Please select the eligibility criteria that correspond to the clinical trial below.
Title: The Management of Intracapsular Fractures of the Proximal Femur. A Prospective, Randomized Trial of Two Parallel Screws and Hemiarthroplasty
Brief Summary: An estimated 1.6 million patients sustain a hip fracture every year, about half of these are intracapsular femoral neck fractures. A femoral neck fracture is a life changing event for any patient, and the risk of disability, increased dependence and death is substantial. The main treatment options for displaced femoral neck fractures are internal fixation and arthroplasty. It is established that there are more complications and reoperations after internal fixation, but there is no consensus about which procedure that gives best functional results.


Options:
A: Inclusion Criteria:

* Displaced femoral neck fracture
* Age 60 or above
* Able to walk (any aids allowed)

Exclusion Criteria:

* Anesthesiologically unfit for arthroplasty surgery
* Previous symptomatic hip pathology (i.e. arthritis)
* Pathological fracture
* Delay of more than 96 hours from injury to treatment
* Not living in hospital area
B: Inclusion Criteria:

* Acute displaced femoral neck fracture of hip (Garden classification 3-4)
* Independent walker with or without walking aides
* Patient willing to participate in the study and give written consent.

Exclusion Criteria:

* Fracture older than 36 hours before admission
* Osteoarthritis in the fractured hip
* Rheumatoid arthritis in the fractured hip
* Pathological fractures
* Contraindication for hip arthroplasty surgery
* Not suitable for inclusion for other reasons e.g. substance abuse
C: Inclusion Criteria:

* Adult men or women aged 50 years and old (with no upper age limit)
* Fracture of the femoral neck, as confirmed with either anteroposterior or lateral hip radiographs, computed tomography, or magnetic resonance imaging (MRI)
* Displaced fracture that is not, in the judgment of the attending surgeon, optimally managed by reduction and internal fixation
* Operative treatment is planned within 72 hours of the patient being medically cleared for surgery
* Patient was ambulatory prior to the fracture, though they may have used an aid such as a cane or a walker
* Anticipated medical optimization for arthroplasty of the hip
* Provision of informed consent by patient or proxy
* Low energy fracture (defined as a fall from standing height), with no other trauma
* Assurance from site that surgeons with expertise in both total hip arthroplasty and hemi-arthroplasty are available to perform surgery (Note: Surgeons do not need to be experts in both techniques)

Exclusion Criteria:

* Not suitable for hemi-arthroplasty (i.e., inflammatory arthritis, rheumatoid arthritis, pathologic fractures (secondary to cancer), or severe osteoarthritis of the hip)
* Associated major injuries of the lower extremity (e.g., ipsilateral or contralateral fractures of the foot, ankle, tibia, fibula, knee, or femur; dislocations of the ankle, knee, or hip; or femoral head defects or fracture)
* Retained hardware around the affected hip that will interfere with arthroplasty
* Infection around the hip (soft tissue or bone)
* Bone metabolism disorder except osteoporosis (e.g., Paget's disease, renal osteodystrophy, osteomalacia)
* Patients with a previous history of frank dementia that would interfere with the assessment of primary outcome (e.g., secondary procedures at 2 years).
* Likely problems, in the judgment of the investigators, with maintaining follow-up (e.g., no fixed address, plans to move out of town in the next year, or intellectually challenged and without adequate family support)
* Enrolled in another ongoing drug or surgical intervention trial
* Patients whose fracture occurred as a result of violence.
D: Inclusion Criteria:

Patients \>75 years old who were diagnosed with impacted femoral neck fracture with confirmation of mutual embedding and close combination of the fracture ends by CT or MRI scanning(including Garden 1 and 2 and varus impacted FNF) were eligible for the inclusion.

Exclusion Criteria:

Patients \<75 years old, pathological fracture, nonimpacted or displaced fracture, unable to walk previously, avascular necrosis of femoral head, previous symptomatic hip pathology (such as arthritis), infection, a history of fracture in the studied hip, deformity of lower limb.

Answer: A