Resection Guide For the ARC™ Tissue Conserving (Neck Sparing) Total Hip Stem - Case Report

  • Robert Pierron, MD
  • Timothy McTighe, Dr. H.S. (hc)

Abstract

Neck sparing total hip designs have been advocated as the next step in tissue preserving total hip arthroplasty1,2,3. In the proximal femur, the femoral neck and the adjoining medial aspect of the femur in the calcar region show the strongest bone structure (Fig. 1) with a high load capacity to support the stem. There are considerable short-term biomechanical advantages concerning reduced bending and torsional moments of the femoral implant/bone interface4 with resection at that level, however, historical review has demonstrated less than desirable bone maintenance over time5. According to Wolff’s Law, the reduction of stresses relative to the pre-implant anatomy would cause bone to adapt itself by reducing its mass, either by becoming more porous (internal remodeling) or by getting thinner (external remodeling)7. The ARC™Neck Sparing stem has a novel internal conical flair that engages the medial calcar and is designed to offload compressive loads maintaining a positive stress transfer to the medial calcar6. The combination of neck resection level and angle are important considerations for neck preserving stem designs. This case report demonstrates a new resection guide that has proven to be simple and reliable.

 Key Words: femoral neck, stress transfer, resection guide, conical flair

References

Pipino F, Keller A. “Tissue-sparing surgery: 25 years experience with femoral neck preserving hip arthroplasty”; J Orthopaed Traumatol (2006) 7:36-41 DOI 10.1007/s10195-006-0120-2

McTighe T, Bryant C, Brazil D, Keggi J, Keppler L. “Early Learning Experience with a Neck Stabilized THA Stem for Treating Osteoarthritis” Poster 2011 World Congress on Osteoarthritis Sept 15-18, 2011 in San Diego, CA

McTighe T, et al. “A New Approach To Neck Sparing THA Stem”; AAOS Poster 32, March 2008, San Francisco

Freeman MAR. “Why Save The Neck?” J. Bone Joint Surg 68B: 346, 1986

Ong K, McTighe T. “FEA of Bone Remodeling for Conventional AML® style stem versus Novel Short Curved Neck Sparing Total Hip Stem” Report on file 2007 JISRF.

Brazil D, McTighe T. FEA Analysis of Neck-Sparing verus Conventional Cementless Stem, Reconstructive Review Oct. 2012

McTighe T, Brazil D. The Clinical/Surgical Team (Members of TSI™ Study Group) T Aram, MD; C Bryant; J. Keggi, L. Keppler, C. Ponder, F. Schmidt, and B. K. Vaughn; Design Rationale and Early Clinical / Surgical Observations with a Short Curved Tissue Sparing Hip Implant “The Apex ARC™ Stem”

Surgical Technique Addendum - Resection Guide HL-014A Rev 6/12, Omnilife ™Science

Published
2012-08-31
How to Cite
Pierron, MD, R., & McTighe, Dr. H.S. (hc), T. (2012). Resection Guide For the ARC™ Tissue Conserving (Neck Sparing) Total Hip Stem - Case Report. Reconstructive Review - Open Access Orthopaedic Journal of Reconstructive Arthroplasty, 2(1). https://doi.org/10.15438/rr.v2i2.16
Section
Case Report

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