Varus Stem Positioning of a Cementless Anatomical THA. (VARABG)

Centre Hospitalier Universitaire de Nīmes

Status: Completed

Conditions: Osteoarthritis; Arthroplasty Complications

Treatments: Diagnostic Test: Xray

Study type: Observational

Funder types: Other

Identifiers

NCT04653090

20.0035

Details and patient eligibility

About

Varus positioning is the most common femoral malposition in total hip arthroplasty (THA). The aim of this study was to compare the long-term results of an anatomical cementless femoral stem positioned in varus with those in neutral alignment.

Full description

Data were prospectively collected and retrospectively reviewed for all patients who received a cementless anatomical femoral stem in THA between 1998 and 2008. After exclusion criteria applied, 127 stems had an varus axis deviated by more than 3 degrees (varus group) and 156 had an alignment between 0 and 2.9° from the femoral axis (neutral group). Survivorship rates, complications, clinical scores, thigh pain, radiological score, cortical hypertrophy and filling rate were analyzed. Mean follow-up was 10 years.

Enrollment: 283 patients

Sex: All

Ages: 18+ years old

Volunteers: No Healthy Volunteers

Inclusion criteria

• All patients received by several senior surgeons, the same standardized posterolateral total hip arthroplasty, and the same rehabilitation protocol.

Exclusion criteria

• Etiologies other than osteoarthritis (osteonecrosis, fracture, dysplasia, rheumatoïd arthritis),
• Complex cases with additional procedure,
• Dual-taper modular or cemented stem,
• Incomplete preoperative data or less than one-year postoperative data.

Trial design

283 participants in 2 patient groups

Varus group

Description:

Radiographic stem axis was assessed on standard anteroposterior hip radiographs performed at the 3-month follow-up visit. Alignment was evaluated as described by Reina et al., by the angular deviation of the anatomic femoral axis and the stem axis. The 3 degrees minimal-value was considered to be the threshold defining a varus stem.

Treatment:

Diagnostic Test: Xray

Neutral group

Description:

Alignment between anatomic femoral axis ans stem axis was less than 3°.

Treatment:

Diagnostic Test: Xray