Retrospective Observational Cohort Study of SYMBOL CUP DM 2

Etude de Cohorte Observationnelle Rétrospective SYMBOL CUP 2

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

Description according to PICOS (Patient, Intervention, Comparator, Outcomes, Study design) framework:

Patients:

- Adult men and women requiring a total hip arthroplasty

Intervention:

- THA with SYMBOL CUP DMR HA or SYMBOL CUP DM CEM hemispherical dual mobility acetabular implants.

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 (mHHS) 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 followups.

Study design:

• single-center retrospective observational cohort study of consecutively operated patients who underwent 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 DMR HA or SYMBOL CUP DM CEM
• 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