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Enrolling by invitationNCT01575964FAIUpdated Aug 13, 2026

Biomechanical Assessment of Femoroacetabular Impingement

An observational study in Femoro Acetabular Impingement, sponsored by University of Utah. Enrolling by invitation at 1 site in United States. Open to participants aged 18 Years to 35 Years, including healthy volunteers. Per ClinicalTrials.gov, last updated 2026-08-13.

Sponsored by University of Utah · Observational

Study type
Observational
Model
Case-control
Time perspective
Prospective
Enrollment
36
Ages
18 Years to 35 Years
Sex
All
01

Study summary

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.

02

Conditions studied

  • Femoro Acetabular Impingement
03

In context

Femoracetabular Impingement

116 studies on the registry are indexed under Femoracetabular Impingement; 37 are open to participants now.

This study's planned enrollment of 36 is below the median of 88 across 37 observational studies indexed under Femoracetabular Impingement.

Browse Femoracetabular Impingement studies →

Lead sponsor

University of Utah is the lead sponsor of 994 studies on the registry; 175 are open to participants now.

Of its 114 completed or terminated interventional studies of FDA-regulated products, 69 (61%) have results posted.

Browse University of Utah studies →

Counted across the registry records on this site, refreshed daily.

04

Who can participate

Ages eligible
18 Years to 35 Years
Sexes eligible
All
Accepts healthy volunteers
Yes
Sampling method
Non-probability sample

Study population

Normal subjects and subjects with femoroacetabular impingement.

Go through the criteria one by one — yes, no or not sure — and take the list to your doctor or the study team. Kept in this browser only.

Inclusion criteria

  • 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.

Exclusion criteria

Exclusion Criteria:

  • 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:

  • 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 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.
Terms in these criteria, in plain language(1)

Underlined terms in the criteria open these too. Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.

BMI (body mass index)

Weight in kilograms divided by height in metres squared. Example: 70 kg and 1.75 m gives 70 ÷ (1.75 × 1.75) ≈ 22.9.

What counts as overweight or obesity differs between countries (some use lower cut-offs), so go by the range the study states.

05

Study design

Observational model
Case-control
Time perspective
Prospective
Enrollment
36 participants (estimated)
Patient registry
No
06

What researchers measure

Primary outcomes

  1. Data Collection

    We will calculate hip joint kinematics. Statistical analysis of the results will allow comparisons between normal and FAI subjects.

    Time frame: Follow-up Visit

07

Study locations

1 site
08

Updates

Tracking since Sep 25, 2026
No changes since tracking began. The registry record was last updated on Aug 13, 2026, before this site started recording changes on Sep 25, 2026. Its history is on ClinicalTrials.gov ↗
09

Registry details

Key details

Study ID
NCT01575964
Lead sponsor
University of Utah
Responsible party
Andrew Anderson (Associate Professor, University of Utah) — Principal investigator
First posted
Apr 12, 2012
Start date
Jan 2012
Primary completion
Dec 2028 (estimated)
Completion
Dec 2028 (estimated)
Last update
Aug 13, 2026

Study contacts

Andrew Anderson
principal investigator · Orthopedic Surgery Operations

Oversight

Data monitoring committee
No
FDA-regulated drug
No
FDA-regulated device
No
View the source record on ClinicalTrials.gov ↗

Interested in this study?

Eligibility is decided by the study team. Share this record with your doctor or contact the team directly.

No contact was published for this record. The registry link below has the sponsor’s details.

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Discussion

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