Typical Symptoms of Iliopsoas Tendonitis
Iliopsoas tendonitis characteristically presents with insidious onset of load-related anterior groin pain that worsens with hip flexion activities, often described as sharp or stabbing in quality. 1
Primary Clinical Presentation
The hallmark symptom pattern follows a predictable progression:
- Pain characteristics: Sharp or stabbing anterior groin pain that is well-localized and activity-related 1
- Temporal pattern: In early stages, pain occurs during activity but may subside after a warm-up period; as the condition progresses, pain increases in both intensity and duration, eventually occurring at rest 1
- Onset: Typically insidious, coinciding with increased activity or initiation of new activities (though not all patients report this trigger) 1
Specific Provocative Activities
Pain is characteristically triggered by:
- Hip flexion movements: Active hip flexion consistently reproduces symptoms 2, 3
- Stair navigation: Ascending or descending stairs exacerbates pain 1
- Prolonged sitting: Extended sitting positions worsen discomfort 1
- Straight leg raising: Active raising of the straightened leg against resistance provokes pain 4
Physical Examination Findings
The diagnosis is supported by well-localized tenderness on palpation that reproduces the patient's activity-related pain, combined with positive provocative maneuvers that simulate tendon loading. 1
Key examination findings include:
- Palpable findings: Tenderness over the iliopsoas tendon, occasionally with palpable mass or infiltrate in the iliac-psoas muscle area 2, 5
- Positive psoas sign: Characteristic finding in acute cases 2
- Pain with resisted hip flexion: Particularly when tested in seated position 6
- Pain with passive hyperextension: Stretching the iliopsoas reproduces symptoms 4
- Limited range of motion: Reduced on the symptomatic side compared to contralateral hip 1
Associated Findings in Chronic Cases
In longstanding tendinopathy:
- Muscle atrophy: Often present and serves as an important clue to chronicity 1
- Visible swelling or asymmetry: Commonly noted when examining affected tendons 1
- Lameness: May develop with persistent symptoms 2
Post-Surgical Context (After Total Hip Arthroplasty)
When iliopsoas tendonitis occurs after THA (2-6% incidence), symptoms include:
- Persistent postoperative groin pain: Specifically triggered by hip flexion 3, 7
- Delayed onset: Can occur years after initially successful surgery 5
- Associated symptoms: Patients are 5 times more likely to report concurrent low back pain and greater trochanter pain 3
Important Clinical Pearls
The HEC (hip-external rotation-flexion-ceiling) test demonstrates 94% sensitivity and 88% specificity for diagnosing iliopsoas tendinopathy, outperforming conventional examination maneuvers. 6 This test combines the primary function (hip flexion) with the secondary function (external rotation) of the iliopsoas muscle.
Common pitfall: Joint effusions are uncommon with isolated tendinopathy; their presence should prompt evaluation for intra-articular pathology rather than pure tendon disease 1. Additionally, multiple symptomatic tendons should raise suspicion for underlying rheumatic disease requiring rheumatologic evaluation 1.
The diagnosis can be confirmed with fluoroscopy-guided iliopsoas tendon sheath injection showing significant pain reduction (typically ≥4 points on VAS), which serves as the diagnostic gold standard 3, 6.