Please select the eligibility criteria that correspond to the clinical trial below.
Title: Efficacy of Low-dose Intra-articular Tranexamic Acid in Total Knee Replacement; A Prospective Triple-blinded Randomized Controlled Trial.
Brief Summary: The purpose of this study is to determine 1) the effective dosage of intra-articular tranexamic acid injection for controlling blood loss and blood transfusion requirement in conventional total knee replacement, and 2) whether the blood loss reduction effect depended on the dose of tranexamic acid used.


Options:
A: Inclusion Criteria:

* patients diagnosed as primary knee osteoarthritis and underwent unilateral primary cemented conventional total knee replacement
* no risk of abnormal bleeding tendency or bleeding disorder (normal coagulogram, serum creatinine \< 2.0 mg/dL, stop nonsteroidal anti-inflammatory drugs and antiplatelet drugs more than 7 days
* no contra-indication for tranexamic acid use (no active intravascular clotting process, no acquired defective colour vision, no subarachnoid hemorrhage, no hypersensitivity to TXA, and no any of history of serious adverse effects, thrombotic disorder and hematuria)

Exclusion Criteria:

* incomplete data collection, for example, malfunctioned drain or accidental drain removal.
B: Inclusion Criteria:

- Adult patients undergoing unilateral total knee replacement

Exclusion Criteria:

* Absence of consent
* Tranexamic acid allergy
* Coagulopathy (preoperative platelet count \<150,000 / mm3, INR \[international normalized ratio\]\> 1.4, or prolonged partial thromboplastin time\> 1.4 times normal),
* History of arterial or venous thromboembolic disease (cerebrovascular accident, deep vein thrombosis or pulmonary thromboembolism),
* Hematological disorder (a hematopoietic, hemorrhagic or thrombogenic disease),
* Retinopathy (severe limitation of the field of vision and / or color distortion),
* Refusal to receive blood products
* Pregnancy
* History of convulsions
* Participation in another clinical trial.
C: Inclusion Criteria:

* Adult patients (greater than 18 years old)
* Patients scheduled for primary unilateral knee arthroplasty
* Patients for La Paz- Cantoblanco Hospital, Madrid, Spain

Exclusion Criteria:

* Patients that refuse to sign the Inform Consent
* Allergy to tranexamic acid
* Major comorbidities: Severe ischemic heart disease(class III and IV of New York Heart Association); sleep apnea syndrome; severe EPOC; renal dysfunction (plasma creatinine\>2mg/dL if mens and \>1.8mg/dL if woman); or hepatic disfunction.
* Coagulopathy (preoperative platelet count \<150,000/mm3, INR\>1.4, prolonged PPT(\>1.4 x normal)
* History of thromboembolic disease: CVA, DVT, PE
* Blood dyscrasias
* Retinopathy (disturbances of color vision)
* Jehovah's witnesses
* Pregnancy
* Breastfeeding
* Been participating or been participated a year ago in another clinical trial
D: Inclusion Criteria:

* Age: 18 - 85 years
* Sex: Both male and female will be included. The male-to-female ratio will depend upon the patient population.
* Stable Health: At the time of surgery based on physical examination and medical history.
* Patient exhibited preoperative radiographic evidence of joint degeneration consistent with TKA that could not have been treated in non-operative fashion.
* Patient had severe knee pain and disability due to degenerative joint disease.
* Patient or patient's legal representative has signed the Informed Consent form. The patient is capable of making informed decisions regarding his/her healthcare.

Exclusion Criteria:

* Patients with history of liver disease. Patients with liver dysfunction from cirrhosis or hepatitis may have impaired production of factors in the clotting cascade which may make these individuals more prone to bleed, especially with the use of anticoagulants. For this reason, these patients will also be excluded from this study if a baseline INR if greater than 1.3.
* Patients allergic to materials of bovine origin.
* Patients predonating autologous blood.
* Patients with a preoperative platelet count of less than 100,000.
* Patients undergoing bilateral or revision surgery.
* Evidence of bleeding or metabolic - based hemolytic disorder (hemophilia or anticoagulation use), or hypercoaguable disorder.
* Previous history of infection in the affected joint.
* Peripheral vascular disease.
* Patient was a poor compliance risk - treated for ethanol or drug abuse, physical or mental handicap, etc.
* Patients with a previous history of venous thromboembolism, or other reason for requiring anticoagulation other than ASA 325 mg po BID and mechanical compression.

Answer: A