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Atlas · Abdomen

Iliopsoas

Iliopsoas helps lift the thigh and links the front of the hip with the pelvis and lower back. Familiar groin pain during stairs, running or lifting the knee can involve this region, but the hip joint, nearby tendons and non-muscular conditions can cause similar symptoms. A hip examination is more useful than assuming that sitting has shortened the psoas.

Iliopsoas
Body region
Abdomen · Hip
Trigger points
3
documented in this muscle
Common symptoms
4
patterns cataloged
Contributors
4
Factors to assess

Muscle overview

Symptoms and first steps

Practical first steps

  • Temporarily reduce the running, kicking or leg-raise dose that reliably provokes symptoms.
  • Use comfortable walking and a tolerable hip-strengthening starting point.
  • Do not press a ball or device deeply into the abdomen or groin to release the psoas.

When to seek assessment

  • Urgent assessment is needed for severe abdominal/groin pain with fever, feeling unwell, or inability to bear weight.
  • Seek prompt assessment for new thigh numbness or weakness, a painful groin lump, or marked groin pain after trauma.
  • New severe groin/back pain while taking anticoagulants, especially with weakness or faintness, needs urgent assessment for bleeding.
  • Persistent pain or painful snapping after hip surgery should be reviewed by the treating team.

Control pelvic position when assessing hip extension. A thigh that stays above the table does not by itself diagnose a short psoas, and a Thomas test never confirms an iliopsoas trigger point.

Examination, palpation and treatment evidence

Illustrated overview

Iliopsoas

Blue highlights the muscle. Crosses mark representative trigger-point sites; shaded areas show possible referred pain. These examples do not correspond one-to-one with the numbered points below. Patterns vary and cannot diagnose the cause of pain.

Illustrated overview

Iliopsoas · Trigger-point examples 1

Representative source regions. The illustrated markers and pain pattern are not individual assignments to the numbered trigger points.

Open full-size image

Trigger points

1. TrP1

Location. Deep abdomen/pelvis to thigh

Trigger point map
Iliopsoas — Iliopsoas · Trigger-point examples 1Open full-size image

Regional muscle reference; this is not an individual map of the selected numbered trigger point.

Referred pain map
Iliopsoas — Referred pain mapOpen full-size image

Regional muscle reference; this is not an individual map of the selected numbered trigger point.

Pain referral. Lower back, groin, front of thigh

Pain Pattern

  • Anterior hip
  • Groin
  • Proximal anterior thigh
  • Low back

What This Pain Feels Like

Stairs, getting into a car or resisted hip flexion may reproduce the familiar complaint; several hip flexors and joint structures share these tasks. A long stride or an extension position may provoke symptoms, but restricted movement can also reflect pelvic position or hip-joint limitation.

What Patients Report

  • Pain when standing from sitting
  • Groin pain
  • Lower back ache
  • Hip stiffness
  • Pain with walking

What Makes It Worse

  • Standing from sitting
  • Walking uphill
  • Running
  • Leg raises
  • Prolonged sitting
  • Hip extension
Browse related exercises (5)

Symptoms patients report

Anterior hip or groin pain with lifting the knee Stairs, getting into a car or resisted hip flexion may reproduce the familiar complaint; several hip flexors and joint structures share these tasks.

Discomfort as the hip extends A long stride or an extension position may provoke symptoms, but restricted movement can also reflect pelvic position or hip-joint limitation.

Activity-related stiffness Track the dose of running, kicking or repeated leg raising that changes symptoms, rather than attributing stiffness to sitting alone.

Snapping at the front of the hip A painless snap can occur without injury. Painful snapping, catching or loss of function warrants a hip assessment.

Contributors to assess

A recent rise in hip-flexion demand Sprinting, hills, kicking or repeated leg raises may exceed current capacity.

Return after reduced activity Rebuild task exposure gradually rather than assuming a permanently shortened muscle.

Hip or lumbar symptoms affecting movement Guarding may accompany another condition; assess the region before selecting stretching or strengthening.

Previous hip surgery A painful hip-flexion task after surgery may need the treating team to assess tendon or implant-related issues and relevant restrictions.

For clinicians and supervised training

Clinical reference

Interpret anterior-hip pain with hip motion and loading; abdominal or neurological symptoms need separate assessment.

Anatomy and palpation

Anatomical relationships

Psoas major arises from the lower thoracic/lumbar vertebral region; iliacus occupies the iliac fossa. They pass beneath the inguinal ligament and attach around the lesser trochanter through the iliopsoas tendon complex. Their principal shared action is hip flexion.[1]

  • The iliac crest and anterior superior iliac spine orient the pelvis, but are not direct guides to safe deep psoas pressure.
  • The inguinal ligament spans toward the pubic region; the distal tendon is deep at the front of the hip.
  • The lesser trochanter is a deep femoral attachment, not a surface self-massage target.

Nearby structures. The lumbar plexus is closely related to psoas; the femoral nerve passes between psoas and iliacus. Major vessels, abdominal contents, the hip capsule and iliopsoas bursa make indiscriminate deep pressure inappropriate.

Palpation

Patient position. Clinician examination with consent and appropriate draping, supine with hips and knees supported in modest flexion to reduce guarding.

Find the landmarks

  • Identify the anterior superior iliac spine, inguinal region and safe superficial boundaries before contact.
  • The deep psoas belly and lesser-trochanter attachment are not directly accessible for routine surface confirmation.

Examination sequence

  1. Start with the patient indicating the familiar pain location and with light superficial regional contact.
  2. A trained clinician may assess local tenderness near the anterior hip while correlating it with gentle active or resisted hip flexion, staying clear of pulsatile or nerve-sensitive structures.
  3. If deep tissue identification would change care, consider an appropriate imaging-assisted specialist assessment instead of increasing manual pressure.

Document the findings

  • Local tenderness plus familiar pain on resisted flexion or hip-flexor stretch can support the clinical category of iliopsoas-related groin pain.
  • Tenderness alone does not distinguish muscle, tendon, bursa, hip joint or visceral disease.

Limits and precautions

  • No deep abdominal self-release, probing for a psoas knot or blind deep needling instructions.
  • Do not compress a palpable pulse or continue if contact produces tingling, marked guarding or abdominal pain.
  • Defer local pressure for unexplained abdominal symptoms, a groin mass, suspected bleeding or acute postoperative concerns.
[1][3]

Examination and tests

2

Modified Thomas test with pelvic control[2][3]

Measure hip-extension availability while separating it from a change in pelvic tilt.

Position
Supine near the end of a firm examination table with the pelvis securely supported. Hold the opposite thigh toward the trunk while the clinician supports the tested thigh as it lowers.
Technique
Establish and monitor pelvic orientation using the anterior pelvic landmarks and lumbar position. Lower the tested thigh only while that orientation remains stable; avoid substituting lumbar extension or forcing posterior pelvic tilt. Record the femoral angle relative to the controlled pelvis and the symptom response. Document knee position and repeat the same setup on reassessment.
Positive finding
Limited measured hip extension or reproduction of familiar groin pain is a finding; the thigh position relative to the table alone is not sufficient.
Interpretation
The result can guide whether a comfortable mobility trial is relevant. A painful test should be interpreted with resisted flexion and a hip-joint examination.
Limitations
The verification study involved healthy young adults and examined measurement validity. Pelvic control improves interpretation but does not isolate psoas, identify a trigger point or establish the cause of a symptomatic hip.

Resisted hip flexion with familiar-pain recording[3][1]

Assess hip-flexor loading tolerance and whether it reproduces the presenting groin complaint.

Position
Seated with trunk supported, hips and knees comfortably flexed; use the same position on both sides.
Technique
Ask the patient to lift the thigh slightly while the clinician applies gradually increasing downward resistance just proximal to the knee. Keep the pelvis still without forceful bracing. Record pain location, whether it is familiar, and force if a dynamometer is available; begin with low effort.
Positive finding
Familiar anterior hip/groin pain or a reproducible strength limitation, rather than any exertion sensation.
Interpretation
Together with local tenderness and the rest of the hip examination, familiar pain can support an iliopsoas-related groin-pain classification.
Limitations
Other hip flexors contribute and hip-joint disorders may also hurt with resisted flexion. The position is a practical clinical option, not a validated muscle-isolation protocol. Do not force maximal testing when stress injury or acute significant injury is suspected.

Distinguishing other causes

Hip-joint pain or femoral stress injury[3]

Findings that matter. Painful restricted hip motion, deep weight-bearing pain, catching, a limp or escalating pain with running can be more important than local tenderness.

Next step. Perform a hip examination. Suspected stress injury or inability to bear weight requires prompt medical assessment and avoidance of impact loading pending review.

Other groin-pain entities or hernia[3]

Findings that matter. Adductor loading, inguinal symptoms with straining, pubic pain or a groin lump may point elsewhere; overlapping entities are common.

Next step. Use regional examination to identify the pattern; a painful or irreducible lump with systemic/abdominal symptoms needs urgent assessment.

Iliopsoas tendon, bursal or postoperative problem[1]

Findings that matter. Painful snapping, pain after hip arthroplasty or a persistent flexion-provoked complaint may involve tendon, bursa or implant interaction.

Next step. Consider specialist examination and targeted imaging if it changes management; do not assume a manual release is required.

Neurological, abdominal or retroperitoneal disease[1]

Findings that matter. Fever, abdominal symptoms, anticoagulant use with acute pain, or new femoral-distribution weakness/numbness changes the assessment.

Next step. Seek medical assessment with urgency matched to severity; suspected infection or bleeding should not be managed with deep pressure or exercise.

Treatment selection and progression

Self-care and activity

Adjust the aggravating hip-flexion task[3]

Consider when. An assessed load-related anterior hip complaint without an acute injury requiring protection.

Identify the specific exposure: hills, sprinting, high kicks or repeated leg raises. Reduce its volume or range and retain a comfortable alternative such as level walking.

Dose and review
Clinician-adjusted example: replace the provoking session with a 10-minute comfortable level walk, shortening it further if symptoms rise. This is an individualized activity trial, not an iliopsoas-specific evidence-based dose.
Progression
Restore one component at a time after daily tasks and the next-day response remain manageable. Reintroduce speed and high-range kicking after easier tasks.
Stop or reassess
Stop and reassess for limping, deep weight-bearing pain, increasing night pain, fever or neurological symptoms.
Evidence and limits
Selection follows groin-pain classification and load tolerance. Direct evidence for this exact iliopsoas regimen is limited; diagnosis must guide progression.

Exercise and rehabilitation

Graded hip-flexor resistance[3][1]

Consider when. Reduced hip-flexion tolerance after a clinician has considered hip-joint and stress-injury causes.

Begin seated with the thigh supported. Apply light hand resistance while lifting the knee a small amount without leaning back. Progress to a light resistance band or standing march with support when comfortable.

Dose and review
Clinician-adjusted example: 4 comfortable 10-second isometric holds, or 2 sets of 8 slow repetitions, on alternate days. Choose one starting option. These are general loading examples, not trial-validated iliopsoas doses.
Progression
Increase resistance or the range of hip flexion, then add the task-specific demands of stairs, running or kicking. Use next-day walking and stairs as feedback.
Stop or reassess
Stop for sharp groin pain, catching, new numbness, a limp or a sustained decline in everyday function.
Evidence and limits
The examination identifies a load-sensitive clinical entity; it does not prove a particular exercise treats a trigger point. This loading approach is a rehabilitation extrapolation with limited direct iliopsoas trial evidence.

Exercise and rehabilitation

Comfortable hip-extension mobility when indicated[2][3]

Consider when. A reproducible extension limitation that improves with gentle movement and does not provoke joint pinching or acute tendon pain.

Use a supported split stance or padded half-kneeling position. Keep the pelvis facing forward and move it a small distance forward without arching the low back. Seek a mild anterior hip stretch, not deep groin pain.

Dose and review
Clinician-adjusted example: 2 gentle holds of 15–20 seconds once daily, followed by retesting the relevant movement. This is a mobility trial, not a validated correction for psoas shortening.
Progression
Increase range only if the original task improves and symptoms remain settled. Omit stretching when resistance work or activity modification is more useful.
Stop or reassess
Stop for pinching, catching, abdominal pain, radiating symptoms or pain that persists after the stretch.
Evidence and limits
Pelvic control matters for interpreting hip-extension measurement. The Thomas-test study does not establish treatment efficacy or validate this stretch dose.

Reassessment and follow-up

  • Repeat the same resisted-flexion position, recording familiar pain and force when measured.
  • Remeasure hip extension with the same controlled pelvic and knee position.
  • Track stairs, car entry or another chosen hip-flexion task and its next-day response.
  • Review walking/running exposure and whether snapping is painful or affects function.

Evidence and sources

  1. Anatomy, Bony Pelvis and Lower Limb: Iliopsoas Muscle

    2026 · Anatomy reference

    Updated June 2026; supports deep anatomy and proximity to neurovascular and abdominal structures, not claims of stress storage or guaranteed manual release.

  2. The modified Thomas test is not a valid measure of hip extension unless pelvic tilt is controlled

    2016 · Primary measurement study

    Twenty-nine healthy college students; addresses hip-extension measurement and pelvic tilt, not diagnosis of iliopsoas trigger points or symptomatic tendon disease.

  3. Doha agreement meeting on terminology and definitions in groin pain in athletes

    2015 · Expert consensus

    Clinical classification in athletes: iliopsoas tenderness, especially with familiar pain on resisted flexion or stretch. Multiple entities can coexist; this is not a tissue-specific gold standard.

Associated Trigger Points