Abstract
Introduction
Hip Resurfacing has been shown to be a valuable treatment for younger osteoarthritis patients related to functional outcomes. On the other hand, there is a higher risk for potential neck fractures and there is serious concern over metal-ion release and related health risks associated with the current metal-on-metal designs. Neck-preserving, short-stem implants may be a good alternative for younger patients. The current study investigated patient-reported outcomes from resurfacing and total hip arthroplasty (THA) with a neck preserving, short-stem implant (Corin MiniHip®).
Methods
Hip disability and osteoarthritis outcome scores (HOOS) from a young group of patients (n= 52, age 48.9±6.1 years) who underwent hip resurfacing surgery and a cohort of patients who underwent MiniHip® THA surgery (n=73, age 48.2±6.6) were compared. MANCOVA analysis was conducted including follow-up period as covariate. To compare complexity of the surgical intervention, the average durations for both types of surgery were compared using non-parametric testing (Mann-Whitney's U).
Results
As expected, both surgical interventions were associated with significant improvements in HOOS scores (p<0.0001, h2=.69); however, there were no group effects or interactions related to any of the HOOS subscales. Surgery duration was significantly longer for Resurfacing (104.4min±17.8) than for MiniHip® surgery (62.5min±14.8), U=85.0, p<0.0001, h2=.56.
Conclusions
The current results indicate that the neck-preserving, short-stem approach via MiniHip Arthroplasty is equal to Resurfacing in terms of younger patients’ outcomes, while requiring shorter surgery duration. Additionally, there are serious concerns regarding the metal-on-metal designs of Resurfacing implants, which provides more support for the value of the presented short-stem alternative. Future research will aim at a longer-term (>5 years) evaluation of outcomes.
