Industry based evidence synthesis

In 2017, me and colleagues published both a literature and registry based analysis of use of metal-on-metal hip replacements. This study, titled Lack of evidence—the anti-stepwise introduction of metal-on-metal hip replacements, was a hypothesis-driven study since at that time it seemed that the use of ASR hip replacements was not that evidence based but mainly […]

Declining incidence of MoM revision surgeries

Our recent study investigating annual trends of revision surgeries in patients with MoM hip replacements was recently published in the Journal of Arthroplasty (www). Here is the GrAbstract of the study: This study is of great importance because it is the largest non-registry based study investigating what sort of trends the number of revision surgeries […]

Post-hoc power – Alone in the universe

Prologue Firstly, it is important to describe what post-hoc power really means. Post-hoc power is the power of the test using effect size observed and sample size used in the study. For this reason post-hoc power is often labeled as observed power. If for any experiment the effect size, parameter estimates and sample size is […]

Metal-on-metal hips on the Gartner Hype Cycle

This post describes an adaptation of Gartner Hype Cycle on metal-on-metal hip replacements. It is very unlikely that MoM hip replacements will achieve the “Plateau of Productivity“. Therefore two other later stages are proposed with annotations. Reference 1. Harris WH. Osteolysis and particle disease in hip replacement. A review. Acta Orthop Scand. 1994 Feb;65(1):113-23. 2. […]

Increasing incidence of quadriceps tendon rupture

Our study about increasing incidence of surgically treated quadriceps tendon ruptures was just published in the Knee Surgery, Sports Traumatology, Arthroscopy. At this moment it is in Open Access format so full-text is freely available. Below is the grabstract, ie. graphical abstract, of our study. In our study we write “There is no evidence of […]

A little prediction

A week ago Mortensen et al. published a study protocol investigating medial unicompartmental versus total knee arthroplasty for anteromedial tibio-femoral osteoarthritis. This study setting is very interesting. Both total knee replacement (TKR) and unicompartmental knee replacement (UKR) can be used to treat medial sided knee osteoarthritis. Mortensen et al. nicely sum up both pros and […]