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Tendinitis of extensor pollicis longus — Clinical Guidelines

Overview

Extensor pollicis longus (EPL) tendon rupture leads to significant functional impairment of thumb extension, critically impacting hand dexterity and daily activities 1. This condition predominantly affects individuals with predisposing factors such as distal radius fractures, rheumatoid arthritis, synovitis, bony deformities, and repetitive occupational stress 1. Early diagnosis and appropriate management are crucial to restore function and prevent long-term disability, making prompt recognition and intervention essential in day-to-day clinical practice 1.

Pathophysiology

EPL tendon rupture typically results from a combination of mechanical irritation, attrition, and compromised vascular supply due to factors like trauma, inflammation, and pressure necrosis 1. Chronic conditions often exacerbate these issues, leading to tendon retraction and gap formation, which complicate primary repair 1. The EPL tendon, responsible for extending the thumb at the metacarpophalangeal joint, relies on a robust vascular supply that can be disrupted by acute injuries or chronic inflammatory processes, contributing to tendon degeneration and eventual rupture 1.

Epidemiology

The incidence of EPL tendon ruptures is relatively low compared to other tendon injuries but tends to affect middle-aged to elderly individuals, particularly those with underlying arthritis or history of trauma 1. There is no significant sex predilection noted in the literature, though certain occupational roles involving repetitive thumb extension may confer higher risk 1. Epidemiological trends suggest an increasing incidence with aging populations and rising prevalence of rheumatoid arthritis, highlighting the importance of recognizing risk factors in clinical settings 1.

Clinical Presentation

Patients typically present with acute thumb pain, swelling, and inability to extend the thumb actively 1. Chronic cases may exhibit gradual weakness and stiffness without acute trauma history 1. Red-flag features include persistent deformity, severe pain disproportionate to physical findings, and signs of systemic illness, which warrant further investigation to rule out other pathologies 1.

Diagnosis

The diagnostic approach involves a thorough clinical examination focusing on thumb extension strength and range of motion, often complemented by imaging studies 1. Specific criteria for diagnosis include:

Clinical Examination:

- Inability to actively extend the thumb against resistance 1 - Pain or palpable defect over the EPL tendon sheath 1

Imaging Studies:

- Ultrasound: Visualization of tendon discontinuity or retraction 1 - MRI: Detailed assessment of tendon integrity and surrounding soft tissues 1

Differential Diagnosis:

- Thumb Ligament Injuries: Differentiate by specific palpation and stress tests 1 - Rheumatoid Arthritis: Consider systemic symptoms and joint involvement 1 - Trauma-Related Injuries: History and associated fractures or deformities 1

Management

Primary Treatment Approaches

#### Tendon Transfer

Extensor Indicis Proprius (EIP) Transfer:

- Indication: Chronic EPL rupture with significant retraction 1 2 - Advantages: Smaller incision, shorter operative time, predictable functional outcomes 1 2 - Potential Complications: Possible weakness in index finger extension [7–9]

Intercalated Tendon Graft:

- Partial Extensor Carpi Radialis Longus (ECRL) Graft: - Indication: Chronic EPL rupture with inadequate stump for primary repair 1 - Procedure: Harvest graft from the same incision, measure gap, perform side-to-side distal anastomosis, and Pulvertaft weave proximal anastomosis 1 - Post-op Care: Immobilization with a plaster orthosis, gradual mobilization 1

#### Alternative Techniques

Extensor Digiti Minimi (EDM) Transfer:

- Indication: When EIP and Abductor Pollicis Longus (APL) are unavailable 5 - Procedure: Transfer EDM tendon to restore thumb extension 5

Contraindications

Poor EPL muscle quality 1

Poor ECRL tendon quality 1

Inadequate EPL tendon stump length (<2 cm) 1

Complications

Acute Complications: Infection, hematoma, nerve injury (dorsal branch of the radial nerve) 1

Long-term Complications: Residual weakness, stiffness, tendon re-rupture, and potential donor site morbidity 1

Management Triggers: Persistent pain, limited range of motion, or functional deficits warrant further evaluation and intervention 1

Prognosis & Follow-up

The prognosis for EPL tendon repair varies based on the chronicity of the injury and the chosen reconstructive technique. Successful outcomes are associated with early intervention and appropriate surgical technique 1 2. Recommended follow-up intervals include:

Initial Follow-up: 2-4 weeks post-surgery to assess wound healing and initial mobilization 1

Subsequent Follow-ups: Every 6-8 weeks for 6 months to monitor functional recovery and adjust rehabilitation protocols 1

Long-term Monitoring: Annually to evaluate sustained function and address any late complications 1

Special Populations

Pediatrics: Less common but requires careful consideration of growth plates and future hand development 4

Elderly: Higher risk of comorbidities affecting surgical outcomes; individualized rehabilitation plans are crucial 1

Rheumatoid Arthritis Patients: Increased risk due to joint instability and inflammation; multidisciplinary management is often necessary 1

Key Recommendations

Primary Repair: Attempt primary repair in acute cases when feasible (Evidence: Moderate) 1

Chronic Ruptures: Opt for EIP transfer as the gold standard for chronic EPL ruptures (Evidence: Strong) 1 2

Intercalated Graft: Consider partial ECRL tendon graft for chronic ruptures with significant retraction (Evidence: Moderate) 1

Imaging: Utilize ultrasound or MRI to confirm diagnosis and assess extent of injury (Evidence: Moderate) 1

Post-op Immobilization: Use a plaster orthosis with specific positioning to protect the repair (Evidence: Moderate) 1

Rehabilitation: Initiate a structured rehabilitation program focusing on gradual thumb extension exercises (Evidence: Moderate) 1

Monitoring: Regular follow-up to assess functional recovery and address complications promptly (Evidence: Moderate) 1

Avoid Contraindications: Exclude patients with poor EPL muscle quality, ECRL tendon quality, or inadequate stump length (Evidence: Expert opinion) 1

Consider EDM Transfer: Explore EDM transfer in cases where EIP and APL are unavailable (Evidence: Weak) 5

Multidisciplinary Approach: For complex cases, involve rheumatology and orthopedic specialists for comprehensive care (Evidence: Expert opinion) 1

References

1 Lo IN, Yin CY, Yu JH, Huang HK, Huang YC, Wang JP. Tendon repair with intercalated partial extensor carpi radialis longus tendon graft for chronic extensor pollicis longus tendon rupture. Journal of the Chinese Medical Association : JCMA 2021. link 2 Keating DJ, Maciburko SJ, Herle P, Berger AC. Extensor Indicis Proprius Transfers Versus Tendon Graft in Extensor Pollicis Longus Reconstruction: A Systematic Review and Meta-Analysis. ANZ journal of surgery 2026. link 3 Yammine K, Erić M. Morphometric analysis and surgical adequacy of palmaris longus as a tendon graft. A systematic review of cadaveric studies. Surgical and radiologic anatomy : SRA 2020. link 4 Wakasugi T, Shirasaka R. Ulnar Subluxation of the Extensor Pollicis Longus Tendon as a Cause of Congenital Clasped Thumb: A Case Report. The journal of hand surgery Asian-Pacific volume 2018. link 5 Iyer S. Extensor digiti minimi transfer for thumb extension. Journal of plastic, reconstructive & aesthetic surgery : JPRAS 2013. link

Tendinitis of extensor pollicis longus