Novation® Splined

Stability in Motion

The Novation® Comprehensive Hip System provides stable reconstruction of the widest range of anatomies, state-of-the-art bearing surfaces and low profile instrumentation and implants that are compatible with a multitude of surgical approaches.

1. A 12/14 neck taper will allow coupling with numerous bearing surfaces
2. Neck cross-section is minimized on the medial aspect to increase range of motion, decreasing the chance of post-operative dislocation, while material on the lateral side is maintained for strength¹
3. Independent insertion/extraction features on the press-fit stem allow the stems to be inserted in a controlled manner or removed without damaging the neck of the implant

4. Circumferential titanium plasma coating provides the scratch fit necessary for initial mechanical fixation.^2,3
   Hydroxyapatite (HA) coating is an option on both the tapered and splined stems. The 45 micron HA coating is in the optimal thickness range to allow for biological activity and mechanical integrity⁴

5. Splined stems also rely on proximal fixation for initial stability and are enhanced by the distal splines for added rotational stability. In cases of proximal/distal mismatch, the Splined stem is also available in a Reduced Distal Diameter (RDD) option. A coronal slot reduces stiffness of the stem by up to 20 percent in the larger sizes⁵
6. Splines on the highly polished distal portion of the stem add 1mm press-fit to provide rotational resistance and allow proximal load sharing. Parabolic tip design provides gradual stress transfer at the distal bone interface, which has been shown to reduce the incidence of thigh pain⁶

Features in both Tapered and Splined stems:

• Sizes range from 9mm to 18mm (in 1mm increments) measured near the midpoint of the stem
• A single instrumentation system supports all Novation stems and a variety of surgical approaches

References

1. Sychterz CJ, Claus AM, Engh CA. What We have Learned about Long-Term Cementless Fixation from Autopsy Retrievals. Clin Orthop. 2002 Dec;(405):79-91.

2. Hoaglund FT, Low WD. Anatomy of the Femoral Neck and Head, with Comparative Data From Caucasians and Hong Kong Chinese. Clin Orthop. 1980 Oct;(152):10-6.

3. Emerson RH Jr, Sanders SB, Head WC, Higgins L. The Rate of Femoral Osteolysis After Total Hip Arthroplasty. J Bone Joint Surg Am. 1999 Sep;81(9):1291-8.

4. Geesink R, de Grook K, Klein C. Chemical Implant Fixation using Hydroxyl-apatite Coatings. The Development of a Human Total Hip Prosthesis for Chemical Fixation to Bone using Hydroxylapatite Coatings on Titanium Substrates. Clin Orthop. 1987 Dec;(225):147-70.

5. Data on file at Exactech.

6. Petty W. Thigh Pain Following Cementless Total Hip Implantation Addressed by New Femoral Design. Orthopedic Special Edition, Vol. 2 No. 2.

Novation® is a registered trademark of Exactech, Inc.