Influences of fit and fill following hip arthroplasty using a cementless short-stem prosthesis

Abstract

Implanting the Metha prosthesis induces tight fit and fill ratio at the proximal and coated sections. Preoperative femur configuration should be considered to achieve best fit and fill situation and therefore excellent primary stability. In most cases "normal" and "stove-pipe" configurations provide good proximal fit and fill. Since "champagne-flute" configuration induces undesirable tight distal fit and fill ratio the size of the Metha (®) stem should be adequately increased to achieve a more proximal load transmission.

Magnification of digital hip radiographs differs between clinical workplaces

“…Our study supplements previous studies by showing that magnification of hip radiographs depends not only on marker and patient-specific factors [ 7 , 9 , 10 ], but also on clinical workplace or more precisely on radiographic device. It indicates potential limits in generalizability of results of studies dealing with preoperative planning accuracy to other institutions.…”

“…The accuracy of templating has been evaluated with respect to the marker type and position [ 4 , 7 , 8 ], template type (acetate vs. digital) [ 3 ], sex, age, body mass index and Harris Hip Score [ 9 – 11 ]. However, there is limited information whether results from one workplace dealing with certain radiological setup could be quantitatively transferred to another workplace.…”

Long-term clinical and radiographic results of the cementless Spotorno stem in Japanese patients: A more than 15-year follow-up

“…14 According to the canal flare index, the canal shapes were classified as normal (canal flare index ≥3.0–<4.7), stovepipe (canal flare index <3.0), and champagne flute (canal flare index ≥4.7–<6.5). 14,15…”

“…14 According to the canal flare index, the canal shapes were classified as normal (canal flare index 3.0-<4.7), stovepipe (canal flare index <3.0), and champagne flute (canal flare index 4.7-<6.5). 14,15 Radiographic loosening of the femoral stem was identified if any of the following symptoms was presented: (1) radiolucent lines more than 2 mm in thickness were detected around the entire implant on the anteroposterior radiograph; 6 (2) serial radiographs showed a progressive stem subsidence of >5 mm; 6 (3) position of the stem progressively changed with varus or valgus tilt of >5 . 7,16…”

Short Stem for Total Hip Arthroplasty (THA) – Overview, Patient Selection and Perspectives by Using the Metha® Hip Stem System

“…It is thereby essential to achieve a cortical metaphyseal anchoring by choosing a sufficiently large prosthesis. 11 , 12 …”