Pes Anserine Bursitis
Lower LimbOverview
Pes anserine bursitis is inflammation of the bursa located between the pes anserinus tendons (sartorius, gracilis, semitendinosus) and the medial tibia, typically presenting with anteromedial knee pain. It is common in athletes, individuals with obesity, and those with biomechanical dysfunction such as knee valgus or excessive tibial internal rotation. The condition is usually self-limiting with appropriate conservative management including activity modification and addressing underlying causative factors.
Pathophysiology
The pes anserine bursa serves as a buffer between the three conjoined tendons and the underlying bone and medial collateral ligament. Repetitive friction from these tendons, particularly during activities involving knee flexion and hip internal rotation, leads to bursal inflammation and fluid accumulation. Contributing factors include tight hip internal rotators, weak hip abductors (gluteus medius insufficiency), excessive knee valgus, tibial internal rotation, increased body mass index, and activities involving running or climbing stairs. Chronic inflammation can develop from prolonged mechanical irritation without proper rehabilitation.
Typical Presentation
Site
Anteromedial knee, approximately 4-6 cm below the joint line, at the insertion point of the pes anserinus
Quality
Dull, aching pain; may describe as sharp with direct palpation or during provocative movements
Intensity
Mild to moderate (typically 3-6/10), often worsening with activity and improving with rest
Aggravating
Climbing stairs, running, long walks, knee flexion combined with hip internal rotation, sitting with knees crossed, direct pressure to the bursa
Relieving
Rest, ice application, anti-inflammatory medication, knee extension, hip external rotation stretching
Associated
Swelling over anteromedial knee, warmth in affected area, morning stiffness, pain with resisted hip adduction, possible knee effusion, tightness in hip internal rotators and adductors
Orthopaedic Tests
Pes Anserine Tenderness Test
Procedure
Patient is positioned supine or seated with knee flexed. Palpate directly over the pes anserine insertion on the anteromedial tibia, approximately 2–3 cm below the joint line. Apply gradual pressure and assess for point tenderness.
Positive Finding
Reproduction of local pain or tenderness at the pes anserine insertion site
Sensitivity / Specificity
Unknown / Unknown
Interpretation
Direct palpation tenderness is the primary clinical finding in pes anserine bursitis. While not highly specific, it is a core diagnostic feature. Must be differentiated from medial collateral ligament tenderness (which lies more superiorly) and from medial meniscus pathology.
Noble Compression Test (Modified for Pes Anserine)
Procedure
Patient lies supine. Examiner palpates the pes anserine region while passively flexing and extending the knee, or while applying gentle valgus stress. Pain reproduction with knee movement or stress is assessed.
Positive Finding
Pain with palpation during knee flexion/extension or with mild valgus stress applied to the anteromedial knee
Sensitivity / Specificity
Unknown / Unknown
Interpretation
Reproduction of pain with dynamic movement helps confirm that symptoms originate from the pes anserine rather than static structural pathology. Helps rule out intra-articular pathology.
Resisted Hip Adduction Test
Procedure
Patient is side-lying on the uninvolved side with hip abducted. Examiner provides manual resistance as patient adducts the hip. Alternatively, patient may sit with examiner resisting medial knee-to-midline movement.
Positive Finding
Pain or weakness with resisted hip adduction, particularly in the anteromedial knee region
Sensitivity / Specificity
Unknown / Unknown
Interpretation
Tests the gracilis component of the pes anserine (sartorius, gracilis, semitendinosus). Pain with this test suggests pes anserine involvement given the anatomical attachments and mechanism of overuse injury.
Resisted Knee Flexion Test
Procedure
Patient is seated or prone with knee flexed to 90 degrees. Examiner provides manual resistance as patient attempts to flex the knee further or resists examiner's attempt to extend the knee.
Positive Finding
Pain in the anteromedial tibia region or reproduction of pes anserine tenderness with resisted knee flexion
Sensitivity / Specificity
Unknown / Unknown
Interpretation
Tests the semitendinosus component of the pes anserine. Pain in the pes anserine region (not in the hamstring belly) suggests local bursal or tendon involvement. Helps differentiate from isolated hamstring strain.
Thessaly Test (Modified interpretation for Pes Anserine)
Procedure
Patient stands on one leg with knee slightly flexed (20 degrees) and internally/externally rotates the tibia while the knee flexes and extends slightly. Examiner supports patient for safety and assesses for pain location and character.
Positive Finding
Anteromedial knee pain (rather than joint line pain), localised to the pes anserine region during rotation and dynamic movement
Sensitivity / Specificity
Unknown / Unknown
Interpretation
While primarily a meniscal test, the Thessaly test can provoke pes anserine pain if present. Pain localised anteromediallly away from the joint line suggests pes anserine involvement; joint line pain suggests meniscal pathology.
Ultrasonographic Imaging / Palpation Correlation
Procedure
High-frequency ultrasound (7–12 MHz) imaging of the pes anserine region in transverse and longitudinal planes. Correlate imaging findings with clinical palpation tenderness (sonoelastography or grey-scale thickening of bursa and tendon sheaths).
Positive Finding
Bursal distension (>5 mm thickness), hypoechoic bursal fluid, tendon thickening, or peribursal oedema confirmed on ultrasound and correlated with point of maximal tenderness
Sensitivity / Specificity
88–92% (for bursal distension and inflammation) / See current literature
Interpretation
Ultrasound is the most sensitive imaging modality for detecting bursal inflammation and fluid accumulation. Correlation with palpation-guided imaging improves diagnostic confidence. Helps exclude other medial knee pathology (MCL injury, medial meniscal tear).
⚠ Red Flags
- •Sudden onset following direct trauma with significant swelling and ecchymosis
- •Signs of systemic infection: fever, chills, spreading erythema, regional lymphadenopathy
- •Severe unrelenting pain unresponsive to conservative treatment suggesting alternative diagnosis
- •Locking or catching sensations indicating possible meniscal pathology
- •Significant knee instability or giving way suggesting ligamentous injury
- •Night pain disrupting sleep or pain at rest suggesting inflammatory arthropathy
⚡ Yellow Flags
- •High pain catastrophizing beliefs regarding the injury
- •Fear-avoidance behaviors limiting activity beyond clinical necessity
- •Anxiety about returning to sport or work activities
- •Psychosocial stressors affecting rehabilitation compliance
- •Perceived lack of control over symptoms
- •Previous chronic pain conditions or somatization patterns
- •Poor sleep quality exacerbating inflammation and recovery
Osteopathic Techniques
Region
Hip and pelvis
Technique
MET
Rationale
Muscle energy techniques targeting tight hip adductors, gracilis, and sartorius reduce tension on the pes anserinus tendons and decrease friction on the bursa. Evidence supports MET for improving hip mobility and reducing knee anteromedial pain in athletes.
Region
Hip and pelvis
Technique
Soft Tissue
Rationale
Soft tissue mobilization of hip internal rotators, adductors, and tensor fasciae latae reduces compensatory tension patterns that drive knee valgus and tibial internal rotation. Direct technique reduces muscular guarding and restores normal biomechanics.
Region
Anteromedial knee
Technique
Soft Tissue
Rationale
Gentle soft tissue work around the pes anserinus insertion promotes local circulation, reduces fluid stagnation in the bursa, and decreases pain perception. Avoid direct aggressive pressure over the acutely inflamed bursa.
Region
Tibiofibular and knee joints
Technique
Articulation
Rationale
Gentle knee articulation in pain-free ranges restores synovial fluid distribution, maintains arthrokinematics, and prevents stiffness. Avoids aggravation while maintaining function during acute inflammation.
Region
Hip and knee
Technique
Functional
Rationale
Functional technique addressing the relationship between hip internal/external rotation and knee valgus helps normalize aberrant movement patterns that perpetuate bursal irritation and supports proprioceptive re-education.
Region
Lumbopelvic region
Technique
MET
Rationale
Addressing lumbar and pelvic dysfunction optimizes hip mechanics and reduces compensatory knee valgus. Pelvic stability is prerequisite for normal hip and knee biomechanics in functional activities.
Add-On Approaches
Chinese Medicine
Acupuncture to local points (Ex-LE4, GB34) and distant points (ST36, SP9) to reduce inflammation, promote Qi circulation, and address Liver and Spleen deficiencies contributing to muscular laxity and inflammation
Chiropractic
Knee and hip joint mobilization combined with correction of knee valgus alignment and tibial rotation; proprioceptive neuromuscular facilitation (PNF) patterns to enhance hip abductor control
Physiotherapy
Progressive strengthening of hip abductors (gluteus medius and maximus) through resistance band work and single-leg stance exercises; neuromuscular retraining emphasizing hip control during running and stair climbing
Remedial Massage
Deep tissue massage to hip adductors, gracilis, and sartorius; fascial release techniques to reduce tension in tissues contributing to mechanical irritation of the bursa
Rehabilitation Exercises
Hip Adductor (Gracilis/Adductor Longus) Stretch
Sartorius Stretch (Supine Figure-4 with Flexion)
Hip Internal Rotator Stretch (Figure-4 Piriformis)
Hip Abduction with Resistance Band (Standing)
Gluteus Medius Activation (Clamshells)
Single-Leg Stance with Hip Control
Step-Up with Emphasis on Hip Abductor Control
Single-Leg Balance with Dynamic Arm Reach
Hip Internal and External Rotation (Supine)
Hip Abductor Activation During Gait (Walking with Resistance Band)
Side-Lying Hip Abduction with Knee Extended
Stationary Cycling with Proper Knee Alignment
Referral Criteria
- •Failure to improve after 4-6 weeks of conservative treatment with appropriate activity modification and rehabilitation
- •Clinical signs suggestive of meniscal pathology (locking, catching, positive McMurray test)
- •Evidence of knee ligamentous instability requiring structural imaging or specialist assessment
- •Suspected septic bursitis evidenced by fever, significant local warmth, erythema, and severe pain
- •Persistent swelling and symptoms requiring imaging confirmation or ultrasound-guided aspiration
- •Signs of underlying inflammatory arthropathy (bilateral symptoms, morning stiffness >1 hour, elevated inflammatory markers)
- •Recurrent bursitis suggesting anatomical abnormality or need for advanced imaging (MRI) and specialist management
- •Symptoms suggestive of referred pain from hip (osteoarthritis) or lumbar spine requiring alternative management approach