Abstract
Background
Positioning of total hip bearings involves tradeoffs, because cup orientations most favorable in terms of stability are not necessarily ideal in terms of reduction of contact stress and wear potential. Previous studies and models have not addressed these potentially competing considerations for optimal total hip arthroplasty (THA) function.
Questions/purposes
We therefore asked if component positioning in total hips could be addressed in terms of balancing bearing surface wear and stability. Specifically, we sought to identify acetabular component inclination and anteversion orientation, which simultaneously resulted in minimal wear while maximizing construct stability, for several permutations of femoral head diameter and femoral stem anteversion.
Methods
A validated metal-on-metal THA finite element (FE) model was used in this investigation. Five dislocation-prone motions as well as gait were considered as were permutations of femoral anteversion (0°–30°), femoral head diameter (32–48 mm), cup inclination (25°–75°), and cup anteversion (0°–50°), resulting in 4320 distinct FE simulations. A novel metric was developed to identify a range of favorable cup orientations (so-called “landing zone”) by considering both surface wear and component stability.
Results
When considering both wear and stability with equal weight, ideal cup position was more restrictive than the historically defined safe zone and was substantially more sensitive to cup anteversion than to inclination. Ideal acetabular positioning varied with both femoral head diameter and femoral version. In general, ideal cup inclination decreased with increased head diameter (approximately 0.5° per millimeter increase in head diameter). Additionally, ideal inclination increased with increased values of femoral anteversion (approximately 0.3° per degree increase in stem anteversion). Conversely, ideal cup anteversion increased with increased femoral head diameter (0.3° per millimeter increase) and decreased with increased femoral stem anteversion (approximately 0.3° per degree increase). Regressions demonstrated strong correlations between optimal cup inclination versus head diameter (Pearson’s r = −0.88), between optimal cup inclination versus femoral anteversion (r = 0.96), between optimal cup anteversion versus head diameter (r = 0.99), and between optimal cup anteversion and femoral anteversion (r = −0.98). For a 36-mm cup with a 20° anteverted stem, the ideal cup orientation was 46° ± 12° inclination and 15° ± 4° anteversion.
Conclusions
The range of cup orientations that maximized stability and minimized wear (so-called “landing zone”) was substantially smaller than historical guidelines and specifically did not increase with increased head size, challenging the presumption that larger heads are more forgiving. In particular, when the cup is oriented to improve not only stability, but also wear in the model, there was little or no added stability achieved by the use of larger femoral heads. Additionally, ideal cup positioning was more sensitive to cup anteversion than to inclination.
Clinical Relevance
Positioning THA bearings involves tradeoffs regarding stability and long-term bearing wear. Cup positions most favorable to minimization of wear such as low inclination and elevated anteversion were detrimental in terms of construct stability. Orientations were identified that best balanced the competing considerations of wear and stability.
Similar content being viewed by others
References
Ackland M, Bourne W, Uhthoff H. Anteversion of the acetabular cup. Measurement of angle after total hip replacement. J Bone Joint Surg Br. 1986;68:409–413.
Anthony P, Gie G, Howie C, Ling R. Localised endosteal bone lysis in relation to the femoral components of cemented total hip arthroplasties. J Bone Joint Surg Br. 1990;72:971–979.
Archard J. Contact and rubbing of flat surfaces. J Appl Phys. 1953;24:981–988.
Barrack RL, Krempec JA, Clohisy JC, McDonald DJ, Ricci WM, Ruh EL, Nunley RM. Accuracy of acetabular component position in hip arthroplasty. J Bone Joint Surg Am. 2013;95:1760–1768.
Barrack RL, Lavernia C, Ries M, Thornberry R, Tozakoglou E. Virtual reality computer animation of the effect of component position and design on stability after total hip arthroplasty. Orthop Clin North Am. 2001;32:569–577.
Bernstein M, Walsh A, Petit A, Zukor DJ, Antoniou J. Femoral head size does not affect ion values in metal-on-metal total hips. Clin Orthop Relat Res. 2011;469:1642–1650.
Biedermann R, Tonin A, Krismer M, Rachbauer F, Eibl G, Stöckl B. Reducing the risk of dislocation after total hip arthroplasty: the effect of orientation of the acetabular component. J Bone Joint Surg Br. 2005;87:762–769.
Bono JV, Sanford L, Toussaint JT. Severe polyethylene wear in total hip arthroplasty: observations from retrieved AML PLUS hip implants with an ACS polyethylene liner. J Arthroplasty. 1994;9:119–125.
Bozic KJ, Kurtz SM, Lau E, Ong K, Vail TP, Berry DJ. The epidemiology of revision total hip arthroplasty in the United States. J Bone Joint Surg Am. 2009;91:128–133.
Brockett C, Williams S, Jin Z, Isaac G, Fisher J. Friction of total hip replacements with different bearings and loading conditions. J Biomed Mater Res B Appl Biomater. 2007;81:508–515.
Brodner W, Grübl A, Jankovsky R, Meisinger V, Lehr S, Gottsauner-Wolf F. Cup inclination and serum concentration of cobalt and chromium after metal-on-metal total hip arthroplasty. J Arthroplasty. 2004;19:66–70.
Browne JA, Bechtold CD, Berry DJ, Hanssen AD, Lewallen DG. Failed metal-on-metal hip arthroplasties: a spectrum of clinical presentations and operative findings. Clin Orthop Relat Res. 2010;468:2313–2320.
Cooper HJ, Della Valle CJ, Berger RA, Tetreault M, Paprosky WG, Sporer SM, Jacobs JJ. Corrosion at the head-neck taper as a cause for adverse local tissue reactions after total hip arthroplasty. J Bone Joint Surg Am. 2012;94:1655–1661.
De Haan R, Pattyn C, Gill HS, Murray DW, Campbell PA, De Smet K. Correlation between inclination of the acetabular component and metal ion levels in metal-on-metal hip resurfacing replacement. J Bone Joint Surg Br. 2008;90:1291–1297.
Del Schutte H Jr, Lipman AJ, Bannar SM, Livermore JT, Ilstrup D, Morrey BF. Effects of acetabular abduction on cup wear rates in total hip arthroplasty. J Arthroplasty. 1998;13:621–626.
Dorr LD, Wan Z, Malik A, Zhu J, Dastane M, Deshmane P. A comparison of surgeon estimation and computed tomographic measurement of femoral component anteversion in cementless total hip arthroplasty. J Bone Joint Surg Am. 2009;91:2598–2604.
Dorr LD, Wolf AW, Chandler R, Conaty JP. Classification and treatment of dislocations of total hip arthroplasty. Clin Orthop Relat Res. 1983;173:151–158.
Ebramzadeh E, Campbell PA, Takamura KM, Lu Z, Sangiorgio SN, Kalma JJ, De Smet KA, Amstutz HC. Failure modes of 433 metal-on-metal hip implants: how, why, and wear. Orthop Clin North Am. 2011;42:241–250.
Elkins JM, Callaghan JJ, Brown TD. Stability and trunnion wear potential in large-diameter metal-on-metal total hips: a finite element analysis. Clin Orthop Relat Res. 2014;472:529–542.
Elkins JM, Kruger KM, Pedersen DR, Callaghan JJ, Brown TD. Edge-loading severity as a function of cup lip radius in metal-on-metal total hips—a finite element analysis. J Orthop Res. 2012;30:169–177.
Elkins JM, O’Brien MK, Stroud NJ, Pedersen DR, Callaghan JJ, Brown TD. Hard-on-hard total hip impingement causes extreme contact stress concentrations. Clin Orthop Relat Res. 2011;469:454–463.
Elkins JM, Pedersen DR, Callaghan JJ, Brown TD. Bone-on-bone versus hardware impingement in total hips: a biomechanical study. Iowa Orthop J. 2012;32:17–21.
Elkins JM, Stroud NJ, Rudert MJ, Tochigi Y, Pedersen DR, Ellis BJ, Callaghan JJ, Weiss JA, Brown TD. The capsule’s contribution to total hip construct stability—a finite element analysis. J Orthop Res. 2011;29:1642–1648.
Griffin WL, Nanson CJ, Springer BD, Davies MA, Fehring TK. Reduced articular surface of one-piece cups: a cause of runaway wear and early failure. Clin Orthop Relat Res. 2010;468:2328–2332.
Jolles BM, Zangger P, Leyvraz PF. Factors predisposing to dislocation after primary total hip arthroplasty. J Arthroplasty. 2002;17:282–288.
Kennedy J, Rogers W, Soffe K, Sullivan R, Griffen D, Sheehan L. Effect of acetabular component orientation on recurrent dislocation, pelvic osteolysis, polyethylene wear, and component migration. J Arthroplasty. 1998;13:530–534.
Kluess D, Martin H, Mittelmeier W, Schmitz KP, Bader R. Influence of femoral head size on impingement, dislocation and stress distribution in total hip replacement. Med Eng Phys. 2007;29:465–471.
Langton D, Jameson S, Joyce T, Gandhi J, Sidaginamale R, Mereddy P, Lord J, Nargol A. Accelerating failure rate of the ASR total hip replacement. J Bone Joint Surg Br. 2011;93:1011–1016.
Langton D, Jameson S, Joyce T, Webb J, Nargol A. The effect of component size and orientation on the concentrations of metal ions after resurfacing arthroplasty of the hip. J Bone Joint Surg Br. 2008;90:1143–1151.
Langton D, Sprowson A, Joyce T, Reed M, Carluke I, Partington P, Nargol A. Blood metal ion concentrations after hip resurfacing arthroplasty. J Bone Joint Surg Br. 2009;91:1287–1295.
Lewinnek GE, Lewis JL, Tarr R, Compere CL, Zimmerman JR. Dislocations after total hip-replacement arthroplasties. J Bone Joint Surg Am. 1978;60:217–220.
Lusty PJ, Watson A, Tuke MA, Walter WL, Walter WK, Zicat B. Wear and acetabular component orientation in third generation alumina-on-alumina ceramic bearings: an analysis of 33 retrievals. J Bone Joint Surg Br. 2007;89:1158–1164.
McCollum DE, Gray WJ. Dislocation after total hip arthroplasty. Causes and prevention. Clin Orthop Relat Res. 1990;261:159–170.
Morlock M, Schneider E, Bluhm A, Vollmer M, Bergmann G, Muller V, Honl M. Duration and frequency of every day activities in total hip patients. J Biomech. 2001;34:873–881.
Murray D. The definition and measurement of acetabular orientation. J Bone Joint Surg Br. 1993;75:228–232.
Nadzadi ME, Pedersen DR, Yack HJ, Callaghan JJ, Brown TD. Kinematics, kinetics, and finite element analysis of commonplace maneuvers at risk for total hip dislocation. J Biomech. 2003;36:577–591.
Ong K, Mowat F, Chan N, Lau E, Halpern M, Kurtz S. Economic burden of revision hip and knee arthroplasty in Medicare enrollees. Clin Orthop Relat Res. 2006;446:22–28.
Pierchon F, Pasquier G, Cotten A, Fontaine C, Clarisse J, Duquennoy A. Causes of dislocation of total hip arthroplasty. CT study of component alignment. J Bone Joint Surg Br. 1994;76:45–48.
Schmalzried T, Jasty M, Harris W. Periprosthetic bone loss in total hip arthroplasty. Polyethylene wear debris and the concept of the effective joint space. J Bone Joint Surg Am. 1992;74:849–863.
Schmalzried TP, Guttmann D, Grecula M, Amstutz HC. The relationship between the design, position, and articular wear of acetabular components inserted without cement and the development of pelvic osteolysis. J Bone Joint Surg Am. 1994;76:677–688.
Scifert CF, Brown TD, Pedersen DR, Callaghan JJ. A finite element analysis of factors influencing total hip dislocation. Clin Orthop Relat Res. 1998;355:152–162.
Widmer KH, Zurfluh B. Compliant positioning of total hip components for optimal range of motion. J Orthop Res. 2004;22:815–821.
Wines AP, McNicol D. Computed tomography measurement of the accuracy of component version in total hip arthroplasty. J Arthroplasty. 2006;21:696–701.
Yoshimine F. The safe-zones for combined cup and neck anteversions that fulfill the essential range of motion and their optimum combination in total hip replacements. J Biomech. 2006;39:1315–1323.
Acknowledgments
Dr Douglas Pedersen provided valuable engineering collaboration in several earlier phases of FE model development. We appreciate the assistance of Dr Steve Liu in preparation of this manuscript. Helpful technical data regarding implant design parameters were provided by DePuy, Inc.
Author information
Authors and Affiliations
Corresponding author
Additional information
The institutions of one or more of the authors have received, during the study period, funding from the National Institutes of Health (Grants AR46601 and AR53553) (TDB), the Veterans Administration (JJC, TDB), and the National Center for Research Resources (Grant UL1 RR024979) (JME). One of the authors (JJC) certifies that he or she, or a member of his or her immediate family, has received or may receive payments or benefits, during the study period, an amount of more than USD 1,000,001, from DePuy Orthopaedics, Inc (Warsaw, IN, USA). One of the authors (TDB) certifies that he or she, or a member of his or her immediate family, has received or may receive payments or benefits, during the study period, an amount of USD 10,000 to USD 100,000, from Smith & Nephew, Inc (Memphis, TN, USA).
All ICMJE Conflict of Interest Forms for authors and Clinical Orthopaedics and Related Research ® editors and board members are on file with the publication and can be viewed on request.
Clinical Orthopaedics and Related Research ® neither advocates nor endorses the use of any treatment, drug, or device. Readers are encouraged to always seek additional information, including FDA-approval status, of any drug or device prior to clinical use.
About this article
Cite this article
Elkins, J.M., Callaghan, J.J. & Brown, T.D. The 2014 Frank Stinchfield Award: The ‘Landing Zone’ for Wear and Stability in Total Hip Arthroplasty Is Smaller Than We Thought: A Computational Analysis. Clin Orthop Relat Res 473, 441–452 (2015). https://doi.org/10.1007/s11999-014-3818-0
Published:
Issue Date:
DOI: https://doi.org/10.1007/s11999-014-3818-0