The 1950’s saw the first use of titanium in orthopedic applications and now titanium is the standard material of choice for orthopedic devices such as hip joints, bone screws, knee joints, spinal fusion cages, shoulder and elbow joints, and bone plates.
Titanium has been selected as a metal of choice in the orthopedic segment of the market because it is inert in the human body, it is resistant to attack body fluids, has proven to be compatible with bone density, is strong and has a low modulus, hence making it an excellent material of choice in the orthopedic arena.
The human body readily accepts titanium as it has proven to be more biocompatible than stainless steel or cobalt chrome. In addition, titanium has a higher fatigue strength than many other metals. Compatibility with MRI (Magnetic Resonance Imaging) and CT (Computed Technology) also contribute to the selection of titanium as the material of choice in orthopedic applications.
via Titanium in Medical-Orthopedic | Titanium Industries, Inc..
Tantalum Coated Implants – Strong, Compatible and Durable
Tantalum is a hard, grayish blue metal. Its importance in the field of orthopedics comes from the fact that tantalum coated implants have several properties that can be used to enhance the quality of the implants used in hip replacement.
Implants used in joint replacements are prone for rejection by the body. Artificial replacement implants such as those used in hip replacements are so designed that the material used in these implants are compatible with the body tissues. This property of an implant is called biocompatibility. A tantalum coated implant has a pinhole free surface, which increases the biocompatibility of the implant. Tantalum can be used in coating the implant surface of most of the materials used in hip implants such as stainless steel, ceramic, cobalt chromium and titanium alloys.
via Tantalum Coated Implants – Strong, Compatible and Durable.
Jane Brody, the Times’s Personal Health columnist, recently reported on less invasive techniques for hip replacement that reduce complications and speed recovery. Dr. Patrick A. Meere, an orthopedic surgeon at New York University who specializes in hip and knee arthritis surgery, joined the Consults blog to answer reader questions. Here, Dr. Meere responds to several readers who asked about hip replacement versus hip resurfacing. In addition, see Dr. Meere’s many responses in the Comments section of “Improving on the Hip Replacement”; additional responses will be posted in the coming days, so check back for updates.
via Hip Replacement vs. Hip Resurfacing – NYTimes.com.
Biocompatibility is related to the behavior of biomaterials in various contexts. The term refers to the ability of a material to perform with an appropriate host response in a specific situation. The ambiguity of the term reflects the ongoing development of insights into how biomaterials interact with the human body and eventually how those interactions determine the clinical success of a medical device (such as pacemaker, hip replacement or stent). Modern medical devices and prostheses are often made of more than one material so it might not always be sufficient to talk about the biocompatibility of a specific material.
Indeed, since the immune response and repair functions in the body are so complicated it is not adequate to describe the biocompatibility of a single material in relation to a single cell type or tissue. Sometimes one hears of biocompatibility testing that is a large battery of in vitro test that is used in accordance with ISO 10993 (or other similar standards) to determine if a certain material (or rather biomedical product) is biocompatible. These tests do not determine the biocompatibility of a material, but they constitute an important step towards the animal testing and finally clinical trials that will determine the biocompatibility of the material in a given application, and thus medical devices such as implants or drug delivery devices.
via Biocompatibility – Wikipedia, the free encyclopedia.
Hip Replacement Implant Materials
There are a large number of hip implant devices on the market. Each manufacturer has different models but each style falls into one of four basic material categories:
metal on plastic (polyethylene or UHMWPE)
metal on metal (MoM)
ceramic on plastic (UHMWPE)
ceramic on ceramic (CoC)
These category names reference the materials used for the implant bearings. The stem and ball fit into and articulate against the cup or acetabulum. Each component can be made of one of several materials.
There is no consensus in the orthopedic community regarding the single “best” bearing or material. The choice generally comes down to your surgeon’s preference. Each surgeon has innumerable reasons for choosing one device over another, including his or her personal experience as well as tool and implantation method preferences.
via Hip Replacement Implant Materials | BoneSmart.