Femoral component collar and calcar contact during total hip arthroplasty: gap incidence, subsidence, and biomechanical testing - a scoping review
In recent years collared femoral stems have been increasingly utilized in total hip arthroplasty (THA) for their ability to improve rotational stability, metaphyseal load transfer, and prevent periprosthetic femoral fracture (PFF). While literature has demonstrated their benefit over collarless stems, the clinical and biomechanical implications of a postoperative collar–calcar gap (CCG) after implantation remain incompletely understood. The purpose of this scoping review was to evaluate existing literature around CCG in primary THA.
Will knee injections help your osteoarthritis? Here's what the evidence says
Knee osteoarthritis is a complex disease that affects the whole joint, including bone, cartilage, ligaments and muscles. When pain persists, many people look for quick, convenient options, such as injections. Clinics offer several types of knee injections. Some are heavily marketed with promises to "repair" or "regenerate" the joint. But what does the evidence actually say about these claims, or the ability of knee injections to reduce pain and improve mobility?





