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The Obturator Internus is a muscle of the gluteal region.
Anatomical Attachments: Action: Rotates the thigh laterally, abducts and extends the thigh when it is flexed.
Synergist: Lateral rotators of the thigh.
Nerve Supply: Muscular branches of the sacral plexus nerve (L5, S1).
Vascular supply: Internal pudendal and superior gluteal arteries.
Vascular entrapment: According to Travell and Simons, while unsupported by study, the pudendal nerve and the internal pudendal vessels could become entrapped as they pass through the obturator foramen and should be a consideration if an individual is experiencing dysesthesia or perineal pain.
Click on a small image to view an enlarged image Trigger Point Signs and Symptoms: A feeling of fullness in the rectum with some pain referring down the back of the ipsilateral thigh, possible electrical, twinging, or lancinating intervaginal pain.
Trigger Point Activating and Perpetuating Factors: Muscle strain, persistent emotional stress, direct trauma, or post surgical adhesions to the pelvic region.
Differential Diagnosis: (Segmental, Subluxation, Somatic dysfunction) L5 S1 S2 S3 S4 or S5 radiculopathy, Sciatica, Coccygodynia (coccygeal nerve compression), Coccygeal spasm, Coccygeal fracture, Levator syndrome, Tension myalgia of pelvic floor,
Pregnancy, Spontaneous Abortion (Miscarriage), Proctalgia fugax, Hemorrhoids, Polyps, Anal fissure, Colorectal cancer, Crohn’s Disease, Diverticular disease, Fecal impaction or Constipation, Proctitis, Prostatitis, Prostate cancer, Vaginismus, Cervical cancer, Vaginal or Intervaginal trauma, Systemic infections or inflammation, Nutritional inadequacy, Metabolic imbalance, Toxicity, Side effects of medication.
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Obturator Internus
Travell and Simons Trigger Point Pain Referral: