Tibial stress fracture after computer-navigated total knee arthroplasty

A correct alignment of the tibial and femoral component is one of the most important factors determining favourable long-term results of a total knee arthroplasty (TKA). The accuracy provided by the use of the computer navigation systems has been widely described in the literature so that their use has become increasingly popular in recent years; however, unpredictable complications, such as displaced or stress femoral or tibial fractures, have been reported to occur a few weeks after the operation. We present a case of a stress tibial fracture that occurred after a TKA performed with the use of a computer navigation system. The stress fracture, which eventually healed without further complications, occurred at one of the pinhole sites used for the placement of the tibial trackers

Navigated cup implantation in hip arthroplasty: A meta-analysis

Background and purpose Many studies have suggested that navigation-based implantation can improve cup positioning in total hip arthroplasty (THA). We conducted a systematic review and meta-analysis to compile the best available evidence, and to overcome potential shortcomings because of small sample sizes in individual studies

Percutaneous suction and irrigation for the treatment of recalcitrant pyogenic spondylodiscitis.

The primary management of pyogenic spondylodiscitis is conservative. Once the causative organism has been identified, by blood culture or biopsy, administration of appropriate intravenous antibiotics is started. Occasionally patients do not respond to antibiotics and surgical irrigation and debridement is needed. The treatment of these cases is challenging and controversial. Furthermore, many affected patients have significant comorbidities often precluding more extensive surgical intervention. The aim of this study is to describe early results of a novel, minimally invasive percutaneous technique for disc irrigation and debridement in pyogenic spondylodiscitis.This article is freely available via Open Access. Click on the Additional Link above to access the full-text via the publisher's sit

Innovations in total knee replacement: new trends in operative treatment and changes in peri-operative management

The human knee joint can sustain damage due to injury, or more usually osteoarthritis, to one, two or all three of the knee compartments: the medial femorotibial, the lateral femorotibial and the patellofemoral compartments. When pain associated with this damage is unmanageable using nonsurgical techniques, knee replacement surgery might be the most appropriate course of action. This procedure aims to restore a pain-free, fully functional and durable knee joint. Total knee replacement is a well-established treatment modality, and more recently, partial knee replacement—more commonly known as bi- or unicompartmental knee replacement—has seen resurgence in interest and popularity. Combined with the use of minimally invasive surgery (MIS) techniques, gender-specific prosthetics and computer-assisted navigation systems, orthopaedic surgeons are now able to offer patients knee replacement procedures that are associated with (1) minimal risks during and after surgery by avoiding fat embolism, reducing blood loss and minimising soft tissue disruption; (2) smaller incisions; (3) faster and less painful rehabilitation; (4) reduced hospital stay and faster return to normal activities of daily living; (5) an improved range of motion; (6) less requirement for analgesics; and (7) a durable, well-aligned, highly functional knee. With the ongoing advancements in surgical technique, medical technology and prosthesis design, knee replacement surgery is constantly evolving. This review provides a personal account of the recent innovations that have been made, with a particular emphasis on the potential use of MIS techniques combined with computer-assisted navigation systems to treat younger, more physically active patients with resurfacing partial/total implant knee arthroplasty

Navegação na artroplastia total do joelho: existe vantagem?

OBJETIVO: Avaliar se a cirurgia auxiliada por navegação oferece vantagens sobre a técnica convencional, foi desenvolvido um estudo randômico, prospectivo e comparativo analisando o posicionamento do implante, alinhamento do membro, tempo de cirurgia, perda sanguínea e reabilitação funcional. MÉTODOS: Foram estudados 39 pacientes submetidos a 42 Artroplastias Totais de Joelho. No grupo 1 (n=21) a cirurgia foi navegada e no grupo 2 (n=21) convencional. Os pacientes foram avaliados com radiografia panorâmica de membros inferiores, tomografia computadorizada e pelo Knee Society Score (KSS) no pré-operatório e com três meses de pós-operatório. O tempo de cirurgia e a perda sanguínea pós-operatória também foram avaliados. RESULTADOS: O tempo de cirurgia foi maior no grupo 1. Não houve diferença significativa quanto à perda sanguínea e ao KSS. Houve maior proximidade dos três graus de rotação externa e dos cinco graus de inclinação coronal nos pacientes do grupo 2. O eixo mecânico aproximou-se mais de zero grau no grupo 1. CONCLUSÕES: A navegação promove um posicionamento individualizado dos componentes da prótese oferecendo vantagens no realinhamento do membro. O tempo cirúrgico tende a ser maior na técnica navegada, porém, não foi estatisticamente significante. Não há diferenças na perda sanguínea e na melhora do KSS. Nivel de Evidência I, estudo terapeutico.OBJECTIVE: Aiming to evaluate whether surgery aided navigation offers any advantages over the conventional technique, a randomized, prospective, comparative study was carried out, analyzing the placement of components, alignment of the limb, surgical time, blood loss and functional rehabilitation. MATERIAL AND METHODS: We studied 39 patients submitted42 Total Knee Arthroplasties. In group 1 (n = 21) the surgery was navigated and in group 2 (n = 21) it was conventional. The patients were evaluated on panoramic radiographs of the lower limbs, CT scan and the Knee Society Score (KSS) preoperatively and three months postoperatively. Surgery time and postoperative blood loss were also evaluated. RESULTS: Surgery time was longer in group 1. There was no significant difference in blood loss and the KSS. There was a greater proximity of the three degrees of external rotation and the five degrees of tilt in the coronal in group 2. The mechanical axis was closer to zero degree in group CONCLUSIONS: Navigation promotes individualizing of the positioning of the components of the prosthesis, and offered advantages in limb realignment, compared with traditional methods. The surgerytime has a tendency to be higher in group 2, but this difference is not statistically significant. There were no differences between the groups in relation to blood loss and improvement in KSS. Level of Evidence: Level I, therapeutic studies

The New Economy and New Business Models

This chapter tackles the definition of New Economy, its main elements and its transformation, a theoretical perspective, the economics of digital information; negligible marginal costs, network externalities and barriers and enablers of business model change. Digital Business Models; origins, concept, guidelines to develop a consensus for the business models and Digital Business Models best practices identified are also outlined. The chapter draws to a close with the key information regarding the main characteristics for E-Business Environment: generic e-Business Strategies, new Strategies for E-Organizations and new Digital Business Models for E-Organizations.2019-2