HIP: Hip Imaging Protocol

Study Overview
=================
Brief Summary
-----------------
Objective measures of skeletal muscle features have previously been used to assess skeletal muscle quality. In certain clinical populations, such as intensive care (ICU) patients, specific features of the psoas muscle measured by abdominal CT have been used to assess the nutritional status of the patient. Abdominal CT is not performed routinely as it exposes the patient to ionizing radiation (X-rays) and can only be performed intermittently. The measurement of the thigh muscles (rectus femoris muscle, part of the quadriceps muscle) by handheld musculoskeletal (MSK) ultrasound is a simple, safe (no ionizing radiation) and repeatable (can be easily performed on a daily basis) technique. A correlation has been shown between muscle parameters of the psoas muscle (abdominal CT) and the rectus femoris muscle (MSK). A direct comparison between muscle parameters of the same skeletal muscle measured with both CT and MSK has not been done. Intramuscular adipose tissue (IMAT) is a measure of the extent of adipose tissue deposited within the muscle. It is a biomarker of muscle quality. The study objective is to compare muscle area and intramuscular adipose tissue (IMAT) content of rectus femoris muscle, measured by standard CT imaging with point of care handheld musculoskeletal (MSK) ultrasound in patients presenting for primary total hip arthroplasty. This patient group is chosen because they will have hip CT performed as standard of care prior to surgery.

Detailed Description
-----------------
In our institution, all primary total hip arthroplasty patients receive abdominal CT that encompasses their hip as part of the standard clinical evaluation for hip surgery. This provides an opportunity to perform an MSK ultrasound at the same time. Both CT and MSK have established imaging techniques of soft tissue. Both techniques provide a 2D digital slice representation. Although the image is black and white, there are a large number of intervals, up to 255, between the two extremes of black and white, termed grayscale. The application of an algorithm based upon the grayscale is used to define the different characteristics of the muscle, e.g. striated muscle versus fat infiltration. The algorithms used to measure muscle characteristics are entirely dependent on the originating imaging source. This means that an estimate of adipose using the CT algorithm is entirely independent of the algorithm applied to the MSK estimation of adipose. This study, therefore, aims to determine how well the two imaging techniques correlate with each other when IMAT is measured by the two separate techniques.

Official Title
-----------------
HIP: Hip Imaging Protocol: the Comparison of Muscle Ultrasound-derived Parameters With CT Imaging-derived Parameters in Primary Total Hip Arthroplasty Patients.

Conditions
-----------------
Metabolic Profiling Muscle

Intervention / Treatment
-----------------
* Procedure: CT
* Device: Ultrasound


Participation Criteria
=================
Eligibility Criteria
-----------------
Inclusion Criteria: Primary hip replacement Exclusion Criteria: Revision hip replacement Ipsilateral knee replacement

Ages Eligible for Study
-----------------
Minimum Age: 18 Years

Sexes Eligible for Study
-----------------
All

Accepts Healthy Volunteers
-----------------
No

Study Plan
=================
How is the study designed?
-----------------

Design Details

Primary Purpose: Other
Allocation: Non-Randomized
Intervention Model: Crossover Assignment
Masking: None (Open Label)


Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| Active Comparator: CT<br>Patients have standard of care CT prior to primary hip replacement | Procedure: CT<br>* standard of care CT prior to primary hip replacement<br>|
| Experimental: Ultrasound<br>Patients have ultrasound scans together with standard of care CT prior to primary hip replacement | Device: Ultrasound<br>* Ultrasound scan together with standard of care CT prior to primary hip replacement<br>|

What is the study measuring?
-----------------
Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| All IMAT | CT-derived area of intramuscular adipose tissue in cm2 | visit 1, up to 1 hour | 
| %IMAT | Ultrasound-derived area of intramuscular adipose tissue in % | visit 1, up to 1 hour | 

 Terms related to the study
=================
Keywords Provided by Centre Hospitalier Valida
-----------------
muscle, ultrasound, CT, MuscleSound