A Study Comparing the Reliability of Measurements of the Ischiofemoral (hip) Space Between Ultrasound Operators with Different Levels of Experience


About this study

The ischiofemoral space (IFS) has been evaluated with radiographs, CT, and magnetic resonance imaging (MRI). Recent studies have questioned the reliability of IFS measurements taken without controlling hip position. In recent years the utilization of outpatient musculoskeletal ultrasonography (MSK US) increased has increases dramtically. MSK US offers many benefits to a musculoskeletal practice, including rapid diagnosis of disorders of bones, joints, tendons, muscles, ligaments, blood vessels, and nerves, as well as the ability to guide interventions to treat these structures. The primary aim of this study is to evaluate the inter-rater and intra-rater reliability of US measurements of the IFS.  A secondary aim is to determine whether operator experience affects the inter-rater or intra-rater reliability of these measurements. 

Participation eligibility

Participant eligibility includes age, gender, type and stage of disease, and previous treatments or health concerns. Guidelines differ from study to study, and identify who can or cannot participate. There is no guarantee that every individual who qualifies and wants to participate in a trial will be enrolled. Contact the study team to discuss study eligibility and potential participation.

Inclusion Criteria

  • Operators
    • 3 Physical Medicine and Rehabilitation (PM&R) residents from post-graduate year 2
    • 3 PM&R residents from post-graduate year 4
    • 3 PM&R consultants 
  • Models
    • 18 to 65 years of age

Exclusion Criteria

  • Operators
    • Any condition that limits the ability to operate an Ultrasound transducer or use the electronic calipers on the US machine
  • Models
    • Hip or knee mobility restriction preventing study positioning
    • Current or prior history of buttock, hip or groin pain requiring activity modification or medical treatment
    • History of hip or pelvic fractures
    • Body mass index (BMI) greater than 30
    • History of hip or pelvis surgery

Participating Mayo Clinic locations

Study statuses change often. Please contact the study team for the most up-to-date information regarding possible participation.

Mayo Clinic Location Status

Rochester, Minn.

Mayo Clinic principal investigator

Jonathan Finnoff, D.O.

Closed for enrollment

More information


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