Clinical Orthopaedics and Related Research ®

A Publication of The Association of Bone and Joint Surgeons ®

Hip 721 articles

Articles

Pelvic Deformity Influences Acetabular Version and Coverage in Hip Dysplasia

Masanori Fujii MD, Yasuharu Nakashima MD, Taishi Sato MD, Mio Akiyama MD, Yukihide Iwamoto MD

Although a wide variety of acetabular deformities in developmental dysplasia of the hip (DDH) have been reported, the morphologic features of the entire pelvis in DDH are not well characterized and their correlation with acetabular deformity is unknown.

Does Arthroscopic FAI Correction Improve Function with Radiographic Arthritis?

Christopher M. Larson MD, M. Russell Giveans PhD, Mehul Taylor MD

Previous studies reporting the impact of osteoarthritis (OA) on pain and function after hip arthroscopy largely predate resection of femoroacetabular impingement (FAI).

Emerging Ideas: Shared Decision Making in Patients with Osteoarthritis of the Hip and Knee

Kevin J. Bozic MD, MBA, Vanessa Chiu MPH

Despite the widely reported success of total joint arthroplasty (TJA) in reducing pain and improving quality of life and function for patients with hip or knee osteoarthritis, rates of TJA use vary widely throughout the United States, with broad disparities based on geographic, racial, and socioeconomic factors. Shared decision-making approaches, which require an exchange of information between patients and their physicians, can be helpful in improving patient satisfaction with their treatment decision and appropriate use of TJA.

Is Mid-head Resection a Durable Conservative Option in the Presence of Poor Femoral Bone Quality and Distorted Anatomy?

Derek J. W. McMinn MD, FRCS, Chandra Pradhan FRCS, MCh(Orth), Hena Ziaee BSc(Hons), Joseph Daniel FRCS, MS(Orth)

High medium-term survivorship of hip resurfacing arthroplasty in young patients has led to its increased usage. To achieve high survival rates, selecting patients with appropriate proximal femoral morphology and bone quality is important. For patients with poor bone quality or abnormal morphology, the mid-head resection technique is an alternative, bone-conserving procedure but whether this technique results in acceptable complications and survival is unknown.

Acetabular Anteversion with CT in Supine, Simulated Standing, and Sitting Positions in a THA Patient Population

Jean-Yves Lazennec MD, PhD, Patrick Boyer MD, PhD, Michel Gorin MD, Yves Catonné MD, Marc Antoine Rousseau MD, PhD

Appraisal of the orientation of implants in THA dislocations currently is based on imaging done with the patient in the supine position. However, dislocation occurs in standing or sitting positions. Whether measured anteversion differs in images projected in the position of dislocation is unclear.

Do First-generation Highly Crosslinked Polyethylenes Oxidize In Vivo?

Daniel MacDonald BS, Ashlyn Sakona BS, Allyson Ianuzzi PhD, Clare M. Rimnac PhD, Steven M. Kurtz PhD

Highly crosslinked and thermally treated polyethylenes were clinically introduced to reduce wear and osteolysis. Although the crosslinking process improves the wear performance, it also introduces free radicals into the polymer that can subsequently oxidize. Thermal treatments have been implemented to reduce oxidation; however, the efficacy of these methods with regard to reducing in vivo oxidative degradation remains to be seen. Polyethylene oxidation is a concern because it can compromise the ultimate strength and ductility of the material.

Two-stage Total Hip Arthroplasty: How Often Does It Control Methicillin-resistant Infection?

Fay Leung MD, FRCSC, Corey J. Richards MD, MASc, FRCSC, Donald S. Garbuz MD, MHSc, FRCSC, Bassam A. Masri MD, FRCSC, Clive P. Duncan MB, MSc, FRCSC

Methicillin-resistant hip infections are increasingly common. Reports of the surgical management of these patients using two-stage THA show variable control of infection, but all reports used static spacers.

Do Tissues From THA Revision of Highly Crosslinked UHMWPE Liners Contain Wear Debris and Associated Inflammation?

Ryan M. Baxter MS, Theresa A. Freeman PhD, Steven M. Kurtz PhD, Marla J. Steinbeck PhD

Polyethylene wear debris is a major contributor to inflammation and the development of implant loosening, a leading cause of THA revisions. To reduce wear debris, highly crosslinked ultrahigh-molecular-weight polyethylene (UHMWPE) was introduced to improve wear properties of bearing surfaces. As highly crosslinked UHMWPE revision tissues are only now becoming available, it is possible to examine the presence and association of wear debris with inflammation in early implant loosening.

Europium Stearate Additives Delay Oxidation of UHMWPE for Orthopaedic Applications: A Pilot Study

Luis A. Gallardo MS, Ilenia Carpentieri PhD, Michel P. Laurent PhD, Luigi Costa PhD, Markus A. Wimmer PhD

Ultrahigh-molecular-weight polyethylene (UHMWPE) is used as an articulating surface in prosthetic devices. Its failure under various mechanisms after oxidation is of utmost concern. Free radicals formed during the sterilization process using high-energy irradiation result in oxidation. Europium, an element of the lanthanide family, has a unique electron configuration with an unusual lack of preference for directional bonding and notable bonding to oxygen. Because of this, it currently is used in studies for stabilization of polymers such as polyvinyl chloride.

The Iliocapsularis Muscle: An Important Stabilizer in the Dysplastic Hip

D. Babst MD, S. D. Steppacher MD, R. Ganz MD, K. A. Siebenrock MD, M. Tannast MD

The iliocapsularis muscle is a little known muscle overlying the anterior hip capsule postulated to function as a stabilizer of dysplastic hips. Theoretically, this muscle would be hypertrophied in dysplastic hips and, conversely, atrophied in stable and well-constrained hips. However, these observations have not been confirmed and the true function of this muscle remains unknown.