The purpose of this update is to report on a variety of topics related to trapezium implants that have been investigated during the past three years. The keyword trapezium implant was utilized to query the PubMed database of the U.S. National Library of Medicine. From the resulting list, papers published from the beginning of January 2012 through the beginning of April 2015 were reviewed. The t...

BACKGROUND AND PURPOSE There have been few reports on the long-term outcome of ankle replacements. The Norwegian Arthroplasty Register has been registering ankle replacements since 1994, but no analysis of these data has been published to date. Here we report data on the use of total ankle replacements and the revision rate in the Norwegian population over a 12-year period. METHODS We used th...

BACKGROUND Cemented total hip arthroplasty has been the treatment of choice for elderly patients with osteoarthritis. We analyzed survival rates of the most common cementless designs used in this age group in Finland. PATIENTS AND METHODS Inclusion criteria permitted 10,310 replacements (8 designs) performed in patients aged 55 years or older to be selected for evaluation. The risk of revisio...

Mobile-bearing posterior-stabilised knee replacements have been developed as an alternative to the standard fixed- and mobile-bearing designs. However, little is known about the in vivo kinematics of this new group of implants. We investigated 31 patients who had undergone a total knee replacement with a similar prosthetic design but with three different options: fixed-bearing posterior cruciat...

This paper proposes random age, periodic and block replacement policies which are made at random variable times, and optimal policies that minimize their expected cost rates are discussed analytically and computed numerically. We compare such random replacements with their standard policies that are made at constant times. Comparison results show that when costs for random and constant replacem...

OBJECTIVES To estimate the requirement for total hip replacement in the United Kingdom over the next three decades METHODS Projection of age and sex specific hip replacements in the UK over 10 year intervals taking account of demographic change and the extrapolation of arthroplasty rates from Sweden; a country with recently introduced guidelines. RESULTS Assuming no change in the age and se...

The estimation of the amount of evolutionary divergence that has taken place between two DNA coding sequences depends strongly on the degree of constraint on amino acid replacements. If amino acid replacements are relatively unconstrained, the individual nucleotide is the appropriate unit of analysis and the method of Tajima and Nei can be used. If amino acid replacements are constrained, howev...