Preferably, one or both of hole 28 and element 30 are tapered to create a secure interference fit. The disclosed inserts are intended to more snugly contact the anterior and posterior surfaces of the intramedullary canal. No significant difference is observed in the clinical performance of the various methods of surface treatment of uncemented devices.
Main member 12 includes stem portion 16, body portion 18, neck portion 22 and capitulum At the same time they are also subject to higher stresses such as friction and inertia.
The modular member may be chosen from a plurality of such members having anterior, posterior, and medial sides which are adapted for an accurate fit in the intramedullary canal, and a lateral side configured and dimensioned complimentarily to the medial side of the body portion.
The prosthesis as in claim 5, wherein said member comprises a dovetail. Such a prosthesis is shown in European Patent Application No.
This approach gives excellent access to the acetabulum and femur and preserves the hip abductors and thus minimizes the risk of abductor dysfunction post operatively. Once an uncommon operation reserved for frail patients with a limited life expectancy, hip replacement is now common, even among active athletes including race car drivers Bobby Labonte and Dale Jarrettand the 8-time Major-winning American golfer Tom Watsonwho shot a 67 in the opening round of the Masters Tournament in the year following his operation.
They can include infection, dislocation, limb length inequality, loosening, impingement, osteolysis, metal sensitivity, nerve palsy, chronic pain and death.
Surgeons at leading medical centers such as the Mayo Clinic have reported reducing their use of metal-on-metal implants by 80 percent over the last year in favor of those made from other materials, like combinations of metal and plastic. The interface size is measured by the outside diameter of the head or the inside diameter of the socket.
Also, a person of ordinary skill in the art could provide further connection means in accordance with the teachings of the present invention.
Another prosthesis with an insert design is shown in French Patent No. Charnley's other major contribution was to use polymethylmethacrylate PMMA bone cement to attach the two components to the bone. There are reports of cobalt toxicity with hip replacement patients. Different combinations of materials have different physical properties which can be coupled to reduce the amount of wear debris generated by friction.
Like modern hip implants, it is inserted into the medullary canal of the femur, and depends on bone growth through a hole in the stem for long-term attachment. Also in accordance with the present invention, a kit for the assembly of a hip prosthesis comprises a plurality of first or main members each with a stem portion and a body portion adapted for insertion in the intramedullary canal.
With time, other forms of stem surface treatment and stem geometry have been developed and improved. There exists, therefore, a need in the art for an improved hip prosthesis which permits a surgeon to modify, during revision surgery, the geometry of the medial portion of the prosthetic device to create a more accurate fit with the deformed or flared intramedullary canal.
However, component positioning accuracy and visualization of the bone structures can be significantly impaired as the approaches get smaller. The embodiment shown in FIG.
Its position can be adjusted, unlike the original cemented cup design which are fixed in place once the cement sets. Options exist for different people and indications.
A modular femoral hip prothesis having distal stem and proximal body sections for implantation into a prepared intramedullary canal comprising: Techniques[ edit ] There are several incisions, defined by their relation to the gluteus medius.
There may be a toxic reaction to an excess of particulate metal wear debris or a hypersensitivity reaction to a normal amount of metal debris. Both designs have shown excellent long-term durability when properly placed and are still widely used in slightly modified versions. When proper positioning of the metal shell is obtained, the surgeon may select a liner made from various materials.
A kit for the assembly of a hip prosthesis as in claim 15, wherein at least one said member comprises a dovetail. It formed the basis for all modern hip implants. The force required to distract the neck components from the stem was greater than that required to distract femoral heads from traditional stem tapers.
The ANTHOLOGY system is a hip stem (femoral implant with a neck and ball) used for primary hip replacement surgery. The hip joint is a ball and socket joint, connecting the femur with /5(58). A modular hip prosthesis can be custom fitted to a particular patient by a surgeon prior to surgical insertion.
The prosthesis features a body having a neck portion for carrying a rounded head element, a transitional mid-section of the prosthesis body includes generally rectangular and generally rounded cross-sectional areas, and a stem section has a. Hip. Implants. We offer market-leading hip replacement implants for total hip arthroplasty including our primary and revision portfolios designed to offer you a wide variety of implants, instrumentation and muscle-sparing surgical approach options.
Hip replacement is a surgical procedure in which the hip joint is replaced by a prosthetic implant, that is, a hip prosthesis. Hip replacement surgery can be performed as a. Abstract A modular hip prosthesis for the replacement of a portion of the femur is provided.
The prosthesis is assembled from a kit that includes a stem member having an upper portion and a lower portion, with the lower portion sized to be received in the femur.
The ZMR Hip System is designed to provide intraoperative flexibility and versatility to meet the unpredictable demands of revision hip surgery.A mid-stem modular junction allows for the selection of a /5(41).Modular hip prothesis