Your doctor will consider several factors when determining the appropriate hip implants for you. There are many factors that influence the durability of hip implants, and implant fixation to the bone is one of them. Some implants require bone cement to secure, or fix, the implant in place. Bone cement has been used since the earliest procedures were done and is still used today. Usually bone cement is used in patients with poor bone quality to help stabilize the hip components.
Other implants are manufactured with special coatings and rough surfaces that help your natural bone grow onto it to achieve fixation. An implant with a porous surface or tiny beads, and good quality bone are required for cementless fixation. Sometimes a combination of cement and cementless hip components are used. Most of the hip procedures done in the US are without bone cement.
Stryker offers a wide variety of femoral stems options so your doctor can select the one that fits you best. The femoral stem your doctor chooses will depend on your bone quality, age, and clinical factors as well as surgeon preference. Some femoral stems, such as Accolade®, have a slimmer profile making it better for minimally invasive surgery, and also provides better stability when paired with anatomic femoral heads.
Hydroxylapatite (HA) is a naturally occurring substance that closely resembles natural bone mineral. Bone mineral stores the body's supply of calcium and phosphorus – two minerals critical to one's health. In fact, the two major components of HA are calcium and phosphorus – the predominant components of bone and tooth enamel. HA is applied to some hip implants, particularly acetabular cups and femoral stems, to encourage bone to grow onto it.1 Clinical studies with HA show that patients had early pain relief and rapid restoration of function.1 HA coated femoral stems perform very well in young and active patients.1
Tritanium® is a three-dimensional surface on the acetabular cup that helps hold the implant into the bone.2 The new Tritanium® technology was designed to resemble trabecular bone, a type of spongy bone tissue that provides skeletal support. Tritanium® technology allows for bone to grow into the component2 providing enhanced fixation.3
Tritanium® is made from the highest quality commercially pure Titanium. Studies have shown that it improves bone ingrowth when compared to other alloys.4 This technology may be especially beneficial for patients with low bone density and the 55% of Americans age 50 and older diagnosed with osteoporosis.5
References
1. D’Antonio, et. al. Hydroxyapatitie Femoral Stems for Total Hip Arthroplasty: 10-13 Year Follow-up, CORR, Volume 393, Dec. 2001, pp. 101-111.
2. Stryker Test Report RD-08-009. Evaluation of bone response to porous surfaces using a canine total hip model.
3. Stryker Test Report RD-07-077.
4. Ricci J.L., Kauffman J., Jaffe, W., et al, “Comparison of Osseointegration and Bone Adhesion to Commercially Pure Titanium Alloy,” 23rd Ann.Mtg. Society for Biomaterials, 1997.
5. National Osteoporosis Foundation.
6. Harris Interactive® Patient Study commissioned & conducted by Stryker, September 2003.
Stryker Corporation or its divisions or other corporate affiliated entities own, use or have applied for the following trademarks or service marks: Accolade, Stryker, Tritanium. All other trademarks are trademarks of their respective owners or holders.
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