Comparison of the Use of Conventional Ancillary Reaming and Single-use Ancillary Reaming Material in Total Hip Replacement

Direct medical costing in both groups:

• Sterilization costs,
• Inventory management costs,
• Material costs,
• Waste management costs,
• Operating room costs based on room occupancy times.

Calculated from the beginning of the skin incision to closure and recorded on the anesthesia sheet

The patients were evaluated by the Modified Merle d'Aubigné and Postel Method, which evaluates pain, gait and mobility, on a scale of 1 to 6 for each item, where 1 indicates the worst and 6, the best state of the patient. The total minimum score reached is 3, and the maximum is 18.

This instrument has 10 items in 3 sections describing pain, function, range of motion, and deformity. The first section is questionnaire-based, answered by the patient, and includes impairments and activities. The second and third sections are administered by the therapist or physician, and include leg length measurement and range of motion (ROM) measures of the hip (flexion, abduction, external rotation and adduction). Each item has a unique numerical scale that corresponds to descriptive response options. The highest possible score is 100, with a higher score indicating less dysfunction.

Devane score: The purpose of this score is to specify the patient's activity level preoperatively. Initially established by Devane, it allows a classification of each patient in 5 categories from sedentary to athletic Charnley score: This is a commonly used score designed to assess the patient's overall disability in relation to gait function. It was published by Charnley and distinguishes patients into 3 categories

The Western Ontario and McMaster Universities Osteoarthritis Index (WOMAC) is a widely used, proprietary set of standardized questionnaires used by health professionals to evaluate the condition of patients with osteoarthritis of hip, including five items for pain (score range 0-20), two for stiffness (score range 0-8), and 17 for functional limitation (score range 0-68).

The hip disability and osteoarthritis outcome score (HOOS) is a questionnaire intended to be used to assess the patient's opinion about their hip and associated problems and to evaluate symptoms and functional limitations related to the hip during a therapeutic process. To interpret the score, the outcome measure is transformed in a worst to best scale from 0 to 100, with 100 indicating no symptoms and 0 indicating extreme symptoms.

The visual similar scale is auto completed. For the intensity of pain, the scale varies between "no pain" (the score of 0) and "most painful" (the score of 10).

Operator satisfaction score (numerical scale from 0 (not satisfied) to 10 (very satisfied)) of the material during the surgical procedure

realization of standard radiographs of the pelvis from the front, hip from the front and from the side. Analysis of the acetabulum according to Charnley and search for the presence of granulometry, migration or acetabular osteolysis. Measurement of the femoral and acetabular offset and height of the center of rotation

Analysis of possible intraoperative and postoperative complications and their costs: loosening, infection, dislocation, wear and implant fracture