Femoro Acetabular ImpingementFAINCT01575964
Biomechanical Assessment of Femoroacetabular Impingement
An observational study of Femoro Acetabular Impingement, run by University of Utah at 1 site in United States.
Trial summary
The purpose of this study is to determine the influence of FAI abnormalities on hip joint biomechanics. Read more about this study
- Who is it for?
- Ages 18 to 35 yearsHealthy volunteers can take part
- Conditions the study is for
- Femoro Acetabular Impingement
- How many people
- 36 participants
- Where
- 1 siteUnited States
- Study dates
- Jan 2012to Dec 2028
- Phase
- Observational
- Are there results?
- Not yet: the study is under way
Key requirements
Who can take part, as listed by the sponsor. Only the study team can confirm whether you are eligible, so take this list to your doctor.
- Ages 18 to 35 years
- All sexes
- Healthy volunteers accepted
- Adult
Study population: Normal subjects and subjects with femoroacetabular impingement.
Who may be able to join
- Patients who present with hip pain subsequently diagnosed as femoroacetabular impingement
- Subjects who meet the following radiographic criterion of cam or pincer FAI, will be given the opportunity to volunteer in this study.
- Subjects that demonstrate a cross-over-sign or a lateral center edge angle (LCEA) without an alpha angle, will be classified as having pincer FAI.
- Subjects with an alpha angle, without a cross-over sign or LCEA, will be categorized as having cam type FAI.
- Finally, with at least one cam (alpha angle) and pincer sign "cross-over-sign or a lateral center edge angle (LCEA)" will be classified as mixed FAI.
- Control Population Inclusion Criteria:
- 12 controls will consist of volunteers in the same age range as the subject groups (18-35 years).
- Control hips will be screened with a standard AP radiograph. Normal volunteers who have radiographic evidence of FAI, dysplasia or other joint deformities will be excluded.
Who cannot join
- Subjects who have radiographic evidence of osteoarthritis (Tonnis Grade III or IV) will be excluded as this study focuses on the mechanics of hips before prominent cartilage damage.
- Subjects who have had prior procedures to correct FAI or other hip conditions will be excluded (exploratory procedures will be included).
- Minors (under age 18), mentally disabled, persons incarcerated, on parole, probation awaiting trial, or pregnant women are excluded from this study.
- A human Chorionic Gondaotropin (hCG) urine pregnancy test will be performed on all women prior to the study.
- To limit the annual radiation exposure to any participating volunteers, we will exclude anyone who has had a CT scan or participated in a research study involving ionizing radiation in the past 12 months.
- Motion Capture Exclusion Criteria:
Show all 11Show fewer
- Subjects who are unwilling or unable to perform the proposed activities of daily living or undergo the clinical exams will be dismissed.
- Subjects with a BMI less than 30 (www.nhlbisupport.com/bmi/) or those with dense hip musculature/wide hips (maximum of 42 cm of circumferential hip length) will be excluded.
- CT Exclusion Criteria:
- Subjects who are unwilling or unable to remain still.
- Subjects who are allergic to contrast agent and/or lidocaine will be dismissed.
Trial locations and contacts
1 site in 1 country. Contact the study team or a site near you to ask about taking part.
United States1 site
University of Utah Orthopaedic Center
Salt Lake City, Utah, 84108
About this study
The purpose of this study is to determine the influence of FAI abnormalities on hip joint biomechanics.
Read the detailed description
The purpose of this study is to quantify hip biomechanics of subjects with and without FAI.
The results of this study will advance our understanding of how the FAI alters the biomechanics of the hip joint, improving diagnosis and directing treatment strategies.
- Conditions
- Femoro Acetabular Impingement
- Medical subject headings
- Femoracetabular Impingement
What is being measured
The primary outcome is the main question the study is designed to answer.
Data Collection
We will calculate hip joint kinematics. Statistical analysis of the results will allow comparisons between normal and FAI subjects.
Measured: Follow-up Visit
Timeline
From the start of the study to its completion; the mark is today. Estimated dates are the sponsor’s plan.
- First posted12 Apr 2012 (estimated)
- Study startJan 2012
- Primary completionDec 2028 (estimated)
- Study completionDec 2028 (estimated)
Resources
- Official record on ClinicalTrials.govThe registry entry this page is built from, with its full change history.
- Other trials for Femoro Acetabular ImpingementStudies of the same condition, open and under way.
- More trials run by University of UtahThe sponsor's other registered studies.
- What the trial phases meanHow a treatment moves from first tests in people to approval.
More details
For doctors and researchers: how the study is designed, who runs it, and its registry IDs.
Study design
- Study type
- Observational
- Observational model
- Case-control
- Time perspective
- Prospective
- Enrolment
- 36 participants (estimated)
Sponsor and investigators
- Lead sponsor
- University of Utah
- Sponsor type
- University, hospital or other
- Responsible party
- Principal investigator, Andrew Anderson, University of Utah
- Investigators
- Andrew Anderson, Principal investigator, Orthopedic Surgery Operations
IDs, dates and publications
- ClinicalTrials.gov ID
- NCT01575964
- Sponsor's protocol ID
- 51053
- Acronym
- FAI
- Status last verified
- Aug 2026
- First submitted
- 6 Mar 2012
- Last updated
- 13 Aug 2026
- Results posted
- No
- Data monitoring committee
- No
- FDA-regulated drug
- No
- FDA-regulated device
- No
Study at a glance
From the registry record, last updated by the sponsor on 13 Aug 2026. Recruitment status is as the sponsor reported it: confirm with the study team.
- Official title
- Biomechanical Assessment of Femoroacetabular Impingement
- ClinicalTrials.gov ID
- NCT01575964
- Acronym / sponsor ID
- FAI / 51053
- Conditions
- Femoro Acetabular Impingement
- Study type
- Observational
- Recruitment status
- Enrolling by invitation
- Enrolment
- 36 participants (estimated)
- Lead sponsor
- University of UtahUniversity, hospital or other
- Study start
- Jan 2012
- Primary completion
- Dec 2028 (estimated)
- Study completion
- Dec 2028 (estimated)
- First posted
- 12 Apr 2012 (estimated)
- Results
- Not posted in the source record
Clinical summary
The research question as the sponsor registered it. This describes what the study plans to test, not what it found.
The purpose of this study is to determine the influence of FAI abnormalities on hip joint biomechanics.
Detailed description
The purpose of this study is to quantify hip biomechanics of subjects with and without FAI.
The results of this study will advance our understanding of how the FAI alters the biomechanics of the hip joint, improving diagnosis and directing treatment strategies.
Study design
- Observational model
- Case-control
- Time perspective
- Prospective
Who may qualify
- Ages
- 18 to 35 years
- Sex
- All
- Healthy volunteers
- Accepted
- Age groups
- Adult
- Study population
- Normal subjects and subjects with femoroacetabular impingement.
Key inclusion criteria (8 listed)
- Patients who present with hip pain subsequently diagnosed as femoroacetabular impingement
- Subjects who meet the following radiographic criterion of cam or pincer FAI, will be given the opportunity to volunteer in this study.
- Subjects that demonstrate a cross-over-sign or a lateral center edge angle (LCEA) without an alpha angle, will be classified as having pincer FAI.
- Subjects with an alpha angle, without a cross-over sign or LCEA, will be categorized as having cam type FAI.
- Finally, with at least one cam (alpha angle) and pincer sign "cross-over-sign or a lateral center edge angle (LCEA)" will be classified as mixed FAI.
Key exclusion criteria (11 listed)
- Subjects who have radiographic evidence of osteoarthritis (Tonnis Grade III or IV) will be excluded as this study focuses on the mechanics of hips before prominent cartilage damage.
- Subjects who have had prior procedures to correct FAI or other hip conditions will be excluded (exploratory procedures will be included).
- Minors (under age 18), mentally disabled, persons incarcerated, on parole, probation awaiting trial, or pregnant women are excluded from this study.
- A human Chorionic Gondaotropin (hCG) urine pregnancy test will be performed on all women prior to the study.
- To limit the annual radiation exposure to any participating volunteers, we will exclude anyone who has had a CT scan or participated in a research study involving ionizing radiation in the past 12 months.
Eligibility is decided by the study team after screening; this overview does not establish that a patient qualifies. Full inclusion and exclusion criteria.
Primary outcome
Data Collection
Time frame: Follow-up Visit
We will calculate hip joint kinematics. Statistical analysis of the results will allow comparisons between normal and FAI subjects.
Results and safety
This study is still under way. Results are not available in the source record yet.
Research links
- Official record on ClinicalTrials.govLast updated by the sponsor 13 Aug 2026.
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Referral and contact
AzTrials does not enrol participants or take referrals. Contact the study team or a site listed below; they decide who can take part.
Andrew Anderson principal investigator
Orthopedic Surgery Operations
1 site in 1 country: see every site and its status.
Questions about this trial
What is this clinical trial studying?
An observational study of Femoro Acetabular Impingement, run by University of Utah at 1 site in United States.
The full registered description is in the About this study section and the official record.
Who may be eligible to take part?
The sponsor lists 8 inclusion and 11 exclusion criteria. Eligibility is decided by the study team after screening, so read the full criteria and contact a listed site.
Is this clinical trial currently recruiting?
The record says: enrolling by invitation, as of the sponsor's last update on 13 Aug 2026. Status can change between updates, so confirm with the study contact before making plans.
Where is the study taking place?
The record lists 1 site in United States. Whether a site is taking part right now should be confirmed with that site. See every site.
What are the possible benefits and risks?
They depend on the study and the treatment, and no study can promise a benefit. The study team explains the known risks during informed consent, before anyone joins; the record itself does not list them.
Are results available for this study?
This study is still under way. Results are not available in the source record yet.
How can a doctor refer a patient or contact the research team?
The record lists no contact. The official record names the sponsor, who can be asked directly. AzTrials does not enrol participants or take referrals.
What does the primary outcome measure?
Data Collection (time frame: Follow-up Visit). It is what the study was designed to measure, not a finding.
Where can I read the original study information?
Does a listing mean the treatment is approved or proven to work?
No. A listing means the study is registered. It does not show that the treatment is safe, works, or is approved by a regulator.
How often is this information updated?
AzTrials copies changed records from ClinicalTrials.gov every night and reloads the whole registry every week. The sponsor last updated this record on 13 Aug 2026.