Anterior hip and groin pain is often labeled “hip flexor tightness,” but the iliopsoas is only one possible source. Symptoms can come from the iliopsoas tendon or bursa, the hip joint, the adductors, the rectus femoris, pubic or inguinal structures, or other causes.
Iliopsoas-related groin pain is more likely when symptoms are reproduced by loading the iliopsoas—particularly resisted hip flexion—and when tenderness is localized to the iliopsoas region. Snapping adds another diagnostic question because the tendon can move abnormally over adjacent structures even when static imaging is unrevealing.
At Novo Soft Tissue in the Denver Tech Center, Dr. Scott King first determines whether the iliopsoas is actually the pain generator, then assesses hip-flexion capacity, snapping, hip-joint findings and whether dynamic ultrasound or MRI is needed before selecting progressive loading, manual treatment, shockwave therapy, imaging or referral.
Why “Tight Hip Flexors” Is Not a Diagnosis
Feeling tight at the front of the hip describes a sensation. It does not identify which structure is causing the symptoms. The same feeling can reflect iliopsoas tendinopathy, muscle overload, hip-joint pathology, protective muscle tone, anterior hip impingement, adductor or other groin pathology, neural symptoms or simply a habitual movement strategy. That is why the exam tests how each structure responds to load rather than starting with stretching.
Iliopsoas-Related Conditions
Iliopsoas Tendinopathy
Load-related pain from the iliopsoas tendon near the front of the hip. It is often aggravated by resisted hip flexion, running, hills, repeated hip flexion and kicking, and sometimes by deep hip flexion, depending on the presentation.
Iliopsoas Bursitis
Irritation of the bursa that lies between the tendon and the front of the hip joint. Symptoms overlap with tendon pain and often cannot be separated clinically. Bursitis can coexist with tendon pathology or hip-joint pathology.
Internal Snapping Hip
A mechanical snap caused by abrupt movement of the iliopsoas tendon during hip motion. It may be painful or painless, and a painless snap usually needs no treatment. See internal snapping hip.
Iliopsoas Pain After Hip Replacement
Painful iliopsoas impingement after total hip arthroplasty is a mechanically distinct problem and should not be managed as routine athletic iliopsoas tendinopathy. It is usually related to the position of the implant and is evaluated with the surgical team.
How Iliopsoas-Related Pain Is Identified
Under the Doha groin-pain framework, iliopsoas-related symptoms are supported by iliopsoas tenderness and become more likely when resisted hip flexion or hip-flexor stretching reproduces the pain. That is a clinical pattern, not proof of a specific tendon lesion.
The newest systematic review found that no single examination test is definitive for iliopsoas-related groin pain, but the HEC test and resisted seated hip flexion performed best among the available diagnostic maneuvers. Conservative treatment generally performed well in athletic and idiopathic cases, while outcomes were more variable after total hip arthroplasty. The diagnostic studies were few and at high risk of bias, so these accuracy estimates should be treated as preliminary rather than absolute.
A 2025 diagnostic study found the HEC test and resisted seated hip flexion more useful than several traditional hip-flexor tests. The Thomas test and a simple snapping-hip test performed poorly as stand-alone diagnostic tools. A 2026 injection-referenced clinical study found that weakness or pain during seated hip flexion and focal iliopsoas tenderness were more sensitive than MRI findings for identifying iliopsoas-related pain. MRI abnormalities were present in only a minority of symptomatic hips in that cohort. MRI remains useful for excluding or characterizing other hip pathology rather than serving as a stand-alone iliopsoas pain test.
Not All Front-of-Hip Pain Is the Iliopsoas
- Hip joint: femoroacetabular impingement, labral or cartilage problems and osteoarthritis where age-appropriate. Clues include deep groin pain, painful or restricted rotation, catching or locking. No single test such as FADIR proves FAI, and clicking does not prove a labral tear. The comparison is explained in iliopsoas pain vs. hip joint pain.
- Adductors: adductor tenderness with pain on resisted adduction. Adductor and iliopsoas pain can overlap anatomically, so the examination should load each tissue separately. See adductor tendinopathy and groin pain.
- Rectus femoris: crosses both the hip and knee. Consider it with more superficial front-of-thigh pain, a kicking or sprinting injury, or pain when hip flexion is combined with knee extension. See quadriceps and rectus femoris pain.
- Pubic and inguinal causes: tenderness over the pubic symphysis or pain in the inguinal canal points to different entities, covered on the groin pain page.
- Bone stress, nerve and other causes: femoral neck or pelvic stress injury, nerve symptoms, referral from the lumbar spine and abdominal, urologic or gynecologic conditions. Progressive weight-bearing pain, night pain, numbness or atypical symptoms need appropriate medical evaluation.
Lateral hip pain from the gluteal tendons is a separate problem, covered on the lateral hip pain page.
What We Examine
- Exact pain location and focal palpation of the iliopsoas region
- Resisted seated hip flexion, including strength compared with the other side
- The HEC test and other iliopsoas loading tests
- Hip range of motion and hip-joint provocation
- Adductor, rectus femoris, abdominal and inguinal testing
- Whether snapping occurs, which movement produces it and whether it reproduces the pain
- Running, hill, kicking or stair tolerance where relevant
- Prior hip surgery, including hip replacement
No single test is definitive. History, focused examination, the hip-joint differential and selective imaging matter more than one scan or one maneuver.
When Is Imaging Needed?
Dynamic ultrasound is particularly useful for internal snapping hip because it shows the tendon moving in real time during the motion that reproduces the snap. Static imaging can miss that movement.
Hip radiographs and MRI are often used when iliopsoas-related pain is suspected because hip-joint pathology frequently coexists. MRI can be valuable when hip-joint pathology, structural injury or another source of groin pain is suspected, but a normal or minimally abnormal MRI does not exclude clinically meaningful iliopsoas-related pain. Imaging is chosen to answer a specific question.
How Treatment Is Selected
Progressive Hip-Flexor Loading
Most idiopathic and athletic iliopsoas presentations improve with conservative care, although rehabilitation protocols vary and the evidence base remains heterogeneous. Loading is the foundation for uncomplicated load-related iliopsoas pain. A typical progression moves from low-load hip flexion to seated resisted hip flexion, standing hip flexion and long-lever hip-flexion loading, then running, hills, sprinting, kicking and sport-specific hip-flexion demand as appropriate. Dose is matched to the presentation rather than a fixed program.
Stretching may help selected patients, but if compression or tendon irritability is driving symptoms, aggressive stretching may reproduce pain and should not be prescribed automatically.
Manual Soft-Tissue Treatment
Manual treatment may be useful when surrounding soft-tissue restriction limits comfortable loading, but it should be paired with restoration of hip-flexor capacity. When the exam finds relevant restriction, Manual Adhesion Release may be part of that plan. Manual treatment does not change the path of a snapping tendon.
Shockwave Therapy
Focused or radial shockwave may be considered as an adjunct for persistent iliopsoas tendon pain once hip-joint pathology, snapping mechanics and other groin diagnoses have been considered. Direct iliopsoas-specific evidence is limited, and shockwave does not mechanically correct snapping. See the shockwave evidence review.
Dynamic Ultrasound
Especially useful for painful snapping and abnormal mechanical tendon motion.
MRI
Useful when hip-joint pathology, structural injury or broader groin pathology is suspected.
Referral
Referral is appropriate for significant hip-joint pathology, mechanical iliopsoas impingement after hip replacement, refractory disabling snapping, major structural injury, progressive weakness and other non-soft-tissue causes. Iliopsoas release should not be presented as a benign default solution. Contemporary comparative evidence has not shown clear added benefit in native hips beyond treating associated intra-articular pathology, and measurable hip-flexor atrophy and strength loss have been reported. Surgery still has a role in carefully selected cases.
You do not need to decide which treatment you need before your visit. All four tools are compared on the services page, and shockwave at Novo is explained on shockwave therapy in Denver.
What Research Says
- Classification: the Doha agreement places iliopsoas-related groin pain alongside adductor-, inguinal- and pubic-related pain, defined by iliopsoas tenderness and made more likely by painful resisted hip flexion or hip-flexor stretching (Weir, 2015).
- Clinical tests: in a 2025 study of 44 patients using injection response as the reference, the HEC test, resisted seated hip flexion and resisted seated hip external rotation were the only tests rated “good,” while the Thomas test, straight-leg raise in neutral and the snapping hip test were rated “poor” (Vandeputte, 2025).
- Systematic review: a 2026 review of 3 diagnostic and 71 treatment studies reported HEC test sensitivity of 94% and specificity of 88%, but all three diagnostic studies were at high risk of bias. Conservative care succeeded in 77–100% of idiopathic and athletic cases and 16–50% after hip replacement, across heterogeneous treatments (Vandeputte, 2026).
- Exam vs. MRI: in 135 injections in 105 patients, absolute seated hip-flexion weakness was 96.2% sensitive and focal tenderness 92.6% sensitive, while MRI was 19.2% sensitive and 85.0% specific (Johnstone, 2026).
- Snapping: dynamic ultrasound shows the snapping event in real time, and in one series only 14 of 26 snapping hips were painful (Pelsser, 2001).
- Treatment: conservative care is first-line for iliopsoas disorders, with surgery reserved for cases that fail it (Anderson, 2016).
This is why Novo treats anterior hip pain as a localization problem before it becomes a treatment problem.
Iliopsoas vs. hip joint pain → · Internal snapping hip → · Shockwave evidence review →
Sources: Weir et al., Br J Sports Med 2015 · Vandeputte et al., J Clin Med 2026 · Vandeputte et al., Clin Orthop Relat Res 2025 · Johnstone et al., Am J Sports Med 2026 · Pelsser et al., AJR 2001 · Piechota et al., J Ultrason 2016 · Anderson, Clin Sports Med 2016 · Maloy et al., Am Fam Physician 2025
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