Differential Diagnosis Classification
Juvenile idiopathic arthritis requires meticulous clinical exclusion of other diseases.
Table 1: Differential Diagnosis Of Childhood Arthritis
| Disease Category | Specific Conditions |
|---|---|
| Infectious Diseases | Septic arthritis, viral arthritis (rubella, parvovirus B19, Epstein-Barr virus, hepatitis B), Lyme disease, osteomyelitis, endocarditis,. |
| Reactive And Post-Infectious | Acute rheumatic fever, reactive arthritis (enteric or urogenital triggers), transient synovitis of the hip,. |
| Rheumatic And Autoimmune | Systemic lupus erythematosus, juvenile dermatomyositis, scleroderma, IgA vasculitis, Kawasaki disease, sarcoidosis, mixed connective tissue disease,. |
| Neoplastic Disorders | Leukemia, neuroblastoma, lymphoma, bone tumors,. |
| Orthopedic And Mechanical | Trauma, growing pains, hypermobility syndromes, Legg-Calve-Perthes disease, slipped capital femoral epiphysis, chondrolysis,. |
| Autoinflammatory Syndromes | Periodic fever syndromes, macrophage activation syndrome, familial Mediterranean fever,. |
| Immunodeficiencies | Hypogammaglobulinemia, IgA deficiency, common variable immunodeficiency. |
| Congenital And Metabolic | Gout, mucopolysaccharidoses, thyroid disease, scurvy, skeletal dysplasias,. |
Differentiating Features
- Acute rheumatic fever causes exquisitely painful, migratory polyarthritis.
- Malignancy exhibits nocturnal bone pain awakening children from sleep.
- Malignancy demonstrates disproportionate pain relative to physical findings.
- Leukemia presents with leukopenia, low-normal platelets, and high erythrocyte sedimentation rate (ESR).
- Bone marrow examination remains mandatory confirming malignant infiltration.
- Transient synovitis causes acute hip pain following viral infections.
- Septic arthritis presents as an acute, painful, erythematous, hot single joint.
- Synovial fluid aspiration excludes septic arthritis definitively.
Management Principles
Treatment Goals
- Achieve complete disease remission.
- Prevent or halt joint damage and deformities.
- Foster normal psychosocial and physical growth.
Pharmacological Interventions
Table 2: Pharmacotherapy Agents And Indications
| Drug Class | Specific Agents | Clinical Indications And Notes |
|---|---|---|
| Non-Steroidal Anti-Inflammatory Drugs (NSAIDs) | Naproxen, ibuprofen, meloxicam | Initial symptomatic therapy relieving pain and stiffness,. |
| Glucocorticoids | Triamcinolone hexacetonide (intra-articular), prednisolone (systemic) | Intra-articular injection preferred for oligoarthritis. Systemic route serves as bridge therapy or controls severe systemic JIA,. |
| Conventional Synthetic DMARDs | Methotrexate, sulfasalazine, leflunomide | Methotrexate anchors treatment for polyarthritis and extended oligoarthritis. Sulfasalazine targets enthesitis-related arthritis. |
| Biologic DMARDs (Anti-TNF) | Etanercept, adalimumab, infliximab, golimumab | Targets polyarthritis refractory to methotrexate. Adalimumab preferred treating associated uveitis,. |
| Biologic DMARDs (Anti-IL-1) | Anakinra, canakinumab | Highly effective treating systemic JIA,. |
| Biologic DMARDs (Anti-IL-6) | Tocilizumab | Manages systemic JIA and macrophage activation syndrome,. |
| T-Cell Modulators | Abatacept | Inhibits T-cell activation treating polyarticular JIA,. |
| Small Molecules (JAK Inhibitors) | Tofacitinib | Treats polyarticular JIA targeting intracellular signaling,. |
Subtype-Specific Approach
- Oligoarthritis management utilizes NSAIDs or intra-articular corticosteroids initially.
- Methotrexate addition indicated for extended oligoarthritis or refractory disease.
- Polyarthritis demands early aggressive therapy utilizing methotrexate.
- Biologic tumor necrosis factor (TNF) antagonists added upon methotrexate failure.
- Systemic JIA therapy utilizes corticosteroids alongside interleukin-1 or interleukin-6 antagonists.
- Enthesitis-related arthritis responds to NSAIDs, sulfasalazine, and TNF inhibitors,.
- Macrophage activation syndrome requires pulse intravenous methylprednisolone and cyclosporine,.
Multidisciplinary Rehabilitation
- Physical therapy prevents fixed flexion contractures and maintains joint mobility.
- Occupational therapy provides customized splints facilitating activities of daily living.
- Routine slit-lamp ophthalmologic screening mandatory detecting asymptomatic uveitis,.
- Nutritionist consultation addresses growth failure and osteopenia secondary to chronic inflammation.
- Psychosocial support essential addressing depression, school absenteeism, and chronic pain impact,.