Coxitis: Inflammation of the hip joint

What is Coxitis?

In coxitis, the joint lining (synovium) of the hip is inflamed. A hip effusion often forms that fills the inside of the joint and causes pain and restricted movement. Depending on the cause, a distinction is made between non-infectious inflammations (e.g. rheumatic, reactive, crystal-related gout) and infectious forms (bacterial).

• Non-infectious: e.g. B. reactive inflammation after infections, rheumatic diseases, gout/chondrocalcinosis, overwork.
• Infectious: bacterial joint infection (septic coxitis) – orthopedic emergency.

Anatomy: Why hip inflammation is so painful

The hip joint is a ball-and-socket joint made up of the femoral head (thigh bone) and socket (pelvis). The articular surfaces are covered with cartilage and the capsule encloses the joint. Inside lies the synovium, which forms synovial fluid. When this layer becomes inflamed, it swells, produces more fluid and releases inflammatory mediators. The resulting pressure in the joint leads to stabbing pain, especially during twisting and bending movements.

• Articular cartilage: absorbs loads, is affected by long-term inflammation.
• Joint capsule/synovial fluid: headquarters of inflammation – source of effusion and pain.
• Labrum (socket lip): stabilizes the hip; Associated lesions are possible but not typically caused by coxitis.

Typical symptoms

• Acute or gradual groin pain, sometimes radiating to the buttocks, thighs or to the knee
• Pain when moving and significant limitation of internal rotation, flexion and extension
• Limping, inability to walk if severe
• Pressure pain in the groin, painful turning pain
• Warming/swelling is often not visible externally
• General symptoms possible: fatigue, subfebrile temperatures; in bacterial coxitis usually fever and pronounced illness

Warning signs of possible bacterial joint inflammation include severe pain at rest, high fever, chills, rapidly increasing symptoms, redness/warmth, and a history of infection, surgery, injections, or immunosuppression. A quick medical evaluation is then required.

Children often show posture, limp or refuse to walk. The so-called “Coxitis fugax” (temporary hip inflammation) is common in children and is usually benign, but must be differentiated from serious causes.

Causes of Coxitis

• Reactive/post-infectious: delayed after viral or bacterial infections (respiratory tract, intestinal, urinary tract).
• Inflammatory rheumatic: e.g. B. Rheumatoid arthritis, psoriatic arthritis, spondyloarthritis (Bechterew's disease), juvenile idiopathic arthritis.
• Crystal arthropathies: gout (uric acid crystals), chondrocalcinosis (calcium pyrophosphate).
• Mechanical factors/overload: Accompanying synovitis in structural hip diseases.
• Infectious (septic coxitis): bacterial colonization of the joint, e.g. B. via the bloodstream or after interventions/injuries – emergency.
• Special cases: Lyme arthritis (Lyme disease), tuberculosis (rare, in risk constellation).

Structural hip diseases such as hip dysplasia, femoroacetabular impingement (FAI) or labral lesions can promote recurring irritation. Advanced coxarthrosis is also often accompanied by inflammatory phases (activated osteoarthritis).

Diagnostics: targeted and safe

The aim is to quickly narrow down the cause of the inflammation - in particular to rule out a bacterial infection. We combine history, physical examination, laboratory and imaging. If septic coxitis is clinically suspected, joint puncture is a priority.

In children, clinical criteria and sonography help to assess the risk of a septic cause. Unclear or serious courses are clarified in an interdisciplinary manner (e.g. with pediatrics/children's rheumatology).

Therapy: conservative first

Treatment depends on the cause. Non-infectious coxitis usually responds to consistent conservative therapy. The goals are to relieve pain, reduce inflammation, maintain mobility and protect the articular cartilage.

• Acute phase: relative protection, relief with forearm crutches, cool compresses (if comfortable).
• Medication: anti-inflammatory painkillers (NSAIDs) as recommended by a doctor; Pay attention to stomach/kidney risks and interactions.
• Physiotherapy: in the subacute phase, joint-friendly mobilization, soft stretches, strengthening of the hip stabilizers (gluteal muscles, trunk), gait training.
• Adaptation to everyday life: temporary reduction in stressful activities, ergonomic tips (e.g. standing up with relief from the hips).
• Treatment of the underlying disease: e.g. B. rheumatological basic therapy (DMARDs/biologics) in cooperation; Uric acid reduction in gout via family doctor/rheumatology.

Coxitis fugax in children is often self-limiting. Rest, symptom-oriented pain therapy and follow-up monitoring are sufficient in many cases; If the condition worsens or fever occurs, further medical evaluation is important.

Special case: septic coxitis (bacterial hip inflammation)

A bacterial infection of the hip joint is an emergency because cartilage can be damaged within a short period of time. Rapid diagnosis with joint puncture and rapid therapy are required.

• Antibiotic therapy after pathogen and resistance detection; initially calculated, then targeted.
• Often surgical joint irrigation (arthroscopic/via a small access) and drainage to reduce the bacterial load.
• Accompanying: relief, pain therapy, close clinical and laboratory monitoring.
• After it has subsided: careful physiotherapeutic reconstruction.

The specific treatment is interdisciplinary (orthopedics, microbiology, if necessary infectious diseases) and is determined individually.

Injections and regenerative procedures: when does it make sense?

Intra-articular injections can be considered for selected non-infectious hip infections - always after a bacterial cause has been ruled out.

• Cortisone injection: can quickly calm severe synovitis, e.g. B. during inflammatory attacks. Implementation with image support, information about rare risks (infection, increase in blood sugar).
• Hyaluronic acid: discussed for symptom relief in accompanying osteoarthritis; Data situation heterogeneous. Use after an individual benefit-risk assessment.
• Autologous blood/PRP: sometimes used for hipperiarticular pain and osteoarthritis; for acute coxitis, evidence is limited. Do not use if infection is suspected.

We provide you with transparent advice on the opportunities and limitations of these procedures and, where appropriate, use them as a supplement to basic measures.

Physiotherapy and training

After the acute inflammation has subsided, a structured structure supports joint health. The goal is good muscular control of the hip and pain-free everyday resilience.

• Mobilization that is gentle on the joints (e.g. active/assistive movements, bicycle ergometers without high loads).
• Strengthening gluteus medius/maximus, core stability, hip flexor balance.
• Coordination/proprioception to improve the pelvic-leg axis.
• Everyday and sports progression in stages, relapse prevention through home exercise program.

Course and prognosis

• Coxitis fugax: usually good, self-limiting course within days to a few weeks.
• Reactive/inflammatory coxitis: variable depending on the underlying disease; Often easily controllable with targeted therapy.
• Crystal arthropathies: tend to flare up; Seizure prophylaxis reduces the risk of recurrence.
• Septic coxitis: serious; Prognosis depends on very rapid diagnosis and therapy.

The earlier inflammation is recognized and treated, the easier it is to avoid pain, loss of function and subsequent damage to the cartilage.

What you can do yourself

• Reduce stress in the acute phase and use walking aids if necessary.
• Cold in the inflammatory phase, warm when the muscles are tense - depending on your personal preference.
• Only take painkillers as recommended by a doctor.
• Make sure you drink enough fluids and eat a balanced, low-inflammatory diet.
• Slow training build-up; Avoid jump and impact loads at first.

Self-measures do not replace a medical assessment - especially not in the case of fever, severe pain at rest or rapid deterioration.

Prevention and risk reduction

• Address risk factors: good blood sugar control, treatment of sources of infection, stopping smoking.
• Gout management: uric acid reduction and nutrition in coordination with family doctor/rheumatology.
• Regular exercise that is gentle on the joints (cycling, swimming), weight management.
• Strengthen hip muscles, optimize technique/load in sport.
• If you have structural hip problems (e.g. FAI, dysplasia), seek orthopedic advice.

When should you see a doctor?

• Acute, severe groin pain with pain at rest or at night
• Fever, chills, rapid increase in symptoms
• Restricted walking or even inability to walk
• Known immunosuppression, diabetes, recent hip surgery or injection
• Persistent hip pain > 1-2 weeks despite rest

Differentiation from related hip diseases

Not all hip inflammation is caused by osteoarthritis - and not all hip pain is coxitis. A differentiated diagnosis helps to provide targeted treatment.

• Coxarthrosis: degenerative wear of cartilage with possible inflammatory attacks (activated osteoarthritis).
• Capsulitis/Synovitis: Inflammation of the joint capsule/mucosa - overlaps with the term coxitis, often in the context of other hip diseases.
• FAI/labral lesion: mechanical entrapment/damage to the acetabular lip; can trigger reactive inflammation.
• Hip dysplasia: congenital insufficiency of the acetabular roof, leading to overloading and irritation.
• Coxa saltans externa: snapping hip due to tendon friction - more of a soft tissue irritation, no intra-articular inflammation.

Orthopedic help in Hamburg

We clarify hip pain in a structured manner and plan a tailor-made treatment that is as conservative as possible. If necessary, we include rheumatology, radiology or infectious diseases. Our practice is located at Dorotheenstraße 48, 22301 Hamburg. You can conveniently request appointments online or by email.