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The TRIP (Thromboembolic Risk In Plaster) Score assesses VTE (venous thromboembolism — DVT/PE) risk in patients immobilized in cast or splint following lower extremity injury. Lower extremity immobilization (cast, splint, boot) is a well-established VTE risk factor. The TRIP Score stratifies patients into low, medium, or high risk categories to guide decision-making regarding VTE chemoprophylaxis during immobilization. Derived from a Dutch study (CAST study population).
Age ≥ 62 years
BMI ≥ 30 kg/m²
Personal history of DVT or PE
Family history of VTE (1st degree relative with DVT/PE)
Active malignancy (any cancer diagnosis)
Current oral contraceptive pill or hormonal therapy (estrogen-containing)
Injury type requiring immobilization
Non-weight-bearing immobilization (full non-weight-bearing ordered)
Expected duration of immobilization > 4 weeks
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