Retrospective Observational Cohort Study of SYMBOL CUP DM 1

Etude de Cohorte Observationnelle Rétrospective SYMBOL CUP 1

This is a single-center retrospective observational cohort study of consecutively operated patients who underwent primary total hip arthroplasty with a SYMBOL CUP DM HA hemispherical dual mobility acetabular implant. The purpose of this study is to estimate the safety and efficacy of that implant at two-year follow-up.

Description according to PICOS framework:

Patients:

- Adult men and women requiring a primary total hip arthroplasty

Intervention:

- Primary THA with SYMBOL CUP DM HA hemispherical dual mobility acetabular implant.

Comparator: None

Outcomes:

• Safety 1: Implant survival over 2-year follow-up.
• Safety 2: All adverse events, with focus on implant dislocation, infections, revision surgery
• Efficacy 1: Harris Hip Score (HHS) at baseline and 1-year follow-up.
• Efficacy 2: Modified HHS consisting of pain + functional subscores at baseline, 1-year and 2-year follow-ups.
• Efficacy 2: Devane score at baseline, 1-year and 2-year follow-ups.
• Efficacy 3: Charnley classification at baseline, 1-year and 2-year follow-ups.

Study design:

• single-center retrospective observational cohort study of consecutively operated patients who underwent primary total hip arthroplasty 2 years prior to study start.
• Prospective 2-year follow-up letter and phone questionnaire.

Inclusion Criteria:

• All patients with total hip implant using hemispheric dual-mobility SYMBOL CUP DM HA
• Operation performed by the primary investigator
• Delay between index operation and March 1 2018 has reached 2 years

Exclusion Criteria:

• patient refusal to participate in the study
• minors (age < 18 years)
• patients under guardianship