Skip to main content
OpenTrials
Recruiting

NCT Number: NCT07337642

Comparing Collared and Collarless Femoral Stems in Primary Total Hip Arthroplasty

This is a prospective randomized control trial comparing two collared and collarless femoral implants used in primary total hip arthroplasty. The specific aims of this trial are to:

SA1: Prospectively assess clinical outcomes in patients undergoing primary total hip arthroplasty with a collared versus collarless femoral stem of the same design.

SA2: Evaluate serial radiographs to quantify differences in subsidence between collared and collarless implant groups.

SA3: Report and compare incidence rates of intraoperative and postoperative periprosthetic fractures and aseptic loosening following primary total hip arthroplasty with use of either a collared or collarless stem.

Hypothesis: The addition of a collar to the same designed triple-taper primary hip stem will lead to a reduction in subsidence and incidence of perioperative and periprosthetic femur fractures.

Recruiting

Interested in participating?

Request Info

Key information

Conditions

Primary Total Hip Arthroplasty

Age range

18 year–99 year

Sex eligibility

All sexes

Study type

Interventional

Phase

Not applicable

Primary location

MedStar Georgetown University Hospital

Washington D.C., District of Columbia, 20007, United States

Location status: Recruiting

Location contact

Miles Hollimon, B.S.

CONTACT

[email protected]

(202) 444-8766

Who can participate

Healthy volunteers accepted: No

Only the study team can determine whether someone qualifies for participation.

Inclusion criteria

  • Adults (≥ 18 years old) scheduled for primary, uncemented THA using a cementless femoral stem
  • Diagnosis of primary osteoarthritis or other non-inflammatory degenerative joint disease.
  • Ability and willingness to comply with study procedures and follow-up schedule.
  • Ability to provide written informed consent

Exclusion criteria

  • Patients not indicated for a cementless THA
  • Prior surgery on the ipsilateral hip (e.g., prior THA, internal fixation, osteotomy)
  • Use of cemented or hybrid femoral components.
  • Revision THA or conversion THA
  • Active or prior infection of the hip joint.
  • Severe osteoporosis (T-score ≤ -2.5) or known metabolic bone disease.
  • Inability to complete follow-up or anticipated relocation out of the area.

Treatment and study plan

Collarless Femoral Stem

Other

Patients will be randomized to one of two groups receiving either a collarless or collared femoral stem. Patients randomized to this group will receive a collarless femoral stem implant at time of surgery.

Other names: Collarless

Collared Femoral Stem

Other

Patients will be randomized to one of two groups receiving either a collarless or collared femoral stem. Patients randomized to this group will receive a collared femoral stem at the time of surgery.

Other names: collared

Primary outcomes

  1. Measurement of femoral stem subsidence at 6 weeks, 6 months, and 1-year post-operation

    Time frame: 6 weeks, 6 months, and 1 year post operation

    Measurement of femoral stem subsidence at 6 weeks, 6 months, and 1-year post-operation used radiographic evidence.

Study contacts

Contact information is provided by the study sponsor or research team.

Miles Hollimon, B.S.

CONTACT

[email protected]

(202) 444-8766

Sponsors and collaborators

Lead sponsor

Medstar Health Research Institute

Other

Registry information

Official study title

Comparing Collared and Collarless Femoral Stems in Total Hip Arthroplasty

Important dates

Study start
2025
Primary completion
2026
Study completion
2027
First posted
Jan 13, 2026
Registry last updated
Jan 13, 2026

OpenTrials presents study information sourced from ClinicalTrials.gov. The official registry record should be consulted for the latest information.

View the official ClinicalTrials.gov record (opens in a new tab)

This listing is for discovery and informational purposes only. It is not medical advice, does not guarantee that a study is recruiting, and does not determine eligibility. Contact the study team and a qualified healthcare professional when considering participation.

Related clinical trials

Published trials that share one or more normalized conditions with this study.