Psoriatic arthritis of the hip

What is Psoriatic Arthritis of the Hip?

Psoriatic arthritis is a chronic inflammatory joint disease from the spondyloarthritis spectrum. In addition to peripheral joints (e.g. fingers, knees), the hip joint and sacroiliac joints can also be affected. Hip involvement is less common than the knee or hand, but can be significantly painful and limit mobility. The inflammation typically affects the joint lining (synovitis), tendon attachments (enthesitis) and - especially in the pelvis - the sacrum and iliac joints (sacroiliitis).

• Typical pain: groin, front thigh, buttocks
• Often morning stiffness > 30 minutes
• Alternation between flare-ups and calmer phases
• Possible concomitant: skin psoriasis, nail changes, dactylitis

Anatomy of the hip and pelvis - why pain occurs

The hip joint is a ball joint between the femoral head and the socket. It is surrounded by a joint capsule with mucous membrane (synovium), which can become thickened and painful in inflammatory diseases. Tendon attachments (e.g. on the greater trochanter) are susceptible to inflammation (enthesitis) with lateral hip pain. Additionally, the sacroiliac joints in the pelvis may be affected; The symptoms manifest themselves as deep buttock pain, often on both sides, and tend to increase with rest.

• Synovitis: inflamed joint lining in the hip joint
• Enthesitis: Inflammation of the tendon insertion, often lateral to the trochanter
• Sacroiliitis: Inflammation of the sacroiliac joints with buttock pain
• Muscular imbalance: protective tension and reduced function

Symptoms and typical courses

Psoriatic arthritis presents a variable picture. If the hip is involved, the focus is on deep groin or buttock pain, stiffness and limited mobility. Pain can increase at night and at rest and radiate to the front of the thigh. In enthesitis of the trochanter, tenderness on the outside of the hip and pain when lying on the side are typical.

• Inflammatory pain: worse at rest/at night, improved with exercise
• Morning stiffness, start-up pain
• Swelling/effusion in the hip joint (rarely visible, more palpable or on ultrasound)
• Buttock pain in sacroiliitis, often reciprocal
• Accompanying symptoms: skin flare-ups, nail changes, fatigue, eye inflammation (rare)

The course is often intermittent. Without treatment, there is a risk of structural damage such as loss of cartilage, capsule thickening and - if the disease lasts for a long time - narrowing of the joint space. Early diagnosis is therefore important.

Causes and risk factors

Psoriatic arthritis occurs due to a miscontrolled immune reaction. Genetic factors and environmental factors interact. A direct prediction is not possible, but some connections are known.

• Genetics: familial accumulation; with axial involvement, HLA-B27 is more common
• Trigger: Infections, mechanical stimuli at tendon attachments (enthesitis), stress
• Lifestyle: Overweight, smoking and lack of exercise promote activity and progression
• Psoriasis of the skin or nails as a risk marker (PsA can occur even without visible psoriasis)

Diagnostics: step by step to the diagnosis

We combine anamnesis, clinical examination and imaging. It is crucial to differentiate between inflammatory and wear-related causes and to rule out differential diagnoses. The classification is carried out in coordination with rheumatology.

Important: An acute, extremely painful, red and hot joint with fever can indicate bacterial arthritis and must be clarified as an emergency.

Differential diagnoses for hip pain

• Rheumatoid arthritis of the hip
• Coxarthrosis (wear and tear)
• Reactive arthritis after infections
• Gout/calcium pyrophosphate crystals
• Trochanteric bursitis and gluteal tendinopathy
• Aseptic femoral head necrosis
• Septic arthritis (emergency)
• Nonspecific axial spondyloarthritis

Therapy: conservative first – individually graded

The aim is to reduce pain and inflammation, maintain mobility and avoid subsequent damage. We start conservatively and coordinate the further medication strategy on an interdisciplinary basis. A promise of healing is not possible; However, many patients achieve good disease control.

• Education & self-management: Recognize relapse patterns, keep activity logs, apply heat/cold in a targeted manner.
• Physiotherapy: joint mobilization, strengthening of the buttocks and trunk muscles, stretching of the hip flexors – adapted to the inflammatory activity.
• Movement therapy: cyclical, joint-friendly endurance (cycling, swimming, aqua jogging) 2–3 times/week.
• Aids: Walking stick contralateral, temporary relief; ergonomic adjustments in everyday life.
• Weight management & tobacco cessation: supports inflammation modulation and joint relief.
• Pain and inflammatory medications: NSAIDs (e.g., ibuprofen, naproxen) or COX-2 inhibitors short-term; Pay attention to stomach protection and individual risks.

If purely orthopedic basic therapy is not sufficient, disease-modifying drugs (DMARDs) are considered via rheumatology.

• csDMARDs: e.g. B. methotrexate, sulfasalazine – v. a. with peripheral joint involvement.
• Biologics/tsDMARDs: e.g. B. TNF or IL-17 inhibitors, JAK inhibitors if the response is inadequate; Indication and monitoring by rheumatology.
• Treatment goal: low disease activity/remission (treat-to-target) with regular monitoring.

Local injections: targeted and image-guided

In the case of focal inflammation, ultrasound- or X-ray-guided injections may be an option, particularly to bridge the gap until systemic therapy takes effect. We weigh the benefits and risks individually.

• Intra-articular corticosteroid injection into the hip joint for severe synovitis (rare and not repeated at short intervals).
• Infiltration of the trochanteric bursa in lateral hip pain due to enthesitis.
• Hyaluronic acid and PRP: Evidence for hip PsA is currently limited; not standard. If there are accompanying tendinous complaints, PRP can be discussed on a case-by-case basis.

Contraindications (e.g. acute infection) are excluded. Information about possible side effects (e.g. temporary increase in pain, bruising, rarely infection) is provided in advance.

Surgical options – only if damage is advanced

Surgery is not the first priority for psoriatic arthritis of the hip. If there is severe joint destruction and persistent loss of function despite adequate conservative and systemic therapy, a hip endoprosthesis (THA) may make sense. The decision is made carefully in an interdisciplinary manner. The aim is to relieve pain and restore resilience.

• Arthroscopy: rarely effective in PsA.
• THA: Option for structurally advanced destruction with significant limitations.
• Postoperative management: Continuation/adjustment of rheumatism therapy in coordination with rheumatology and surgery.

Everyday life, training and self-help

Consistent, inflammation-adapted activity is a key. Overload should be avoided, as should inactivity. Structured exercises support joint function and pain reduction.

• Mobility: gentle hip rotations, pelvic tilts, hip flexor/gluteal stretching.
• Strength: isometric glute and abduction exercises, later band-based strengthening.
• Endurance: Cycling, cross trainer or swimming 20-30 minutes, 2-3 times/week.
• Ergonomics: Adjust seat height, frequent position changes, non-slip shoes.
• Warmth/cold: Warmth for stiffness, cold for acute inflammation - depending on what subjectively improves.
• Nutrition: balanced, Mediterranean-style diet; Losing weight if you are overweight can noticeably reduce symptoms.

Prognosis and course

The course of psoriatic arthritis is individual. Many affected people benefit from early, consistent treatment and remain resilient in everyday life. Relapses are possible. Regular follow-up checks help to secure therapy goals (low activity) and avoid consequential damage.

• Favorable factors: early diagnosis, adherence to therapy, active lifestyle.
• Unfavorable factors: persistently high inflammatory activity, smoking, untreated concomitant diseases.
• Monitoring: clinical scores, imaging if necessary, control of medication side effects.

When you should see a doctor

• Acute, severe hip pain with fever, redness/warmth or significant limitation of movement
• New, persistent buttock pain at rest/night with morning stiffness > 30 minutes
• Sudden inability to put any weight on the leg
• Eye redness with pain/vision problems (possible uveitis) – clarify quickly
• Increasing swelling or pain despite treatment