Retrospective Study on Radiological Factors Predictive of Psoas Impingement

Study Overview
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Brief Summary
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The purpose of this study is to identify radiological factors on TC of the hip that could lead to prediction of development of symptomatic psoas impingement in patients with protruding acetabular cup after primary total hip arthroplasty.

Official Title
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Retrospective Study on Radiological Factors Predictive of Symptomatic Psoas Impingement Development in Protruding Cups in Primary Hip Arthroplasty

Conditions
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Hip Impingement Syndrome, Prosthetic Complication

Intervention / Treatment
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* Diagnostic Test: Pelvis CT scan


Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: Primary total hip arthroplasty Execution of a postoperative Ct scan for pain, noises or planning of the contralateral THA 5 years minimum follow-up for the control group, tenotomy of the iliopsoas muscle in the cases group Complete clinical and radiological data Exclusion Criteria: Patient's refusal to participate Non adequate Ct scans or made for periprosthetic fractures, component mobilization, periprosthetic infection or wearing of the prosthesis Incomplete clinical and radiological data Inadequate follow-up or regression of the iliopsoas impingement symptoms with non-operative treatment

Ages Eligible for Study
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Minimum Age: 18 Years

Sexes Eligible for Study
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All

Accepts Healthy Volunteers
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No

Study Plan
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How is the study designed?
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Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| Cases<br>Patients that have symptomatic psoas impingement in a protruding acetabular cup documented by a Pelvis CT scan | Diagnostic Test: Pelvis CT scan<br>* Post-THA hip pelvis CT scan execution for pain, noise or THA planning for the controlateral hip, with identification of acetabular cup protrusion. Comparation of cases and controls to identify radiological factors that could potentially lead to symptomatic psoas impingement prediction.<br>|
| Controls<br>Asymptomatic patients with a protruding acetabular cup documented by a Pelvis CT scan | Diagnostic Test: Pelvis CT scan<br>* Post-THA hip pelvis CT scan execution for pain, noise or THA planning for the controlateral hip, with identification of acetabular cup protrusion. Comparation of cases and controls to identify radiological factors that could potentially lead to symptomatic psoas impingement prediction.<br>|

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Acetabular cup antiversion | The angle between the tangent to the cup opening and the tangent to the posterior ischial spines in the axial plane | 0 | 
| Acetabular cup inclination | The angle between the tangent to the cup opening and the interteardrop line in the frontal plane | at baseline (day 0) | 
| Femoral offset | The distance between the center of rotation and the femoral axis in the frontal plane | at baseline (day 0) | 
| Acetabular offset | The distance between the center of rotation and the Kohler line in the frontal plane | at baseline (day 0) | 
| Eccentric Reaming | The distance between the native hip center of rotation and the acetabular cup center of rotation in the axial plane | at baseline (day 0) | 

 Terms related to the study
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Keywords Provided by Centre Hospitalier Valida
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Iliopsoas Impingement, Overhanging Cup