Kinematic alignment versus conventional techniques for total hip arthroplasty: A retrospective case control study.

Area of Science:

• Orthopedic Surgery
• Biomechanical Engineering
• Radiographic Analysis

Background:

• Conventional total hip arthroplasty (THA) complications persist despite improved techniques.
• Radiographic cup orientation poorly predicts THA outcomes.
• Lumbo-pelvic kinematics may influence functional acetabular orientation and clinical results.

Purpose of the Study:

• To assess the early-term safety and efficacy of the Lumbo-Pelvic kinematic alignment (KA) technique for THA.
• To compare the KA technique with the conventional mechanical alignment (MA) technique in restoring native hip anatomy, radiographic cup position, and clinical outcomes.

Main Methods:

• A case-control retrospective study with prospectively collected data.
• Forty-one consecutive KA-THAs were paired with 41 MA-THAs.
• Comparison of 1-year clinical outcomes and radiographical measurements between the two groups.

Main Results:

• The KA technique achieved a more anatomical restoration of the hip centre of rotation compared to MA.
• KA demonstrated a higher cup anteversion and a similar cup inclination and proportion of cups within the Lewinnek zone.
• Both techniques showed similar excellent functional outcomes, patient satisfaction, and absence of aseptic complications at 1 year.

Conclusions:

• The KA technique for THA is safe, efficacious, and not inferior to the conventional MA technique in the early term.
• Further research is needed to determine the mid- to long-term clinical influence of the KA technique.
• Refinements to the KA concept are ongoing.