Dual Mobility Cup Versus Unipolar Cup

Dislocation, Hip Clinical Trial

Official title: Risk of Dislocation After Total Hip Replacement: Dual Mobility Cup vs. Unipolar Cup. A Randomized Controlled Trial With Patients ≥65 Years Operated for Hip Osteoarthritis With Primary Total Hip Replacement (THR).

Status Not yet recruiting

Clinical Trial Summary

The general purpose of this study is to examine whether the dual mobility cup (Novae® Serf) reduces the number of hip dislocations after total hip replacement, both early dislocation (≤1 year) and late dislocation (>1 year) after primary THR compared with a conventional cup design (Trabecular MetalTM Modular Acetabular System).

Clinical Trial Description

Surgery with THR for arthritis and other hip disorders has long been one of the most successful orthopedic surgical treatments. The majority of the patients gain pain relief and experience improved hip function. In 2017, a total of 10,691 THRs were implanted in Denmark (annual report 2018). Hip dislocation is a known complication after THR. It is a painful condition which may have far-reaching consequences for the patient, who may experience both physical and mental discomfort. Ultimately, multiple hip dislocations may result in reoperation. In the literature, the incidence of hip dislocation is reported at 2-6 %, and a more recent review reports a risk of 0.5-10 %. In Denmark, recurrent hip dislocation is the cause of 21 % of the reoperations per year according to The Danish Hip Arthroplasty Register. According to the British National Joint Registry (NJR) and the Australian register (AOANJRR), hip dislocation is the cause of 15.5 % and 21 %, respectively, of the reoperations. The best method to avoid reoperation due to instability is to choose the correct implant for the individual patient and thereby spare the patient of having to endure a painful complication and yet another procedure. There are multiple risk factors for instability after THR, and increased use of dual mobility cups (DMC) is already documented. ;

Related Conditions & MeSH terms

• Dislocation, Hip
• Hip Dislocation

• NCT number: NCT04685239
• Study type: Interventional
• Source: Northern Orthopaedic Division, Denmark
• Contact: Anders Diernæs, MD
• Phone: +4597662503
• Email: anders.diernaes@rn.dk
• Status: Not yet recruiting
• Phase: N/A
• Start date: April 1, 2023
• Completion date: December 2035