obturator internus anatomy

Obturator Internus: Anatomy, Dysfunction and Symptoms

In pudendal neuralgia by Stephanie PrendergastLeave a Comment

By Stephanie A. Prendergast, DPT, MPT, Cofounder, PHRC Los Angeles

The Obturator Internus (OI) muscle is an external rotator and an abductor of the hip. It is also a pelvic floor muscle, with half of the muscle belly sitting right next to our Levator Ani muscles. The muscle also forms part of Alcokc’s Canal, which houses the perineal branch of the pudendal nerve.

 

Even though the OI is part of the pelvic floor, it is not innervated by the pudendal nerve like the other pelvic floor muscles. It is innervated by the OI nerve, coming from spinal segments L5 – S2.

 

Impairments of the OI muscle are common in people with pelvic floor dysfunction. The muscle can become tight, weak, and develop trigger points. The impairments can lead to pain at the tailbone, sit bones, buttock area, and anywhere in the distribution of the pudendal nerve.

Consequences of OI Dysfunction Pt1

 

The Obturator Internus muscle is unique because it is an external rotator and abductor of the hip and it is also considered to be part of the pelvic floor muscle group. The muscles makes a 90 degree angle around our sit bones, it is innervated by the obturator nerve, and it forms part of Alcock’s Canal which houses the pudendal nerve.

 

When this muscle is impaired it can cause pain at the tailbone, around the sit bone, and the posterior thigh. It is associated with hip dysfunction and gluteal, groin and hip pain. Because of its close proximity to the Levator Ani muscles many people with pelvic floor pain also have Obturator Internus pain.

 

Weakness and/or tightness in the Obturator Internus muscles is associated with biomechanical abnormalities which can affect our lower extremity and core function. This muscle can be accessed transvaginally and transrectally and a portion of it is also able to be palpated externally. It is common for this muscle to develop trigger points due to its unique anatomy and the physical demands on it.

 

Manual physical therapy, neuromuscular re-education, and home exercises are effective tools to help this muscle function normally and reduce pain and dysfunction!

Consequences of OI Dysfunction Pt2

 

The Obturator Internus fascia form’s Alock’s Canal, which houses the pudendal nerve and vessels. When this muscle becomes overactive or too tight symptoms of pudendal neuralgia can develop. People may feel shooting, stabbing, burning, or itching in the genitals, perineum, and/ or anus.

Many people with OI dysfunction also have pelvic floor dysfunction (PFD) and may experience urinary urgency, frequency, pain, hesitancy, and/or leaking.

OI and PFD can also lead to difficulty evacuating stool, and pain before, during or after bowel movements.

OI myalgia can cause pain with sexual activity, including deeper vaginal pain during penetration and orgasm pain or difficulty.

It is important to remember that pelvic girdle muscles like the OI can also cause pelvic pain and dysfunction and the pelvic floor muscles are rarely the sole culprit!

 

obturator neuralgia symptoms

 

The Obturator Nerve arises from L2 – L4 and provides sensory and motor innervation to the inner thigh.

The Obturator Nerve is responsible for sensation from the upper medial thigh and plays a key role in hip adduction as it innervates multiple muscles in the inner thigh.

The Obturator Nerve is deep inside the pelvis, however, it can become impaired with athletic and surgical injuries, accidents, and pregnancy.

Symptoms of Obturator Neuralgia include medial thigh pain and muscle weakness.

Effective treatment includes pelvic floor physical therapy, nerve blocks, neuropathic medications, and in certain cases, surgical release.

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Are you unable to come see us in person in the Bay Area, Southern California or New England?  We offer virtual physical therapy appointments too!

Virtual sessions are available with PHRC pelvic floor physical therapists via our video platform, Zoom, or via phone. For more information and to schedule, please visit our digital healthcare page.

In addition to virtual consultation with our physical therapists, we also offer integrative health services with Jandra Mueller, DPT, MS. Jandra is a pelvic floor physical therapist who also has her Master’s degree in Integrative Health and Nutrition. She offers services such as hormone testing via the DUTCH test, comprehensive stool testing for gastrointestinal health concerns, and integrative health coaching and meal planning. For more information about her services and to schedule, please visit our Integrative Health website page

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FAQ

What are pelvic floor muscles?

The pelvic floor muscles are a group of muscles that run from the coccyx to the pubic bone. They are part of the core, helping to support our entire body as well as providing support for the bowel, bladder and uterus. These muscles help us maintain bowel and bladder control and are involved in sexual pleasure and orgasm. The technical name of the pelvic floor muscles is the Levator Ani muscle group. The pudendal nerve, the levator ani nerve, and branches from the S2 – S4 nerve roots innervate the pelvic floor muscles. They are under voluntary and autonomic control, which is a unique feature only they possess compared to other muscle groups.

What is pelvic floor physical therapy?

Pelvic floor physical therapy is a specialized area of physical therapy. Currently, physical therapists need advanced post-graduate education to be able to help people with pelvic floor dysfunction because pelvic floor disorders are not yet being taught in standard physical therapy curricula. The Pelvic Health and Rehabilitation Center provides extensive training for our staff because we recognize the limitations of physical therapy education in this unique area.

What happens at pelvic floor therapy?

During an evaluation for pelvic floor dysfunction the physical therapist will take a detailed history. Following the history the physical therapist will leave the room to allow the patient to change and drape themselves. The physical therapist will return to the room and using gloved hands will perform an external and internal manual assessment of the pelvic floor and girdle muscles. The physical therapist will once again leave the room and allow the patient to dress. Following the manual examination there may also be an examination of strength, motor control, and overall biomechanics and neuromuscular control. The physical therapist will then communicate the findings to the patient and together with their patient they establish an assessment, short term and long term goals and a treatment plan. Typically people with pelvic floor dysfunction are seen one time per week for one hour for varying amounts of time based on the severity and chronicity of the disease. A home exercise program will be established and the physical therapist will help coordinate other providers on the treatment team. Typically patients are seen for 3 months to a year.

What is pudendal neuralgia and how is it treated?

Pudendal Neuralgia is a clinical diagnosis that means pain in the sensory distribution of the pudendal nerve. The pudendal nerve is a mixed nerve that exits the S2 – S4 sacral nerve roots, we have a right and left pudendal nerve and each side has three main trunks: the dorsal branch, the perineal branch, and the inferior rectal branch. The branches supply sensation to the clitoris/penis, labia/scrotum, perineum, anus, the distal ⅓ of the urethra and rectum, and the vulva and vestibule. The nerve branches also control the pelvic floor muscles. The pudendal nerve follows a tortuous path through the pelvic floor and girdle, leaving it vulnerable to compression and tension injuries at various points along its path.

Pudendal Neuralgia occurs when the nerve is unable to slide, glide and move normally and as a result, people experience pain in some or all of the above-mentioned areas. Pelvic floor physical therapy plays a crucial role in identifying the mechanical impairments that are affecting the nerve. The physical therapy treatment plan is designed to restore normal neural function. Patients with pudendal neuralgia require pelvic floor physical therapy and may also benefit from medical management that includes pharmaceuticals and procedures such as pudendal nerve blocks or botox injections.

What is interstitial cystitis and how is it treated?

Interstitial Cystitis is a clinical diagnosis characterized by irritative bladder symptoms such as urinary urgency, frequency, and hesitancy in the absence of infection. Research has shown the majority of patients who meet the clinical definition have pelvic floor dysfunction and myalgia. Therefore, the American Urologic Association recommends pelvic floor physical therapy as first-line treatment for Interstitial Cystitis. Patients will benefit from pelvic floor physical therapy and may also benefit from pharmacologic management or medical procedures such as bladder instillations.

Who is the Pelvic Health and Rehabilitation Team?

The Pelvic Health and Rehabilitation Center was founded by Elizabeth Akincilar and Stephanie Prendergast in 2006, they have been treating people with pelvic floor disorders since 2001. They were trained and mentored by a medical doctor and quickly became experts in treating pelvic floor disorders. They began creating courses and sharing their knowledge around the world. They expanded to 11 locations in the United States and developed a residency style training program for their employees with ongoing weekly mentoring. The physical therapists who work at PHRC have undergone more training than the majority of pelvic floor physical therapists and as a result offer efficient and high quality care.

How many years of experience do we have?

Stephanie and Liz have 24 years of experience and help each and every team member become an expert in the field through their training and mentoring program.

Why PHRC versus anyone else?

PHRC is unique because of the specific focus on pelvic floor disorders and the leadership at our company. We are constantly lecturing, teaching, and staying ahead of the curve with our connections to medical experts and emerging experts. As a result, we are able to efficiently and effectively help our patients restore their pelvic health.

Do we treat men for pelvic floor therapy?

The Pelvic Health and Rehabilitation Center is unique in that the Cofounders have always treated people of all genders and therefore have trained the team members and staff the same way. Many pelvic floor physical therapists focus solely on people with vulvas, this is not the case here.

Do I need pelvic floor therapy forever?

The majority of people with pelvic floor dysfunction will undergo pelvic floor physical therapy for a set amount of time based on their goals. Every 6 -8 weeks goals will be re-established based on the physical improvements and remaining physical impairments. Most patients will achieve their goals in 3 – 6 months. If there are complicating medical or untreated comorbidities some patients will be in therapy longer.

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