An observational study in Femoro-acetabular Impingement (FAI), sponsored by Assiut University. Not yet recruiting at 1 site in Egypt. Open to participants aged 18 Years to 55 Years. Per ClinicalTrials.gov, last updated 2026-10-22.
Sponsored by Assiut University · Observational
The goal of this observational study is to document clinical outcomes after primary hip arthroscopy in patients with femoroacetabular impingement, describe the pathology zone distribution and detect whether the pathology site impact the outcomes. The main questions it aims to answer are:
Participants will
Femoroacetabular impingement (FAI) - abnormal contact between the proximal femur and acetabular rim during hip motion - is an established cause of hip pain and early osteoarthritis in active adults. FAI classically presents with anterior groin pain, found in 81% of patients in a large arthroscopic series. In these patients, cam or pincer morphology produces chondrolabral injury predominantly at the anterosuperior acetabular rim, between the 12 and 3 o'clock positions. Posterior hip or buttock pain, however, occurs in up to 20% of patients with early intra-articular hip disease, and atypical pain locations account for 29.6% of consecutive FAI patients undergoing arthroscopy.
Posterolateral FAI may result from a cam deformity at the 9-11 o'clock arc of the femoral head-neck junction, from posterior acetabular overcoverage due to a prominent posterior wall, or from abnormal femoral version shifting the impingement zone posteriorly - each producing posterior chondrolabral injury distinct from the anterosuperior pattern of classical anterior cam FAI.
The evidence base for posterolateral FAI as a defined entity remains sparse. Previous cohorts were retrospective and used pain location as their sole stratification criterion, without intraoperative mapping of the pathological zone. No prospective cohort has systematically documented the intraoperative clock-face distribution of chondrolabral pathology in consecutive FAI patients or compared morphological and patient-reported outcomes across pathology-zone groups.
This study aims to document the clinical course of consecutive FAI patients undergoing hip arthroscopy, describe intraoperative distribution of chondrolabral pathology of the cohort by clock-face position with its respective clinical features; to identify the preoperative morphological correlates of each pathology-zone group; and to compare outcomes at 12 months between groups as pre-specified exploratory secondary analyses.
109 studies on the registry are indexed under Femoracetabular Impingement; 36 are open to participants now.
This study's planned enrollment of 45 is below the median of 88 across 37 observational studies indexed under Femoracetabular Impingement.
Browse Femoracetabular Impingement studies →Assiut University is the lead sponsor of 5,050 studies on the registry; 2,174 are open to participants now.
Of its 14 completed or terminated interventional studies of FDA-regulated products, 0 (0%) have results posted.
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Patients meeting the eligibility criteria and undergoing elective primary hip arthroscopy for FAI at the Arthroscopy and Sports Injury Unit, Department of Orthopaedic Surgery and Traumatology, Assiut University Hospital, Egypt.
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Exclusion Criteria:
Change in iHOT-12 from baseline to 12 months for the whole cohort
Participants will complete a questionnaire for the iHOT-12
Time frame: measured prior to and 12 months after surgery
Frequency distribution of chondrolabral pathology by clock-face position; proportion of patients in each zone group (A, B, C)
Intraoperative Assessment will be done via a structured assessment form and the distribution of chondrolabral pathology by clock-face positionfor each patient is documented. Then each patient is classified intraoperatively as: Group A (anterior/anterolateral pathology, 12 to 3 o'clock arc), Group B (mixed anterior and posterolateral pathology), or Group C (isolated posterolateral pathology, 9 to 11 o'clock arc).
Time frame: Done at hip arthroscopy surgery
VAS score change
VAS score for pain to be filled by the patient
Time frame: prior to and at 12 months after surgery
Change in EQ-5D-5L from baseline to 12 months
EQ-5D-5L questionnaire to be filled by the patient
Time frame: prior to and at 12 months after surgery
Tönnis grade
AP pelvis and lateral hip radiographs are obtained and assessed for differents variables as: Tönnis grade.
Time frame: prior to hip arthroscopy
LCEA
AP pelvis and lateral hip radiographs are obtained and assessed for differents variables as: Lateral Centre Edge Angle
Time frame: prior to hip arthroscopy
PWI
AP pelvis and lateral hip radiographs are obtained and assessed for differents variables as: Posterior Wall Index
Time frame: prior to hip arthroscopy
Alpha angle
AP pelvis and lateral hip radiographs are obtained and assessed for differents variables as: Alpha angle
Time frame: prior to hip arthroscopy
HNOR
AP pelvis and lateral hip radiographs are obtained and assessed for differents variables as: Head Neck Offset Ratio.
Time frame: prior to hip arthroscopy
Acetabular version
Assessed via rotational profile images
Time frame: prior to hip arthroscopy
Between-group comparisons of iHOT-12(Groups A vs B; Group C: descriptive only if n ≤5)
The score will be statistically compared across the pathology-zone groups. Group A and Group B will be tested against each other. Group C - the isolated posterolateral group - if it ends up with ≤5 patients, no test is run on it.
Time frame: prior to and at 12 months after surgery
Between-group comparisons of VAS pain (Groups A vs B; Group C: descriptive only if n ≤5)
The score will be statistically compared across the pathology-zone groups. Group A and Group B will be tested against each other. Group C - the isolated posterolateral group - if it ends up with ≤5 patients, no test is run on it.
Time frame: prior to and at 12 months after surgery
Between-group comparisons of EQ-5D-5L (Groups A vs B; Group C: descriptive only if n ≤5)
The score will be statistically compared across the pathology-zone groups. Group A and Group B will be tested against each other. Group C - the isolated posterolateral group - if it ends up with ≤5 patients, no test is run on it.
Time frame: prior to and at 12 months after surgery
Between-group comparisons of PWI (Groups A vs B; Group C: descriptive only if n ≤5)
PWI will be statistically compared across the pathology-zone groups. Group A and Group B will be tested against each other. Group C - the isolated posterolateral group - if it ends up with ≤5 patients, no test is run on it.
Time frame: Images obtained at enrollment, patients classified at arthroscopy then compared
Between-group comparisons of LCEA (Groups A vs B; Group C: descriptive only if n ≤5)
LCEA will be statistically compared across the pathology-zone groups. Group A and Group B will be tested against each other. Group C - the isolated posterolateral group - if it ends up with ≤5 patients, no test is run on it.
Time frame: Images obtained at enrollment, patients classified at arthroscopy then compared
Between-group comparisons of Alpha angle (Groups A vs B; Group C: descriptive only if n ≤5)
Alpha angle will be statistically compared across the pathology-zone groups. Group A and Group B will be tested against each other. Group C - the isolated posterolateral group - if it ends up with ≤5 patients, no test is run on it.
Time frame: Images obtained at enrollment, patients classified at arthroscopy then compared
Between-group comparisons of HNOR (Groups A vs B; Group C: descriptive only if n ≤5)
HNOR will be statistically compared across the pathology-zone groups. Group A and Group B will be tested against each other. Group C - the isolated posterolateral group - if it ends up with ≤5 patients, no test is run on it.
Time frame: Images obtained at enrollment, patients classified at arthroscopy then compared
Between-group comparisons of acetabular version (Groups A vs B; Group C: descriptive only if n ≤5)
Acetabular version will be statistically compared across the pathology-zone groups. Group A and Group B will be tested against each other. Group C - the isolated posterolateral group - if it ends up with ≤5 patients, no test is run on it.
Time frame: Images obtained at enrollment, patients classified at arthroscopy then compared
Plan to share: Undecided
From the registry record's own update history. This site started tracking changes on Sep 25, 2026; for anything earlier, see the record history on ClinicalTrials.gov ↗
This study is not yet recruiting, as verified in Sep 2026. You cannot join it, but the record below documents what was studied.
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