Please select the eligibility criteria that correspond to the clinical trial below.
Title: Do Dual Mobility Cups Prevent Dislocation After Total Hip Arthroplasty Performed Due to Femoral Neck Fracture? a Registry-based, Pragmatic, Randomized Controlled Trial Comparing Dual Mobility with Standard Cups
Brief Summary: Our aim is to develop a strategy that reduces the risk of dislocations after total hip arthroplasty surgery performed due to femoral neck fracture. We therefore perform a register-nested, pragmatic, randomized controlled trial to investigate the safety and efficacy of dual mobility cups that were designed to minimize the risk of dislocation in the large and fragile group of elderly patients with femoral neck fractures.


Options:
A: 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.
B: Inclusion Criteria:

* Acute Displaced femoral neck fracture
* Subject is aged between 65-79 years
* Independent walker with or without walking aides
* Subject is able and capable of providing consent to participate in the study

Exclusion Criteria:

* Patients with Rheumatoid Arthritis
* Patients with an impaired cognitive dysfunction
* Patients with Pathological fractures
* Patients with substance abuse
* Patients with fracture older than 36-hours on arrival at the A\&E
* Patients suffering from cancer
* Patients determined by principal investigator to be unsuitable for inclusion
C: 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
D: Inclusion Criteria:

* Written informed consent
* Diagnosis: displaced femoral neck fracture type AO 31-B2 or B3/Garden type 3 or 4
* Eligible for THA according to local guidelines and routines

Exclusion Criteria:

* Previous inclusion of contralateral hip
* Delayed fracture surgery (date of injury \>7 days prior to date of randomization)
* Pathological or stress fracture of the femoral neck, or fracture adjacent to a previous ipsilateral hip implant
* Inability or unwillingness to give written consent
* Dementia (as diagnosed by the screening physician)
* Unavailability of both interventions for a study subject (e.g., implants being out of stock, or lack of the individual surgeon's expertise to perform either procedure)

Answer: D