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Cale A. Jacobs, Christian P. Christensen and Michael E. Berend

Over the past 10–15 years, many aspects of total hip arthroplasty (THA) have changed. First and foremost, the patients themselves have changed. Since 1990, the age group that has demonstrated the greatest increase in THA was patients between the ages of 45 and 64. As younger, healthier patients are having surgery, a greater emphasis is being placed on postoperative function, activity, and exercise. The rationale for increased postoperative activity is 2-fold: the obvious cardiovascular benefits of exercise and greater patient desire to return to recreational sporting activities. The purpose of this review is to discuss how recent changes in surgical technique, implant design, and pre- and postoperative rehabilitation have affected postoperative athletic activity for THA patients. Although these topics have been addressed often in the orthopedic literature, to our knowledge no published articles have summarized this information for a targeted audience of rehabilitation specialists.

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Patrice Rougier, Dalila Belaid, Sylvie Cantalloube, Delphine Lamotte and Jacques Deschamps

To assess the postural strategies developed by patients after total hip arthroplasty (THA), 14 patients were measured 12 days after surgery. The respective role played by both sound and prosthetic legs and the compensatory mechanisms were assessed through a separate measure of the center-of-pressure (CP) trajectories under each foot. The movements of the center-of-gravity (CG) were estimated from those of the resultant CP to determine postural performance. The postural behavior was compared with those of a group of age-matched healthy subjects required to adopt a slightly asymmetrical weight distribution. Patient results indicate greater movements for both plantar and resultant CP displacements, principally along the antero-posterior (AP) axis, a decreased contribution of the hip mechanisms in the production of CP displacements along the medio-lateral (ML) axis, greater resultant CP and CG movements along the AP axis and increased differences between CP and CG along both ML and AP axes. The postural specificity of the THA patients appears to be due to a global sensorimotor impairment that alters the control of the loading-unloading mechanism at the hip level.

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Emmanuel Frimpong, Joanne A. McVeigh and Rebecca M. Meiring

review by Arnold et al. ( 2016 ) summarized objectively measured PA after both total hip arthroplasty (THA) and TKA and concluded that negligible changes in PA occur following TKA. Furthermore, a recent systematic review and meta-analysis also synthesized changes in PA only relative to pain, quality of

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Pawel R. Golyski, Elizabeth M. Bell, Elizabeth M. Husson, Erik J. Wolf and Brad D. Hendershot

given kinetic or kinematic variable). For example, kinetic-based biofeedback from a force-measuring treadmill improved symmetry in peak limb loading for patients with total hip arthroplasty (THA) and transtibial amputation, 7 , 8 and kinematic-based biofeedback strategies such as increasing lateral

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Jonathon R. Staples, Kevin A. Schafer, Matthew V. Smith, John Motley, Mark Halstead, Andrew Blackman, Amanda Haas, Karen Steger-May, Matthew J. Matava, Rick W. Wright and Robert H. Brophy

. 2016 ; 12 ( 1 ): 26 – 31 . PubMed ID: 26855624 doi: 10.1007/s11420-015-9458-4 26855624 29. Larkin B , Nyazee H , Motley J , Nunley RM , Clohisy JC , Barrack RL . Hip resurfacing does not improve proprioception compared with THA . Clin Orthop Relat Res . 2014 ; 472 ( 2 ): 555 – 561

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Jesse King and Robert Madrigal

-Based Systems, 19 ( 7 ), 471 – 479 . doi:10.1016/j.knosys.2006.04.007 10.1016/j.knosys.2006.04.007 Walraven , M. , Koning , R.H. , Bijmolt , T.H.A. , & Los , B. ( 2016 ). Benchmarking sports sponsorship performance: Efficiency assessment with data envelopment analysis . Journal of Sport Management

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David I. Anderson

, M.A. , Nash , M.D. , Fagg , A.H. , Ding , L. , Kolobe , T.H.A. , & Miller , D.P. ( 2016 ). Novel assistive device for teaching crawling skills to infants . In D.S. Wettergreen , & T.D. Barfoot (Eds.), Field and service robotics . Springer tracts in advanced robotics (Vol.  113