Use of HA–PLLA Composite Screws to Fix Acetabular Bone Graft in Cemented THA: Absorption Pattern of Screws in Six Patients

Koji Goto; Haruhiko Akiyama; Keiichi Kawanabe; Kazutaka So; Takashi Nakamura

doi:10.4028/www.scientific.net/KEM.493-494.422

Paper Titles

The Influence of Three Additives on the Setting Reaction Kinetics and Mechanical Strength Evolution of [Alpha]-Tricalcium Phosphate Cements
p.397

PH Evolution and Cytotoxicity of [Alpha]-Tricalcium Phosphate Cement with Three Different Additives
p.403

Mechanical Properties of Calcium Phosphate Cements (CPC) for Bone Substitution: Influence of Fabrication and Microstructure
p.409

Effect of Liquid/Powder Ratio on the Setting, Handling and Mechanical Properties of Collagen–Apatitic Cements
p.415

Use of HA–PLLA Composite Screws to Fix Acetabular Bone Graft in Cemented THA: Absorption Pattern of Screws in Six Patients
p.422

Simultaneous Implantation of Dental Implants and Autogenous Human Dentin
p.426

Tribological Characterization of Porous TiO₂ Coatings Produced by Electrodeposition
p.430

Effect of Electrolyte Chemistry on the Structural, Morphological and Corrosion Characteristics of Titania Films Developed on Ti-6Al-4V Implant Material by Plasma Electrolytic Oxidation
p.436

Effect of XPEED^® on Ti Implants with Deep Threads
p.442

HomeKey Engineering MaterialsKey Engineering Materials Vols. 493-494Use of HA–PLLA Composite Screws to Fix Acetabular...

Use of HA–PLLA Composite Screws to Fix Acetabular Bone Graft in Cemented THA: Absorption Pattern of Screws in Six Patients

Abstract:

We used a composite of uncalcined and unsintered hydroxyapatite (u-HA) particles and poly-l-lactide (PLLA) to fix the acetabular bone graft in total hip arthroplasty (THA) in a clinical trial in six patients, and followed them for over 10 years. The patients were evaluated clinically and radiologically to assess the safety and efficacy of the screws and the characteristics of their absorption. No patient in this series experienced revision or radiographic loosening during the follow-up period. The configurations of the HA–PLLA composite screws were confirmed on early post-operative radiographs in every case, whereas they appeared obscure on radiographs within 5 years after surgery, and only osteosclerotic traces remained in the screw positions at the final follow-up. Some screw heads were covered with bone within 3 months of surgery, and some screw heads migrated laterally with breakage, but were absorbed in situ within 5 years. The screws seemed to have no negative effect on the mid-term clinical results of the THAs.