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.

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.