Reactive arthritis Flashcards
1
Q
Reactive arthritis generalities
A
- Associated with conjunctivitis and urethritis.
- Males 15 to 35 years of age.
- Transmitted through either epidemic dysentery or sexual intercourse.
2
Q
Radiologic classic findings of reactive arthritis
A
- Fusiform soft tissue swelling.
- Normal mineralization.
- Uniform joint space loss.
- Bone proliferation.
- Ill-defined erosions
- Bilateral asymmetrical.
- Affects: feet, ankles, sacroiliac, joints, hands, hips and spine.
3
Q
Feet involvement of reactive arthritis
A
- The most frequently involved joints are the small articulations of the foot and the calcaneus.
- The arthritis is initially seen involving one joint only.
- Swelling of an entire digit.
- Early, a periostitis of the shafts of the phalanges may occur.
- Uniform space loss and marginal erosions with adjacent bone proliferation occur.
- Ankylosis of joints is rare.
- Reactive arthritis seems to prefer MCP and first IP over DIP and PIP seen in psoriatic arthritis
- Calcaneus is affected in 50% of patients, often it may be the only bone ever involved,.
4
Q
Ankle involvement of reactive arthritis
A
- 30-50% of patients.
- Soft tissue swelling and fluffy periostitis involving the distal ends of the fibula and tibia.
- Uniform space loss may occur.
- Erosive disease is rare.
5
Q
Knee involvement of reactive arthritis
A
- 40% of patients.
- Most common finding is joint effusion.
- Juxta articular osteoporosis, eventually replaced with normal mineralization.
- Bone production observed as periostitis or ossification of ligamentous and tendinous attachments.
6
Q
Hands involvement of reactive arthritis
A
- Often limited to one digit.
- Radiographic changes are identical to those seen in psoriatic arthritis.
- PIP joints are more requient involved than DIP or MCP joints.
7
Q
Sacroiliac joint involvement of reactive arthritis
A
- Early disease only 5-10 % of patients, late disease 40-60%.
- Bilateral and asymmetrical.
- DD: Septic arthritis.
