ENDOPROSTHESIS WITH SAPPHIRE HEAD FOR THE TREATMENT OF
THE DISEASES AND DAMAGES OF THE HIP JOINT
LIFE SCIENCES • MEDICAL RESEARCH
Description
Different artificial joints with metal, ceramic, metal-polymer
and ceramic polymer trybological pairs which correspond to
the natural biomechanical joint "head-acetabulum" are widely
used for the hip joint arthroplasty at present time. Along with
positive qualities of modern ceramic, polymer and metal con-
structions, they have some disadvantages, such as: insuffi-
cient biological inactivity and superfluous abrasion of the com-
ponents. These factors lead to short life of the implant.
Moreover, accumulation of toxic and carcinogenic substances
in the soft tissue due to abrasion of the implant causes seri-
ous complications in up to 30%-40% cases.
We developed endoprosthesis with sapphire head for treat-
ment of diseases and damages of the hip join.
Innovative Aspect and Main Advantages
Endoprosthesis consists of a metal stem, sapphire head and
lowmolecular polyethylene intermediate layer. Sapphire heads
manufactured from pure material storage-oxide, which was
synthesized in the temperature >2000° C.
Sapphire head has the following characteristics and advan-
tages:
• does not resolve and its qualities do notchange during the
patient's life; has high level of biological compatibility;
• has constant effect of the friction (f = 0,05-0,10) with
defined crystallography of the contacted sapphire trybilogical
situations;
• has high durability;
• may bear 50kN;
• may be polished to high degree of the purity (higher then in
metal and ceramic analogs).
In comparison with metal heads, allergic reactions are exclud-
ed. In comparison with corundum ceramic heads, single-crys-
tal head is more durable because the sapphire is homoge-
neous and does not have bloc's borders, that results in high
wearproofness of material.
Areas of Application
Orthopedy and traumatology.
Stage of Development
Endoprosthesis with sapphire head is developed. Prototype
samples are made and studied in experiments. Animal trials
of the samples and clinical approbation in 10 patients are
done.
Fig. 1. General veiw of the hip joint endoprosthesis with sapphire
head
Fig.2. X-ray photograph of
the patient before opera-
tion (a) and after operation
(b)
b
a
Contact Details
1 Dr. Volodimir Filipenko
Sytenko Institute of Spine and Joint pathology, Ukrainian
Academy of Medical Sciences
Director: Nicolay Korzh
Address: 80, st. Pushkinskaya, Kharkov, 61024, Ukraine
Tel. (8-057) 704-14-78
Fax (8-057) 700-11-27
E-mail: filippenko@valor.ua
2. Dr. Leonid Lytvynov
Institute for Single Crystals
Tel: (380) 57-341-01-47
Fax: (380)57-340-86-19
E-mail: lvtwnov@isc.kharkov.ua
STCU Senior Specialist:
Nataliya Mykhaylovska
nataliva.mvkhavlovska@stcu.int
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