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Comparing Collared and Collarless Femoral Stems in Primary Total Hip Arthroplasty

Comparing Collared and Collarless Femoral Stems in Total Hip Arthroplasty

Who can join

Ages 18 to 99 · All sexes

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.

About the study

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.

What is being tested

• Collarless Femoral Stem (other)
• Collared Femoral Stem (other)

Sponsor: Medstar Health Research Institute · Participants: 100 · Started: Dec 3, 2025

Contact the study team

• Miles Hollimon, B.S. · Phone: (202) 444-8766

Official record on ClinicalTrials.gov — NCT07337642

Locations in the U.S.

From ClinicalTrials.gov, data retrieved Oct 2, 2026. Each study sets its own eligibility; the study team decides who can join.