Comparative Outcomes of Dual Mobility Cup versus Bipolar Hemiarthroplasty in Patients with Neurological Disorder with Femoral Neck Fractures

• Published in: Hip & pelvis Vol. 37; no. 3; pp. 213 - 222
• Main Authors: Hong, Seok Ha, Han, Seung Beom
• Format: Journal Article
• Language: English
• Published: Korea (South) 대한고관절학회 01.09.2025
• Subjects: 정형외과학; Neurological disorder; Femoral neck fractures; Hip arthroplasty
• ISSN: 2287-3260; 2287-3279
• DOI: 10.5371/hp.2025.37.3.213

To compare the risk of periprosthetic and medical complications following dual mobility cup total hip arthroplasty (DMC-THA) and bipolar hemiarthroplasty (BHA) for femoral neck fractures in patients with neurological disorders. This retrospective study included patients with neurological disorders who underwent DMC-THA (n=1,153) or BHA (n=4,612) between 2016 and 2022, identified from the Korean Health Insurance Review and Assessment Service database. Propensity score matching was performed at a 1:4 ratio to adjust for baseline characteristics. The primary outcome was periprosthetic complications; the secondary outcome was medical complications. Compared with the BHA-matched group, the DMC-THA group showed a higher rate of early periprosthetic fracture (2.6% vs. 1.4%, =0.02) and late dislocation (1.1% vs. 0.5%, =0.03). No significant differences were observed in periprosthetic joint infection or revision. Regarding medical complications, DMC-THA was associated with more transfusions (63.1% vs. 57.6%, <0.001) but fewer urinary tract infections (3.4% vs. 5.1%, =0.01). Multivariable analysis identified DMC-THA as an independent risk factor for early periprosthetic fracture (odds ratio [OR] 3.01, 95% confidence interval [CI] 1.39-6.80, =0.004) and late dislocation (OR 2.53, 95% CI 1.18-5.42, =0.02). DMC-THA was not superior to BHA in preventing dislocation and was associated with a higher risk of periprosthetic fracture and late dislocation in neurologically impaired patients. Surgeons should recognize the risks of using DMC-THA implants as a sole strategy to prevent instability in this high-risk population.