 | If you are one of the many people currently considering total hip replacement surgery, the Summit™ Cemented Hip System may be on option your surgeon will choose. The SUMMIT Cemented Hip System's advanced stem design is intended to restore mobility. The system is made of cobalt chrome alloy-a compound more rigid than most metals, which helps transmit stress created by physical |
| activities more evenly throughout the cement mantle of the implant. The SUMMIT System's design and architecture allows for a composite range of motion that exceeds the range required for the normal daily activities of most hip replacement patients. It also provides surgeons more freedom to position the implant of each individual patient compared to traditional, less flexible hip stem designs. |
| How Does the Hip Work? |
| Your hip joint is a ball-and-socket joint. It is made up of a 'ball' that is a part of the top of your thighbone (femur).The ball fits into your socket, (acetabulum) which is a part of your hip or pelvic bone. All total hip replacement systems require the removal of the arthritic ball portion of the hip and a resurfacing of the socket as well. Metallic and plastic parts are used to replace the ball and socket and the design of the replacement parts varies with different hip replacement. |
| In an artificial hip, an acetabular cup is usually comprised of a metal shell with a plastic liner-this replaces your socket. The femoral stem is inserted inside the canal of the femur bone, and the femoral head fits into the acetabulum. systems. |
| How do Cemented Implants Work? |
| When using a cemented implant, such as the SUMMIT Cemented Hip System, a surgeon determines how much of the bone in the center of a patient's femur needs to be removed in order to fit the length and size of the stem of an hip implant. |
 Before implanting a stem, a surgeon will use a trial stem and neck segment and a trial size ball. The trial implant allows the surgeon to check the fit, be sure that the angle of the neck will hold the ball in the right position within the socket, and be sure that the leg length will be the same as the other leg. After the surgeon checks the trial stem, he or she will clean, brush and dry the canal. |
| Then comes an important step-bone cement. The cement is injected into the canal using a specially designed syringe. Timing is important because the stem of a hip replacement system must be fitted into place and secured before cement around it becomes solid. |
| Why Choose the SUMMIT Cemented Hip System? |
| The SUMMIT Cemented Hip System combines precision design, cement mantle integrity, biomechanical excellence, and an advanced cementing technique. The cement mantle is the wall of cement between the bone and implant. The SUMMIT Cemented Hip System has a broach that meets the needs of a majority of patients-this is a result of combining data from the DePuy Global CT database with extensive radiographic analysis used to create the broach geometry that matches the geometry of the human thigh bone (femur). The broach is a part of the SUMMIT Cemented Hip System instrumentation that assists in preparing the femur for the implant. The SUMMIT Cemented Hip System's patented centralization system produces balance in the cement mantle surrounding the femoral component, and helps equalize stress that comes from the femoral component and travels through the cement mantle to the bone. Cemented stems are under torsional loads during high levels of patient activity such as stair climbing or rising from a chair. Torsional load is a result of turning and twisting of the hip stem. Too much torsional load can result in loosening of the hip stem or a fracture of the cement mantle (the cemented area surrounding the stem). The SUMMIT Cemented Hip System stem has been designed to reduce the amount of torsional load on the cement mantle, which reduces the chance of loosening of the stem or fracturing of the mantle. The SUMMIT Cemented Hip System can also be used in conjunction with the Pinnacle™ Acetabular Cup System. The PINNACLE Acetabular Cup System is made up of a metal component and a polyethylene or metal liner. The PINNACLE Acetabular Cup System is designed to replace the socket portion (acetabulum) of the pelvis. Ask your MBO Specialist if the SUMMIT Cemented Hip System is right for you. |
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| What are the Results with the SUMMIT Cemented Hip System? |
| Total hip replacement surgeries are intended to provide increased patient mobility and reduced pain by replacing the damaged hip joint articulation in patients where there is evidence of sufficient and sound bone to seat and support the components. The SUMMIT Cemented Hip System follows the classic Sir John Charnley heritage. Sir Charnley is a pioneer in the field of total hip replacement, instrumental in developing successful, low-friction arthroplasty more than 40 years ago. |
| Warnings and Precautions: |
| The following conditions tend to adversely affect hip replacement implants: excessive patient weight, high levels of patient activity, likelihood of falls, poor bone stock, metabolic disorders, disabilities of other joints |
| Adverse Events: |
| The following are the most frequent adverse events after hip arthroplasty: change in position of the components, loosening of components, fracture of components, dislocation, infection, tissue reaction. |
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