No improvement in long-term wear and revision rates with the second-generation Biomet cup (RingLoc) in young patients: 141 hips followed for median 12 years

Optimising joint reconstruction management in arthritis and bone tumour patient

Bipolar cemented hip hemiarthroplasty in patients with femoral neck fracture who are on hemodialysis is associated with risk of stem migration

Background and purpose Femoral neck fractures are considerably more common in patients on hemodialysis than in the general population. We determined the outcome of bipolar hemiarthroplasty for hip fracture in patients with long-term hemodialysis and compared it with that of a matched-paired group of patients with intact renal function

The History of Biomechanics in Total Hip Arthroplasty.

Biomechanics of the hip joint describes how the complex combination of osseous, ligamentous, and muscular structures transfers the weight of the body from the axial skeleton into the appendicular skeleton of the lower limbs. Throughout history, several biomechanical studies based on theoretical mathematics, in vitro, in vivo as well as in silico models have been successfully performed. The insights gained from these studies have improved our understanding of the development of mechanical hip pathologies such as osteoarthritis, hip fractures, and developmental dysplasia of the hip. The main treatment of end-stage degeneration of the hip is total hip arthroplasty (THA). The increasing number of patients undergoing this surgical procedure, as well as their demand for more than just pain relief and leading an active lifestyle, has challenged surgeons and implant manufacturers to deliver higher function as well as longevity with the prosthesis. The science of biomechanics has played and will continue to play a crucial and integral role in achieving these goals. The aim of this article, therefore, is to present to the readers the key concepts in biomechanics of the hip and their application to THA

Mapping the importance of the real world: the validity of connectivity analysis of patent citations networks

[EN] Recent empirical findings have questioned the use of patent citations as a measure. This points to the need of validation of patent citations methodologies, which we address by testing a recent methodology for studying technological evolution, namely connectivity analysis of citation networks. We find connectivity analysis to be a valid tool to identify the reliable knowledge which opens the way to further technological evolution of a surgical prosthesis, the artificial spinal disc. We also illustrate how connectivity analysis represents how this reliable knowledge differs depending on the stage of technological evolution. The corroborated validity of connectivity analysis of patent citations may trigger a renaissance in the use of this kind of patent data. (C) 2010 Elsevier B.V. All rights reserved.We would like to thank Arianna Martinelli, Gerald Silverberg, Lee Davies, Francesco Rulliani, Davide Consoli and three anonymous reviewers for their helpful comments on earlier versions of this manuscript. Remaining errors and omissions are entirely our own.Barberá Tomás, JD.; Jiménez Saez, F.; Castelló Molina, I. (2011). Mapping the importance of the real world: the validity of connectivity analysis of patent citations networks. Research Policy. 40(3):473-486. doi:10.1016/j.respol.2010.11.002S47348640

Influence of surgical approach on component positioning in primary total hip arthroplasty

Background: Minimal invasive surgery (MIS) has gained growing popularity in total hip arthroplasty (THA) but concerns exist regarding component malpositioning. The aim of the present study was to evaluate femoral and acetabular component positioning in primary cementless THA comparing a lateral to a MIS anterolateral approach. Methods: We evaluated 6 week postoperative radiographs of 52 hips with a minimal invasive anterolateral approach compared to 54 hips with a standard lateral approach. All hips had received the same type of implant for primary cementless unilateral THA and had a healthy hip contralaterally. Results: Hip offset was equally restored comparing both approaches. No influence of the approach was observed with regard to reconstruction of acetabular offset, femoral offset, vertical placement of the center of rotation, stem alignment and leg length discrepancy. However, with the MIS approach, a significantly higher percentage of cups (38.5 %) was malpositioned compared to the standard approach (16.7 %) (p = 0.022). Conclusions: The MIS anterolateral approach allows for comparable reconstruction of stem position, offset and center of rotation compared to the lateral approach. However, surgeons must be aware of a higher risk of cup malpositioning for inclination and anteversion using the MIS anterolateral approach

Acute appendicitis presenting as chest pain

AbstractIntroductionAbdominal pain is the primary presenting complaint of patients with acute appendicitis. Acute appendicitis presenting as chest pain is extremely rare and according to our search such presentation due to herniation of appendix into thorax through congenital diaphragmatic defect has not yet been reported.Presentation of caseWe present a case of a 12year old male child who presented with acute chest pain. ECG was suggestive of ischemic changes. Echocardiogram and cardiac enzymes were within normal limits. Chest X-ray and gastrograffin contrast study confirmed the diagnosis of congenital diaphragmatic hernia. On exploration inflamed appendix was found herniated through the diaphragm along with caecum, ascending colon and transverse colon. Histology confirmed the diagnosis of acute appendicitis.DiscussionAcute appendicitis may sometimes have very varied and rare presentation. In late presenting CDH, the most important factor responsible for acute or chronic presentation seems to be the type of herniated viscera.ConclusionThis report presents a rare case of late-presenting CDH with herniated appendix along with caecum, ascending colon and transverse colon. Unusual presentation of chest pain was due to an attack of acute appendicitis. Late-presenting CDH is a very intriguing defect with a wide spectrum of clinical manifestations. It should be suspected in cases of unexplained acute or chronic respiratory or gastrointestinal symptoms, and abnormal chest radiographic findings. The prognosis is favorable with correct diagnosis and prompt surgical repair