Collarless Actis hip stem for cementless hip replacement in Asian patients

Is this trial a fit for you?

A plain-English reading of the study's rules. Only the study team can confirm whether you qualify.

What this trial studies

This prospective cohort examines the collarless Actis cementless femoral stem used in total hip arthroplasty with ceramic-on-ceramic bearings. All surgeries use a standardized posterior approach and a coordinated cup positioning strategy to optimize fixation and load distribution. Outcomes will track safety and function over five years, with emphasis on bone remodeling and potential stress shielding. The study targets adults undergoing primary hip replacement for arthritis, avascular necrosis, dysplasia, rheumatoid disease, or prior fractures, and excludes those receiving non-Actis stems or cemented components. Data will come from a single East Asian population at a leading Korean center with international collaboration from Johnson & Johnson Medical Korea.

Why it matters

Who can join: the full rules

Inclusion Criteria:

* Age 18 years or older
* Scheduled to undergo primary total hip arthroplasty for one of the following: osteoarthritis of the hip, developmental dysplasia of the hip, rheumatoid arthritis, non-rheumatoid inflammatory arthritis, post-traumatic arthritis, osteonecrosis of the femoral head, or displaced femoral neck fracture
* Willing and able to provide written informed consent

Exclusion Criteria:

* Age under 18 years
* Total hip arthroplasty performed with a femoral stem other than the collarless Actis stem
* Severe medical comorbidity precluding participation
* Unwilling to participate in the study

Where it's running

• Seoul National University Bundang Hospital
  Seongnam-si, Gyeonggi-do, South Korea Recruiting

Study contacts

• Principal investigator: Young-Kyun Lee, MD — Seoul National University Bundang Hospital
• Study coordinator: Jung-Wee Park, MD
• Email: jwepark@snubh.org
• Phone: 82-31-787-7215

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How to take part

1. Review the eligibility criteria above with your treating physician.
2. Check the official listing on ClinicalTrials.gov for the latest contact details and recruitment status.
3. Contact the study coordinator or principal investigator to ask for pre-screening. Pre-screening is free and never obligates you to enroll.