Marker for FAI Diagnosis

Study Overview
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Brief Summary
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The diagnostic gold standard to differentiate FAI (femural acetabular impingement) from other muscular-tendinous pathologies is, actually, the injection of intra-articular anesthetic (lidocaine), with a pre- and post- evaluation of pain scale. If, after injection, the pain disappears, the pain is probably due to an articular problem (FAI). This kind of differential diagnosis test has a sensibility of 100% and a specificity of 81%. C-terminal telopeptide of type II collagen (CTXII) as cartilage degradation index, could be a marker, simply detectable, to assess the healthy of the cartilage status and could be measured in serum and urine.

Detailed Description
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This study is observational-analytical and cross-sectional, because the same patient will receive both the diagnostic iter. For the rules of Evidence-based Medicine (Brown et al., 2006), the definition of this study PICO is: P (population)= all the patients with suspected FAI afferent to Orthopaedic-Traumatology and Prosthetic surgery and revisions of hip and knee implants I (intervention)= enzyme-linked immunosorbent assay (ELISA) for C-terminal telopeptide of type II collagen (CTXII) in serum and urine C (comparison)= intra-articular lidocaine injection O (outcome)= sensibility/specificity of ELISA test From a literature analysis the C-terminal telopeptide of type II collagen (CTXII) seem to be the best candidate for this kind of comparison. Some previous studies (Scarpellini et al, 2008) demonstrated that this marker could be used in this way, and, for this reason, the aim of this study is to investigate the sensibility and specificity of this marker in serum and urine, vs the actual diagnostic gold standard (anesthetic intra-articular injection). If the marker will be equal or better than the actual gold standard, the clinical practice will have an improvement, because this kind of analysis is simply performing and less invasive for the patient. The study will enroll 20 patients with suspected FAI between 18-45 years and of both the gender.

Official Title
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Use of a Marker for Cartilage Damage to Differentiate the Diagnosis of Femural Acetabular Impingement From Extraarticular Pathologies.

Conditions
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Femoroacetabular Impingement

Intervention / Treatment
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* Drug: Local anesthetic


Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: Patients with clinical diagnosis of suspected FAI Patients with clinical addressing to arthroscopy Exclusion Criteria: Patients referring articular rheumatic pathologies Patients referring traumatic events in hip Patients wearing other hip prosthesis

Ages Eligible for Study
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Minimum Age: 18 Years
Maximum Age: 45 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

| Intervention/Treatment |
| --- |
|Drug: Local anesthetic|local injection|

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Number of partecipants with positive FAI by diagnostic gold standard (anesthetic injection) and negative response of FAI by dosing markers. | It will be valuated with ROCC curve of both the diagnostic protocols. The Diagnostic Gold standard (anesthetic injection) ascertains the presence of FAI when, after anesthetic injection, the measured pain considerably decreases or disappears, using tha VAS scale for pain. If the dosage of the markers will be higher of the assessed normal values in the cases of diagnosed FAI, with a higher or equal sensitivity and specificity (%), it will be demonstrated that this kind of diagnosis could be a good subtituite of the actual diagnostic gold standard (valuated with ROCC curve) | 1 year |