Long-term Outcomes of Conical Tapered Stems in Cementless Total Hip Arthroplasty Due to Congenital Hip Pathologies

Study Overview
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Brief Summary
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A retrospective consecutive population of patients treated with conical tapered stems in cementless total hip arthroplasty for osteoarthritis due to congenital hip pathologies will be selected. The aim of this retrospective study is to evaluate the long-term clinical and radiographic results of this implant and the survival rates in such a specific cohort.

Detailed Description
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Congenital hip pathologies may severely alter the local anatomy of the hip, making total hip arthroplasty (THA) due to osteoarthritis after congenital hip pathologies challenging. While it seems that congenital hip pathologies did not significantly influence the outcomes when compared to THA after osteoarthritis, the choice of implant was demonstrated to impact the survival rates of the THA after congenital hip pathologies. To date, no guidelines exist about the correct choice of hip implant in congenital hip pathologies: only mid-term case series are available. Conical tapered stems have been frequently suggested for the most difficult cases. The aim of this study is to describe the survival rates and the long-term clinical and radiological outcome of conical tapered stems in THAs after congenital hip pathologies.

Official Title
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Retrospective Study About the Long-term Outcomes of Conical Tapered Stems in Cementless Total Hip Arthroplasty for Osteoarthritis Due to Congenital Hip Pathologies

Conditions
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Dysplasia; Hip, Prosthesis Survival

Intervention / Treatment
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* Device: Conical tapered stem


Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: Symptomatic hip osteoarthritis due to congenital hip pathologies Consecutive population with a minimum follow-up of 2 years Cementless total hip arthroplasty with conical tapered stem Pre-operative planning using CT Complete clinical and radiographic assessment Exclusion Criteria: Other type of hip osteoarthritis Other type of implants Inadequate pre-operative planning (eg: no CT) Incomplete clinical and radiographic assessment

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 |
| --- | --- |
| Congenital hip pathologies<br>Conical tapered stem for osteoarthritis due to congenital hip pathologies | Device: Conical tapered stem<br>* Implantation of conical tapered stem<br>|

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Harris Hip Score | Mean clinical results at last follow-up evaluated using the Harris hip score. Minimum-maximum values: 0-100. Best result: 100. | 15 months | 
| Survival Rate | Percentage of survived implants (no component exchange or removed) described using Kaplan-Meier curve with 95% confidence interval. Minimum-maximum values: 0-100. Best result: 100. | 15 months | 
| Radiographic Cup Osseointegration | Osseointegrated cups described using the Moore's criteria: the cup is osseointegrated when at least 3 criteria are present (radial trabeculae, superolateral buttress, inferolateral buttress, medial stress shielding, absence of radiolucent lines). | 15 months | 
| Radiographic Stem Osseointegration | Osseointegrated stems described according to Engh's criteria | 15 months |