The primary stability of cementless prostheses is critical for the long-term outcome of the operation. Surgeons are currently driven only by their experience in evaluating the extent of stem stability achieved. The aim of the present work was to develop a new device that enables the stability of a cementless stem to be quantitatively assessed intraoperatively. The angle of the stem/femur rotation under torsion and the torque are acquired and compared in real-time to a pre-set threshold inferred from the literature. The device indicates whether the stem is stable or not. It was extensively tested and finally validated in vitro on cadaveric and composite femurs hosting different sizes of the same kind of prostheses, implanted with different levels of press-fitting. The overall accuracy (23%) takes into account not only the overall measurement error but also the variability due to differences in bone quality and stem press-fitting. This error was deemed sufficient to discriminate between stable and unstable implants.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1016/j.medengphy.2005.07.015 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Outcomes of cerclage wiring for intraoperative calcar fractures in cementless hemiarthroplasty in older patients with femoral neck fractures.
Eur J Trauma Emerg Surg
January 2025
Ankara Etlik City Hospital, Ankara, Turkey.
Background: Cementless hip hemiarthroplasty is one of the options for the treatment of osteoporotic femoral neck fractures. Intraoperative periprosthetic femoral calcar fractures sometimes occur during the surgery, and the use of cerclage wiring to maintain the position and stability of the femoral stem and prevent the progression of the fracture. This study examines the outcomes of cerclage wiring to treat intraoperative periprosthetic calcar fractures in cementless hip hemiarthroplasty in osteoporotic femoral neck fractures.
View Article and Find Full Text PDFContemporary Cementless Patellar Implant Survivorship: A Systematic Review and Meta-Analysis of 3,005 Patellae.
J Knee Surg
January 2025
Department of Orthopedic Surgery, Mayo Clinic, Rochester, Minnesota.
Historically, cementless patellar implants were fraught with issues of fixation and polyethylene wear. However, contemporary cementless patellar implants incorporate modern technologies for implant design and offer the potential for improved biological fixation and longevity. As such, an evaluation of the performance of modern cementless patellae is needed.
View Article and Find Full Text PDFCentral Bone Mineral Density Is Not a Useful Tool to Predict Bone Strength of the Distal Femur for Cementless Total Knee Arthroplasty.
Clin Orthop Surg
December 2024
Department of Orthopaedic Surgery, College of Medicine, The Catholic University of Korea, Seoul, Korea.
Article Synopsis
- Increasing use of cementless total knee arthroplasty (TKA) highlights the need for reliable assessment of bone quality, but the effectiveness of central bone mineral density (BMD) in predicting knee strength is questionable.
- A study involving 191 knees showed a weak correlation between central BMD and actual bone strength at the knee, particularly poor in patients with osteoporosis.
- Findings suggest central BMD measurements are not effective for assessing knee bone strength for cementless TKA, indicating a need for better methods to evaluate bone quality.
Comparing Trabecular Metal Versus Fiber Mesh Cementless Acetabular Components: A Single-Center Study of 6,563 Hips.
J Arthroplasty
November 2024
Nottingham Elective Orthopaedic Services, Nottingham University Hospitals, Nottingham, United Kingdom; University of Nottingham, Nottingham, United Kingdom.
Background: Trabecular metal is being increasingly used in primary total hip arthroplasty (THA). This study compared medium-term (< 15 years) outcomes of fiber mesh titanium and trabecular metal acetabular components.
Methods: This study included 6,563 patients who underwent primary THA with either fiber mesh titanium or trabecular metal-backed acetabular components.
Interference fit of cementless tibial implants and the initial mechanical environment: A micro-CT and DVC study.
J Orthop Res
February 2025
Medical Device Research Institute, College of Science and Engineering, Flinders University, Adelaide, South Australia, Australia.
During cementless total knee arthroplasty (TKA), an overlap between the resected tibia and the implant's geometry, termed interference fit, is introduced to facilitate primary stability and direct bone-implant contact. However, little is known about the actual interference achieved and the resulting mechanical response in the surrounding cancellous bone. The aim of this study was (1) to experimentally quantify the actual interference achieved for a commercially available cementless tibial implant and (2) to assess its effect on the post-impaction cancellous bone strain.
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!