The hip joint is entered from posterior, and the approach preserves the external rotators of the hip joint.

Oxford Hip Score(OHS) is a patient reported outcome measure( PROM), OHS is designed to assess outcome after total hip replacement. It has 6 questions on pain and 6 questions on mobility. 5 categories of answer from worst to best. The range is 0-48.

EuroQol-5d-5l is a descriptive system comprises 5 dimensions: Mobility, self-care, usual activities, pain/discomfort and anxiety/depression. Each dimension has 5 levels: no problems, slight problems, moderate problems, severe problems and extreme problems. This decision results in a 1-digit number that expresses the level selected for that dimension. The digits for the 5 dimensions can be combined into a 5-digit number that describes the patient's health state, and these digits can be converted into a single numerical value reflecting how the health state is according to the preferences of the general population of a country/region.

This is a test to identify weakness in gluteal muscles, that can be seen in patients after hip surgery. Unilateral weakness in the gluteal muscles can for instance because nerve damage, trauma to the muscle or rupture of the tendon. The test will be performed as described by Hardcastle and Wade. The patient will be asked to raise their foot from the ground with 30º of hip flexion. The patient will be instructed to raise the non-stance side of the pelvis as high as possible with the examiner supporting the patient by holding their hands if needed. If the patient is not able to maintain this position for 30 seconds, or not being able to raise the hip of the non-stance side to above the level of the stance-side, the Trendelenburg test is considered positive.

NMS consists of 3 questions about ambulation indoor, outdoor and the ability to go shopping. Each question has 4 alternative answers yielding 0-3 points, and the maximum score is 9.

The Short Physical Performance Battery is an assessment tool made specific for screening of physical function among older adults. SPPB has 3 different tests: Balance, walking speed and rising from a chair. Scorings range from 0-12, best possible is 12.

Unidimensional measure of pain intensity in adults, describing pain extreme from 0 no pain at all to 10 the worst pain imaginable.

Duration of the operation in minutes

A four-meter distance is marked on the floor, and the patients are instructed to walk this distance in their normal speed, as if they were walking down a street. The distance is walked twice, and the fastest speed is recorded. The subject can use any walking aids, and this is recorded.

In the repeated chair stand test the participants are asked to fold their arms across their chest (the armrests shall not be not used) and stand up from the chair 5 times. This is timed by the examiner, and points are given from 0 to 4

This will be recorded at day 1-3 for all patients. This score assesses the patients' early mobility by evaluating their ability to rise from bed, rise from a chair and walk indoor (walking aids permitted).

This test measures the time that the person uses to rise from a chair, walk three meters, turn around and walk back to the chair, and sit down again, turning 180 degrees. The person can use any mobility aids that he/she would normally use. The TUG test is being scored by the total time measured

Analgesia during the first calendar day after surgery will be recorded as morphine equivalents according to a calculation table published by the Norwegian Directorate of Health.

Any adverse events will be recorded during the whole study period

Days alive and at home will be measured at 4,12 and 24 months. Patients wish to stay most of their lives at home, this measurement will tell us how long they could stay home and if they came home after their hip fracture.

Question about the patient´s satisfaction of the current state of their hip, and another question on whether they consider the treatment of their hip fracture to be a success or failure. They will also record a visual analogue scale of their satisfaction with the result of the surgery, ranging from "very satisfied" to "very dissatisfied".

Units of blood transfusion given to the patient during admission

Conventional radiographs will be taken postoperatively and at 4 months according to the standardized procedures for post-operative hip examinations of the radiology department. Using specialized computer software (Sectra Workstation IDS7 v.21 with orthopedic templating module Sectra Orthostation v15.1, Sectra AB, Linköping, Sweden), leg length difference, and hip offset compared to the uninjured hip will be recorded. In patients with a contralateral hip fracture this is not possible, but some of these patients will have available pre-fracture examinations that can be utilized for comparison. Femoral stem varus/valgus angulation (frontal view) and retroversion/anteversion (lateral view) will also be recorded

Recorded with objective weight and height measurements.

Place of return from hospital will be recorded, and at later visits the type of dwelling since the last visit will be recorded. We will differentiate between institution dwelling and community dwelling.

Assessment of frail patients, grades from 1 (very fit patient) to 9 (terminally ill).