Please select the eligibility criteria that correspond to the clinical trial below.
Title: Efficacy of RIvaroxaban for Prevention of Venous Thromboembolism After Knee Arthroscopy: a Randomized Double-blind Trial (ERIKA Study)
Brief Summary: Study Objective: To assess the value of Rivaroxaban for the prevention of venous thromboembolism (VTE) after knee arthroscopy (KA) taking the placebo as standard of reference.

Study Population: Patients undergoing therapeutic KA at the study Centers, irrespective of the type and duration of the procedure, will be eligible for the study.

Study Design: Multicenter, randomized, double blind superiority, phase II trial comparing two arms:

* (R-7d) Rivaroxaban (10 mg od os) for 7 days
* (PL-7d) Placebo for 7 days.

Follow-up: 3-month period after the randomization

Standard of Reference:Placebo will be the standard of reference in accordance to international guidelines

Study length May 2012-December 2012

Total patients number: 500 patients

Primary Efficacy End-Point: Occurrence in the 3-month period after the randomization of at least one of the following events, objectively proven (by means of CCDU; multi-slice chest TC-angio; autopsy, if necessary, or clinical ground):

* All-cause mortality
* Symptomatic VTE
* Asymptomatic proximal DVT

Secondary Efficacy End-point:

• Combined incidence of all DVT plus symptomatic PE

Primary Safety End-point: Incidence of major bleedings.

Secondary Safety End-point: Overall incidence of bleeding


Options:
A: Inclusion Criteria:

* Meniscectomy
* Diagnostic Arthroscopy
* Removal of corpora libera

Exclusion Criteria:

* Contra-indications for LMWH use (recent major bleeding, bleeding disorder, allergy)
* Pregnancy
* Pre-existent indication for anticoagulation therapy, either LMWH or vitamin K antagonists.
* History of venous thromboembolism (indication for anticoagulation therapy for prophylaxis of recurrence)
* Mental of physical disability to fulfill study requirements
* Insufficient knowledge of the Dutch language
* Previous participation in the Pot-(K)Cast study
B: Inclusion Criteria:

All patients in need of immobilization of the lower leg with a plaster cast (or equivalent of a cast) for a minimum of one week for the following indications:

* Trauma of the lower leg
* Surgery of the lower leg followed by lower leg immobilization with a plaster cast
* Non-traumatic indications

Exclusion Criteria:

* Contra-indications for LMWH use (recent major bleeding, bleeding disorder, allergy)
* Pregnancy
* Pre-existent indication for anticoagulation therapy, either LMWH or vitamin K antagonists.
* History of venous thromboembolism (indication for anticoagulation therapy for prophylaxis of recurrence)
* Mental of physical disability to fulfill study requirements
* Insufficient knowledge of the Dutch language
* Previous participation in the Pot-(K)Cast study
C: Inclusion Criteria:

* a current diagnosis of autism, Asperger syndrome, atypical autism according ICD-10 criteria confirmed by specialized clinical assessment;
* presenting severe behavioural disturbances such as hetero and self-injurious behaviours, automutilation, severe motor hyperactivity, severe stereotypies.
* having a systematically consultation by a neuro pediatric.

Exclusion Criteria:

* children with known organic syndrome and/or non-stabilized neuropediatric (e.g. seizures) or medical (e.g. diabetes mellitus) comorbidities.
* patients with stabilized seizure condition, antiepileptic medication should be stable for at least 4 weeks.
D: Inclusion Criteria:

1. Adult patient (18 years and older)
2. Knee arthroscopy not combined with open surgery.
3. Patients eligible for surgical treatment.
4. Patients are willing and able to continue study participation to ensure completion of all procedures and observations required by the study.
5. Written informed consent

Exclusion Criteria:

1. Diagnostic arthroscopy
2. Patients concomitantly treated systemically with strong concurrent CYP3A4 and P-gp-inhibitors, i.e. azole-antimycotics or HIV protease inhibitors.
3. Hypersensitivity to the active substance or to any of the excipients of study drug
4. Pregnant women or breast-feeding.
5. Hepatic disease associated with coagulopathy and clinically relevant bleeding risk
6. Known thrombophilia (hereditary or acquired)
7. Mandatory anticoagulation.
8. Known severe bleeding tendency
9. Clinically significant active bleeding.
10. Severe renal failure (GFR\<30mL/min/1.73m2)
11. Patients participating in another clinical trial.
12. Recent mayor surgery (6 to 12 weeks)

Answer: D