Enovis Surgical’s hip portfolio is particularly rich, and in this case, quantity also means quality.
In this article, we highlight four key clinical studies that provide the long-term evidence supporting both the RM Pressfit vitamys cup and the optimys short stem.
The latest 10-year follow-up data on these implants offer strong, evidence-based reassurance for long-term use in primary THA:
- The RM Pressfit vitamys cup demonstrates excellent fixation and radiographic stability, with no aseptic loosening and a 98% survivorship at 10 years, confirming it as a safe choice for acetabular reconstruction.
- The optimys short stem shows durable fixation, low subsidence, and superior biomechanical restoration, with benefits in bone preservation and functional recovery — particularly well-suited for younger and active patients.
Together, these implants support a bone-preserving approach without compromising outcomes, delivering meaningful improvements in function and patient satisfaction.
Read on for further details and direct access to the clinical publications.
RM Pressfit vitamys: the 10-year follow-up
Haefeli et al, Hip International
Key results from the study:
- In a cohort of 99 hips, the cup demonstrated a remarkable 98% survivorship (any reason for revision) at 10 years
- No cases of aseptic loosening, and radiographs showed no signs of osteolysis or lucent lines — strong indicators of long-term implant integrity.
- Patients experienced significant improvements in function and satisfaction:
- Harris Hip Score (HHS) improved from 61 pre-op to 94.8 at 10 years
- VAS (satisfaction) increased from 38 to 95 over the same period
- Only two acetabular components and one femoral stem required revision, all due to malpositioning rather than implant failure.
Clinical takeaway:
A decade of follow-up data confirms the long-term success of the RM Pressfit vitamys cup.
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These results establish the RM Pressfit vitamys as a clinically safe and effective acetabular component for long-term performance.
Subsidence rate and long-term outcome of a calcar-guided short stem: a prospective 10-year follow-up study
Thut et al, Journal of Orthopaedic Surgery and Research
Key results from the study:
- Average stem subsidence over 10 years of 1.8 mm, stabilizing after the first 3 months
- Subsidence did not correlate with clinical outcomes
- Excellent functional results at 10 years: HHS of 99.2, VAS ~0.1 at rest and under load
- No revisions for aseptic loosening (1 case already reported in the 5-year follow-up study).
Clinical takeaway:
Long-term data showed low subsidence rates and sustained clinical and radiographic outcomes at 10 years, confirming the durability and fixation stability of the optimys stem over time.
Clinically relevant differences in stress shielding between two short-stemmed femoral prostheses
Werneburg et al, Archives of Orthopaedic and Trauma Surgery
Key results from the study:
- Cohort: 25 patients (optimys) and 27 patients (Nanos, S&N)
- Both stems showed excellent HHS improvement
- No significant differences in stem angulation, leg length discrepancy, or offset restoration
Clinical takeaway:
optimys demonstrated significantly less proximal stress shielding, suggesting better load distribution and bone stock preservation – key factors for revision and implant longevity - especially in younger patients.
Gait analysis in a matched cohort short versus conventional stems in total hip replacement: Is there a measurable difference?
de Waard et al, Heliyon
Key Results from the study:
- +13% Hip Abduction Moment with optimys → better muscle efficiency
- Faster walking speed and higher trunk lean in optimys
- Higher HOOS scores in optimys (all domains)
Clinical takeaway:
optimys shows better biomechanical restoration and walking efficiency compared to conventional stems. Differences are clinically meaningful, even if not all are statistically significant.