International trends in rigid contact lens prescribing (2000-2023): An update.

PURPOSE: Rigid contact lenses have an important role in contact lens practice. The purpose of this work is to update earlier surveys by describing global trends in rigid lens fitting between 2000-2023. METHOD: An annual contact lens prescribing survey was sent to eye care practitioners in up to 71 countries between 2000 and 2023. Data relating to 342,500 fits undertaken in 20 countries returning reliable longitudinal data were analysed in respect of rigid lens fitting, defined as the fitting of any design of a contact lens manufactured in a rigid material. RESULTS: Overall, rigid lens prescribing increased slightly over time, from 14.2 % of lens fits in 2000 to 15.2 % in 2023 (p < 0.0001). However, post-hoc analysis shows that the change over time is best described as a decline between 2000 and 2012, followed by a steady increase subsequently. There were significant differences in rigid lens prescribing between countries (p < 0.0001). The difference between the percentage of males fitted with rigid lenses, as a proportion of all contact lenses (12.7 %), and females (12.0 %) is significant (p < 0.0001), although not clinically meaningful. Rigid lens wearers are older at fitting than soft lens wearers (38.7 vs 31.3 years, respectively) (p < 0.0001). Analysis of 5,994 rigid lens fits prescribed currently (2019-2023) were categorised as: corneal sphere - 30 %; scleral and corneo-scleral - 28 %; corneal myopia control/orthokeratology - 21 %; and corneal complex (including toric, multifocal and monovision) - 16 %. CONCLUSION: There has been a slight increase in rigid lens fitting during the second decade of this century. This increase is apparently due to a 'repurposing' of rigid lenses, with the growth of scleral/corneo-scleral and myopia control/orthokeratology lens fits essentially replacing conventional spherical corneal lens fits.

Major lower extremity amputations in a developing country: 10-Year experience at a tertiary medical center.

BACKGROUND: Lower extremity amputation (LEA) is a major surgical procedure with a high risk of significant morbidity and mortality. The objective of this study was to describe mortality and functionality outcomes following this procedure in a developing country. METHODS: This is a retrospective study of all patients undergoing LEA for non-traumatic etiology between 2007 and 2017. Medical records were used to retrieve demographics, comorbidities, and perioperative complications of identified patients. Patients were contacted to follow-up on their medical, postoperative care, and ambulatory status. Mortality and postoperative functionality rates were analyzed. RESULTS: The study included 78 patients. Median follow-up duration was 24 months. Hypertension (81%) and diabetes (79%) were the most common comorbidities. Mortality rates at 30 days, 1, and 5 years were 10.3, 29.2, and 65.5%, respectively. Mortality was significantly associated with age > 70 at amputation (p = 0.042), hypertension (p = 0.003), chronic kidney disease (p = 0.031), and perioperative sepsis (p = 0.01). Only 1.6% of patients were discharged into a specialized care center, and only 27% of patients were ambulatory postoperatively, although 90.5% were fitted with a prosthesis. CONCLUSIONS: Survival following major amputation in a developing country is currently comparable to more developed regions of the world. Major discrepancy seems to exist in ambulatory status following the procedure. Discharge placement policies should be properly set, and rehabilitation centers funding should be increased. Awareness may also be warranted to educate patients and families about the value and positive impact of rehabilitation centers.

Lower limb prosthetic interfaces: Clinical and technological advancement and potential future direction.

The human-prosthesis interface is one of the most complicated challenges facing the field of prosthetics, despite substantive investments in research and development by researchers and clinicians around the world. The journal of the International Society for Prosthetics and Orthotics, Prosthetics and Orthotics International, has contributed substantively to the growing body of knowledge on this topic. In celebrating the 50th anniversary of the International Society for Prosthetics and Orthotics, this narrative review aims to explore how human-prosthesis interfaces have changed over the last five decades; how research has contributed to an understanding of interface mechanics; how clinical practice has been informed as a result; and what might be potential future directions. Studies reporting on comparison, design, manufacturing and evaluation of lower limb prosthetic sockets, and osseointegration were considered. This review demonstrates that, over the last 50 years, clinical research has improved our understanding of socket designs and their effects; however, high-quality research is still needed. In particular, there have been advances in the development of volume and thermal control mechanisms with a few designs having the potential for clinical application. Similarly, advances in sensing technology, soft tissue quantification techniques, computing technology, and additive manufacturing are moving towards enabling automated, data-driven manufacturing of sockets. In people who are unable to use a prosthetic socket, osseointegration provides a functional solution not available 50 years ago. Furthermore, osseointegration has the potential to facilitate neuromuscular integration. Despite these advances, further improvement in mechanical features of implants, and infection control and prevention are needed.

International survey of contact lens fitting for myopia control in children.

PURPOSE: To determine the extent of contact lens fitting for myopia control (MC) in children (defined as ≤ 17 years of age) worldwide and to characterize the associated demographics and fitting patterns. METHODS: Survey forms were sent to contact lens fitters in 66 countries between January and March every year for eight consecutive years (2011-2018, inclusive). Practitioners were asked to record data relating to the first 10 contact lens fits performed after receiving the survey form. Data were analysed for those countries reporting ≥ 100 contact lens fits to children. RESULTS: Data were analysed for 535 MC fits and 23,295 other (non-MC) lens fits undertaken in 31 countries reporting ≥ 100 contact lens fits to children, with 52.1% of MC fits and 12.0% of non-MC fits being with rigid lenses (p < 0.0001). Overall, MC lenses represented 2.3% of all contact lens fits to children, with significant differences between nations (p < 0.0001), ranging from no MC fits recorded in the Czech Republic, Greece, Japan, South Korea and Puerto Rico, to 24.9% in Austria. There has been an increase in contact lens fitting for MC over the survey period (p < 0.0001). MC contact lenses were fitted to younger children compared to non-MC lenses (MC, median 13 years vs. non-MC, median 15 years) (p < 0.0001). There was no sex bias in the fitting of MC lenses (p = 0.89). CONCLUSIONS: MC lenses are currently being prescribed for younger children in equal measure in terms of soft vs. rigid lenses and males vs. females. The extent of MC fitting is low and varies between nations. The gradual increase in MC fitting throughout the survey period perhaps reflects growing concerns among practitioners over the myopia epidemic.

Meeting the Best Practice for Hearing Aid Verification in Children: Challenges and Future Directions.

Purpose This study examined the current pediatric amplification practice with an emphasis on hearing aid verification using probe microphone measurement (PMM), among audiologists in Klang Valley, Malaysia. Frequency of practice, access to PMM system, practiced protocols, barriers, and perception toward the benefits of PMM were identified through a survey. Method A questionnaire was distributed to and filled in by the audiologists who provided pediatric amplification service in Klang Valley, Malaysia. One hundred eight (N = 108) audiologists, composed of 90.3% women and 9.7% men (age range: 23-48 years), participated in the survey. Results PMM was not a clinical routine practiced by a majority of the audiologists, despite its recognition as the best clinical practice that should be incorporated into protocols for fitting hearing aids in children. Variations in practice existed warranting further steps to improve the current practice for children with hearing impairment. The lack of access to PMM equipment was 1 major barrier for the audiologists to practice real-ear verification. Practitioners' characteristics such as time constraints, low confidence, and knowledge levels were also identified as barriers that impede the uptake of the evidence-based practice. Conclusions The implementation of PMM in clinical practice remains a challenge to the audiology profession. A knowledge-transfer approach that takes into consideration the barriers and involves effective collaboration or engagement between the knowledge providers and potential stakeholders is required to promote the clinical application of evidence-based best practice.

Assessment of a practitioner's perception of scleral contact lens complications.

PURPOSE: The purpose of this survey was to better understand scleral lens (SL) practitioners' fitting preferences and minor SL complications and their subsequent treatments. METHOD: Practitioners who attended the 2017 Global Specialty Lens Symposium were asked to complete an electronic questionnaire that was created by the investigators, a survey that asked practitioners about their SL fitting experience and preferences, their patients' experience with poor SL wetting, SL fogging, ocular symptoms (redness, pain/discomfort, dryness), and blurred central and side vision, and how the practitioners treated these conditions. RESULTS: This study analyzed data from 164 SL practitioners. The practitioners had been in practice for 16.3 ± 13.4 years, had been fitting SL for 5.5 ± 5.0 years, and fit 7.4 ± 7.1 SL/month. Practitioners preferred a SL with a final central corneal clearance of ∼200 µm and an overall diameter between 15.1 mm to 16.5 mm. Poor SL wetting (90.8% of practitioners documented condition), SL fogging (84.8%), blurred central vision (40.2%), ocular redness (34.8%), ocular dryness (24.4%), ocular pain/discomfort (20.7%), and blurred side vision (12.8%) were encountered by the practitioners. Practitioners preferred treating poor wetting and fogging with lens removal, cleaning, and reapplication, blurred central vision with a lens power change, blurred side (peripheral) vision, ocular redness, and ocular pain with a lens parameter change, and dryness with artificial tears. CONCLUSIONS: Most SL practitioners preferred a SL central corneal clearance of ∼200 µm, and they occasionally encountered SL-related complications in their practice, which they treated similarly to corneal gas permeable CLs.

A sixteen year survey of Canadian contact lens prescribing.

PURPOSE: To understand long-term contact lens prescribing habits of Canadian optometrists. METHODS: One thousand optometrists were surveyed annually from 2000 to 2015. Information was requested on the first ten patients examined after receiving the survey. RESULTS: Over the 16-year survey period, 1987 optometrists provided information on 19,143 patients. Mean age of the patients was 32.7±14.4years. Ratio of females to males was 2:1, the ratio of new fits to refits was 2:3. Soft contact lenses represented 94.5% of all fits. Rigid lenses were more often used as a refit compared to a new fit. Over the 16 years, market share for silicone hydrogel materials grew from 0% to 69.6%, mid-water content materials declined from 75.7% to 14.1%. The multifocal market share grew at the expense of spherical designs, with no change in toric lens fitting. Monthly soft lens replacement remained the preferred option at 48.2%, followed by daily disposable at 40.8%; two-weekly replacement declined to less than10% of patients by 2015. Extended wear was likely used to refit and only to a small proportion of wearers, representing 2.6% of SCL by 2015. The lens care system of choice throughout the period was multipurpose solutions, although the proportion for peroxide systems more than doubled by 2015 from 9.6%, to 21.1%. CONCLUSIONS: Over the 16-year period, SCL material preference changed to silicone hydrogels with monthly replacement being preferred; daily disposables replacing 2-weekly as the alternate. Lens care preference continued to be multipurpose solutions. Rigid lenses appear to be sustained for specialist fitting.

Radiology's Emerging Role in 3-D Printing Applications in Health Care.

From its inception as a tool for prototype development in the early 1980s, three-dimensional (3-D) printing has made inroads into almost every sector of industry, including health care. Medical applications range from extra- and intracorporeal orthopedic devices to complex, temporal reconstructions of patient-specific anatomy that allow operative planning and education. In the contemporary climate of personalized medicine, the utility of tangible 3-D models extrapolated directly from patient imaging data seems boundless. The purpose of this review is to briefly outline the development of 3-D printing, discuss its applications across the many medical and surgical specialties, and attempt to address obstacles and opportunities facing radiology as this technology continues to be integrated into patient care.

[Evolution of total knee arthroplasty. From robotics and navigation to patient-specific instruments]. / Entwicklung der Knieendoprothetik. Von der Robotik über die Navigation zu den patientenspezifischen Instrumenten.

In this article the evolution beginning with the robotics of total knee arthroplasty to CT-based and kinematic navigation and patient-specific instruments is described. Thereby it is pointed out that in the early 1990s, CT imaging solely for the planning of a knee endoprosthesis was considered as obsolete radiation exposure and this led to the widespread development of kinematical systems.Also a patient specific planning tool based on CAD built acryl harz blocs existed at the time. There is an ongoing process of implanting total knee arthroplasties in a more exact position. Nowadays the new evolution of soft tissue balancing by using a kinematic alignment has put these efforts into perspective.

Checagem dos modelos precisos na Implantodontia através do “Index de resina” / Using the “resin Index” to check the accuracy of the plaster model in implantology

A perfeita adaptação passiva das próteses sobre implantes é um fator importante para a obtenção do sucesso na Implantodontia. Para tanto, a eliminação de variáveis que possam afetar o processo de confecção de uma estrutura protética é fundamental, essas vão desde o procedimento de moldagem até a execução da peça protética, sendo que essa fase representa a transição da situação clínica para a fase laboratorial; desta maneira, o modelo de trabalho deve ser o mais preciso possível para evitar qualquer tipo de diferença significativa na adaptação final do trabalho. A confecção, em boca, do “Index de resina” é para auxiliar a conferencia dessa precisão de adaptação no modelo de gesso, eliminando futuros problemas no assentamento das estruturas, na dissipação das cargas mastigatórias e comprometimento da qualidade final do trabalho. Isto se torna imprescindível quando utilizamos a tecnologia CAD/CAM, pois as estruturassão fresadas em monobloco, onde se obtém uma estrutura única em que o assentamento passivo depende diretamente das informações de posicionamento dos análogos, passadas ao software através do modelo de gesso que foi previamente escaneado.

The perfect passive adaptation of the implant prosthesis is an important factor to achievesuccess in implantology. Therefore, the elimination of variables that can affect the process ofprosthetic construction is critical. These variables range from dental impression technique until the final execution of the implant supported prosthesis. The Prosthetic phase is the transition ofthe clinical situation to the laboratory phase; this way, the working model must be as accurateas possible to avoid any significant difference in the final adaptation of the restoration. Theproduction, in mouth, of the “resin Index” is to assist the conference of the precision fit on thestone model, eliminating future problems in the settlement of structures, dissipation of masticatory loads and commitment of the final quality of work. This becomes more imperative whenwe use the CAD / CAM technology, because the structures are milled in a single block where youget a unique structure in which the liability settlement depends directly on the analog position information, passed to the software through the plaster model that was previously scanned.

[Ocular prosthetics. Fitting, daily use and complications]. / Augenprothetische Versorgung. Anpassung, Handhabung und Komplikationen.

BACKGROUND: Ocular prosthetics make a decisive contribution to the functional, esthetic and psychosomatic rehabilitation of patients after ocular extirpation. OBJECTIVES: This article provides an overview of the fitting, daily care and complications of ocular prosthetics. METHODS: The study comprised a PubMed literature review and own clinical results. RESULTS: Ocular prosthetics made from cryolite glass or perspex can be manufactured and fitted 5-8 weeks after removal of the eye. During this period a conformer is placed within the conjunctival sac in order to prevent scar formation and shrinking of the socket. Artificial eyes can be worn continuously, only interrupted by a short but regular cleaning procedure. Artificial tears and lid hygiene improve the comfort of wearing. Glass prostheses have to be renewed every 1-2 years, while perspex prostheses need to be polished once a year. Complications, such as giant papillary conjunctivitis or blepharoconjunctivitis sicca are facilitated by poor fit, increased age and inappropriate care of the prosthetic device. In the case of socket shrinkage or anophthalmic socket syndrome, surgical interventions are needed to re-enable the use of an artificial eye. CONCLUSION: Adequate fitting, daily care of ocular prosthetics and therapeutic management of associated complications are mandatory for a durable functional, esthetic and psychosomatic rehabilitation after ocular extirpation.

New Socket-Less Prosthesis concept facilitating comfortable and abrasion-free cycling after Van Nes rotationplasty.

BACKGROUND AND AIM: Current leg prostheses in rotationplasty typically feature a thigh cuff, which, in cycling, may cause perspiration problems and friction-related abrasions of the skin. The aim has been to develop a socket-less prosthetic device for persons with a rotationplasty to be able to engage in high-intensity cycling without contracting abrasions. TECHNIQUE: The new device (Socket-Less Rotationplasty Prosthesis for Cycling) features a standard cycling shoe on the rotationplasty foot, replacing the conventional socket and thigh cuff. A reinforced 12-layer carbon fibre frame bolted to the aforementioned shoe, replacing the standard tube, connects to a prosthetic foot and a second cycling shoe. Alignment of the Socket-Less Rotationplasty Prosthesis for Cycling is done both statically and dynamically. DISCUSSION: The Socket-Less Rotationplasty Prosthesis for Cycling is lightweight and more ventilated relative to conventional sockets. All components can be replaced easily. Most important, however, is that the current user now can cycle 135 km on end without skin abrasions. CLINICAL RELEVANCE: The Socket-Less Rotationplasty Prosthesis for Cycling concept enables patients with a leg rotationplasty to engage in high-intensity cycling without contracting skin problems, thereby facilitating clients' participation.

Upper extremity limb loss: functional restoration from prosthesis and targeted reinnervation to transplantation.

For several decades, prosthetic use was the only option to restore function after upper extremity amputation. Recent years have seen advances in the field of prosthetics. Such advances include prosthetic design and function, activity-specific devices, improved aesthetics, and adjunctive surgical procedures to improve both form and function. Targeted reinnervation is one exciting advance that allows for more facile and more intuitive function with prosthetics following proximal amputation. Another remarkable advance that holds great promise in nearly all fields of medicine is the transplantation of composite tissue, such as hand and face transplantation. Hand transplantation holds promise as the ultimate restorative procedure that can provide form, function, and sensation. However, this procedure still comes with a substantial cost in terms of the rehabilitation and toxic immunosuppression and should be limited to carefully selected patients who have failed prosthetic reconstruction. Hand transplantation and prosthetic reconstruction should not be viewed as competing options. Rather, they are two treatment options with different risk/benefit profiles and different indications and, hence vastly different implications.