Psoriatic arthropathy of the hand and wrist

What is psoriatic arthropathy of the hand?

Psoriatic arthropathy is an inflammatory disease of the joints and tendons that occurs in a proportion of people with psoriasis. It can affect individual finger or wrist areas or multiple structures at the same time. Synovitic (lining of the joint), enthesitic (tendon insertion) and tendosynovitic (tendon sheath) inflammation are typical. Unlike classic “wear and tear” arthritis, PsA is immune-mediated and often progresses in episodes.

• Common patterns: end joints (DIP), middle joints (PIP), basal joints (MCP) of the fingers, saddle joint of the thumb and wrist
• Dactylitis (“sausage finger”): simultaneous inflammation of the joints and tendon sheaths of a finger
• Nail changes (spotted nails, onycholysis) are often associated

Anatomy and mechanisms

The hand contains 27 bones and numerous small joints that are stabilized by tight ligaments, tendons and tendon sheaths. In PsA, inflammation not only affects the lining of the joints, but often the entheses - transitions from tendons and ligaments to the bones. These regions are particularly stressed mechanically and can develop inflammation if there is an existing immunological tendency.

• Synovium: becomes inflamed and thickened, producing inflammatory fluid
• Entheses: painful, tender to pressure; often at the base of the extensor tendons of the fingers
• Tendon sheaths: thickening, rubbing noises, “jumping” of the tendon possible

Typical symptoms and warning signs

• Pain and swelling in the fingers or wrists, often asymmetrical
• Morning stiffness >30 minutes, improvement with movement
• Dactylitis: entire finger diffusely swollen and tender
• Nail changes in psoriasis (dimples, peeling, discoloration)
• Tendonitis: pain when flexing/extending, possibly “snapping”
• Loss of strength, difficulty with fine motor activities (buttons, writing)
• During an attack: feeling of warmth, redness, exercise intolerance

Warning signs that should be clarified: rapidly increasing swelling, pain at night when resting, fever, new nerve disorders (numbness, loss of strength) or severe restrictions on movement.

Causes and risk factors

The exact cause is multifactorial. A genetic predisposition, immunological dysfunction and environmental factors work together. Mechanical stimuli to entheses can promote attacks.

• Genetic predisposition to psoriasis/PsA
• Trigger: mechanical overload, skin lesions (Koebner phenomenon), infections
• Lifestyle factors: Obesity, smoking and stress can influence inflammation

Diagnostics: step by step

An early, structured clarification helps to prevent damage. In our practice at Dorotheenstrasse 48, 22301 Hamburg, we record complaints, functional status and clinical findings specifically on the hand and wrist.

Hand and wrist imaging

• Ultrasound (if necessary with power Doppler): detection of synovitis, tenosynovitis and active enthesitis; helpful for guiding injections
• X-ray: shows erosions, bony attachments, possibly misalignments; also serves to differentiate from osteoarthritis
• MRI: early visualization of inflammation and bone marrow edema; useful for unclear courses or wrist involvement

Imaging is used according to the indication – not every patient needs all procedures.

Laboratory and differential diagnoses

There is no single laboratory test that proves PsA. Blood tests are used to monitor inflammation and rule out other rheumatic diseases.

• CRP/ESR: may be elevated but is not specific
• Rheumatoid factor/anti-CCP: mostly negative (helps differentiate from rheumatoid arthritis)
• Gout parameters (uric acid) in differential diagnosis
• Rule out signs of infection, especially in highly acute cases

A distinction must be made, among other things: rheumatoid arthritis, finger osteoarthritis (DIP/PIP), gout, infections and mechanical overuse syndromes.

Conservative treatment: Hand-focused and gradual

The therapy depends on activity, distribution and everyday impairment. Conservatively, the focus is on the combination of inflammation control, functional promotion and joint protection. Basic systemic therapies are usually the responsibility of rheumatology - we coordinate closely and take care of the hand orthopedic components.

• Education & self-management: Recognize relapse patterns, avoid triggers, treat skin/nails
• Physio and occupational therapy: mobility, tendon gliding, grip strength; Joint-friendly techniques, advice on aids
• Splints/orthotics: individually dosed immobilization for acute attacks (e.g. thumb/wrist orthoses); Balancing protection and movement
• Non-steroidal anti-inflammatory drugs (NSAIDs): temporary for pain relief - benefits/risks individual
• Cryo/Thermotherapy: Cooling in acute inflammation, heat in chronic phases can be perceived as pleasant
• Workplace and everyday life adjustments: thickened handles, gentle tools, break management

Local therapy: Injections to joints and tendon sheaths

If the inflammation is clearly limited, targeted, ultrasound-assisted injections can temporarily alleviate the symptoms. The decision is made carefully and in the overall context of systemic therapy.

• Cortisone injections: into joints, tendon sheaths or entheses - cautiously and with information about risks (including skin atrophy, tendon irritation, risk of infection)
• Hyaluronic acid: less established for inflammatory rheumatic arthritis of the hand; Use only in selected situations
• Autologous conditioned plasma/PRP: there is currently no confirmed disease-modifying evidence for PsA; Use, if at all, only very selectively and after informed consent

Systemic therapies: Rheumatological coordination

When PsA is active, local measures alone are often not enough. Basic rheumatological therapy aims to control inflammation and prevent damage. If necessary, we establish a connection to rheumatology/dermatology and support the hand orthopedic aspects.

• Conventional DMARDs (e.g. methotrexate, leflunomide, sulfasalazine)
• Biologics (e.g. TNF-, IL-17-, IL-23-targeted therapies) or targeted synthetic DMARDs according to rheumatological indication
• Regular monitoring of effects and side effects by the prescribing specialist discipline

When does an operation make sense?

Surgical measures are the exception and are considered if relevant functional deficits, tendon problems or structural damage persist despite optimal conservative and systemic therapy. Each indication is individual and evidence-based.

• Tenosynovectomy: Removal of inflammatory tendon sheaths to improve tendon glide
• Synovectomy (open/arthroscopic): for therapy-resistant synovitis, e.g. B. on the wrist
• Tendon reconstruction/suture: in case of impending or actual rupture
• Joint stiffening (arthrodesis) of individual end or middle joints: to reduce pain and provide stability in cases of severe destruction
• Joint replacement procedures on the hand area: only very selective; Carefully weigh the benefit and risk

Post-operatively, targeted hand therapy and splint concepts are important in order to regain function and suitability for everyday use.

Living with Psoriatic Arthropathy: Practical Tips

• Exercise regularly, but in a way that is gentle on the joints: e.g. E.g. swimming, cycling, tendon gliding exercises
• Weight management and quitting smoking support inflammation regulation
• Skin and nail care consistently; Reduce irritation and microtrauma
• Use ergonomic aids at home and at work
• Document flare-ups (diary/apps) and recognize patterns
• Adequate sleep and stress reduction (e.g. relaxation procedures)

Course and prognosis

The course is individual: from mild, rare attacks to persistent activity. Early, goal-oriented therapy can reduce pain and loss of function and lower the risk of structural damage. There are no guarantees - regular checks and good coordination between orthopedics, rheumatology and dermatology are crucial.

When should I seek medical advice?

• New or increasing swelling, pain at rest, or morning stiffness of the hand
• “Sausage fingers” or significant nail changes in the presence of psoriasis
• Pain with loss of strength, snapping phenomena, numbness or abnormal sensations
• Unclear signs of fever or infection in connection with joint problems

Your hand in good hands – Orthopedics Hamburg

In our orthopedic practice at Dorotheenstrasse 48, 22301 Hamburg, we offer hand-focused diagnostics (including high-resolution ultrasound), conservative therapies, splint care in cooperation and ultrasound-assisted infiltrations, if appropriate. If PsA is confirmed or suspected, we will accompany you closely and coordinate the treatment with rheumatology and dermatology - structured, understandable and on an equal footing.