Five fresh cadaver pelves were cleaned of soft tissue and instrumented with strain gauges. The acetabula were reamed, and a cementless cup, oversized at the periphery, was inserted. The applied force and cup acceleration were measured during insertion and used to calculate an effective mass of the cup, insertion device, and pelvis during each impact. Periacetabular strains increased variably during cup seating. After the cups were seated, strains continued to increase with postseating impacts. The effective mass remained constant throughout the test, indicating that cup seating is not associated with a change in acceleration. This finding implies that an accurate assessment of cup seating cannot be inferred by surgeon proprioception during impaction, and use of an apical hole in the cup is necessary to determine when the cup has seated.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1054/arth.2002.30412 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Does Fluoroscopic-Aided Enabling Technology Improve Acetabular Component Position and Reduce Radiation Exposure in Direct Anterior Total Hip Arthroplasty?
Surg Technol Int
January 2025
JIS Orthopedics Inc., New Albany, Ohio.
Accurate acetabular component positioning is crucial for the success of total hip arthroplasty (THA). Malplacement of the acetabular component increases the risk of post-surgery complications, most notably dislocation.1 Furthermore, malposition can also result in wear of the polyethylene liner, limited range of motion, and osteolysis.
View Article and Find Full Text PDFMultiple magma recharges over prolonged period ultimately trigger eruptions at Vulcano, Aeolian Islands.
Sci Rep
January 2025
Dipartimento di Scienze Biologiche, Geologiche e Ambientali, Università degli Studi di Catania, Corso Italia 57, Catania, Italy.
The compositional heterogeneity of clinopyroxene in products of the 1888-90 eruption at La Fossa of Vulcano has been used to constrain times of the plumbing system reactivation before the eruption. We have also investigated the temporal trend of the SO flux at La Fossa crater since 1978 to gather information about the origin, depths and quantity of magma involved in the recent degassing crises. Petrological data emphasizes migration of deep-seated magmas and their emplacement in the shallow system, clearly supporting the involvement of three distinct phases of mafic replenishments occurred respectively 85-140, 16-35 and 2-7 years before the 1888-90 eruption.
View Article and Find Full Text PDFGreen Recycling for Polypropylene Components by Material Extrusion.
Polymers (Basel)
December 2024
Dipartimento di Meccanica, Matematica e Management, Politecnico di Bari, 70100 Bari, Italy.
High volumetric shrinkage and rheological behavior of polypropylene (PP) are the main problems that make material extrusion (MEX) uncommon for this material. The complexity is raised when recycled materials are used. This research covered different aspects of the MEX process of virgin and recycled PP, from the analysis of rough materials to the mechanical evaluation of the final products.
View Article and Find Full Text PDFLewinnek zone not "the be-all and end-all" functional planning for acetabular component positioning in total hip arthroplasty.
Arthroplasty
January 2025
Sant'Andrea Hospital, Faculty of Medicine and Psychology, Sapienza University of Rome, 00162, Rome, Italy.
Background: Proper positioning of a total hip arthroplasty (THA) plays a crucial role in the success and long-term survivorship of the implant. Cup positioning within the Lewinnek Safe Zone (LSZ) does not, however, avoid implant dislocation. Thus, the concept of a functional cup position has been introduced.
View Article and Find Full Text PDFLong-term outcomes of a cemented bipolar radial head prosthesis: a large retrospective study.
J Shoulder Elbow Surg
November 2024
Shoulder and Elbow Unit, Department of Orthopaedic Surgery, Hesperia Hospital, Modena, Italy.
Background: In acute radial head fractures (RHFs), a radial head prosthesis can be considered if open reduction and internal fixation are not technically feasible. This study provides the largest long-term clinical and radiologic follow-up study of cemented bipolar Judet prostheses implanted to manage acute RHFs, either isolated and associated with other elbow fractures. We compare their functional and radiographic outcomes to test the hypothesis that the bipolar design can achieve similar results in both groups.
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!