis pubis, particularly in sports with repeated twisting and change of direction.

Can obturator nerve entrapment be cured without surgery?

Usually, most athletes recover with load management, physiotherapy, and an ultrasound-guided injection where needed. Surgery is reserved for the few who don’t respond.

Final word from Sport Doctor London about obturator nerve entrapment

Obturator nerve entrapment is an uncommon but important cause of persistent groin pain in athletes. Unlike a muscle strain, it often doesn’t improve with rest or standard rehab alone. With careful diagnosis, targeted physiotherapy, and guided injections, most athletes recover fully and return to sport.

To book a one-stop assessment with Dr Masci in London, contact the team here or call +44 (0) 203 488 0350.