The effect of femoral head size on dislocation following total hip replacement

The effect of a large 36 mm vs standard 28 mm articulation in a total hip prosthesis on the incidence of dislocation one year following total hip replacement

Status

Active, not recruiting

Phases

Unknown

Study type

Interventional

Source

ANZCTR

Registry ID

ACTRN12609000678291

Enrollment

650

Registered

2009-08-10

Start date

2001-09-24

Completion date

2007-06-08

Last updated

2020-01-13

For informational purposes only — not medical advice. Sourced from public registries and may not reflect the latest updates. Terms

Conditions

None listed

Brief summary

This randomised controlled trial aims to determine whether a total hip replacement with a larger 36 mm diameter prosthetic femoral head significantly reduces the incidence of dislocation one year following total hip replacement, compared to total hip replacement with a standard 28 mm diameter prosthetic femoral head. The effect of the larger femoral head on both polyethylene wear and acetabular cup migration is also being assessed.

Interventions

Total hip replacement using a 36 mm metal on highly cross-linked polyethylene articulation. This is a surgical procedure where the femoral head is removed and replaced by a metal prosthetic femoral head (which in this situation has a diameter of 36 mm), which is attached to a femoral stem inserted into the femur. The head then articulates with a plastic (highly cross-linked polyethylene) liner in a metal acetabular shell, which is inserted into the acetabulum. The duration of the operation is be

Study design

Allocation

Randomised controlled trial

Primary purpose

Treatment

Eligibility

Sex/Gender

All

Age

50 Years to No maximum

Healthy volunteers

Inclusion criteria

undergoing primary total hip replacement involving a metal on polyethylene articulation, through a posterior surgical approach, for osteoarthritis, rheumatoid or other inflammatory arthritis, or previous fracture/dislocation/surgery to the hip; or undergoing revision total hip replacement (involving a metal on polyethylene articulation) of a hemiarthroplasty or revision of a total hip replacement

Exclusion criteria

age <60 years (revisions: <50), neuromuscular disease, abnormal abductor mechanism, abnormal acetabulum (primaries only), revision for instability or infection (revisions only)

Outcome results