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Peter Luca DiGiovanni, Xavier Gasparutto, Stéphane Armand, and Didier Hannouche

length difference, and those of the cup and stem such as inclination/anteversion ( 10 , 11 , 12 ). One of these particularly crucial parameters that has received a great deal of research attention is offset. All three definitions of offsets are

Emmanuel Thienpont

condylar offset While restoration of the posterior femoral condylar offset (PCO) is important in TKA as it improves flexion stability and range of movement, 25 , 26 it is difficult during rTKR due to the loss of posterior femoral condylar bone. 27

Giuseppe Solarino, Giovanni Vicenti, Massimiliano Carrozzo, Guglielmo Ottaviani, Biagio Moretti, and Luigi Zagra

restoration of the joint biomechanics by adjusting the femoral version, the lower limb length, the neck-shaft angle and the femoral offset (FO), 4 – 7 defined as the distance from the centre of rotation of the femoral head to a line bisecting the

Filippo Familiari, Jorge Rojas, Mahmut Nedim Doral, Gazi Huri, and Edward G. McFarland

with higher rates of notching caused by mechanical impingement with the arm in adduction. 110 Eccentric glenospheres with an inferior offset and glenoid components with a more lateral offset (bony or metal) can reduce the risk of notching. 112

Ahmed Siddiqi, Timothy Horan, Robert M. Molloy, Michael R. Bloomfield, Preetesh D. Patel, and Nicolas S. Piuzzi

.5 RA-TKA patients had smaller mean differences in posterior condylar offset ratio which has been previously shown to correlate with better joint ROM at one year following surgery. In addition, these patients were less likely to have values outside of

Lisa Renner, Viktor Janz, Carsten Perka, and Georgi I. Wassilew

Introduction The short- and long-term success of primary total hip arthroplasty (THA) is associated with the correct reconstruction of the hip biomechanics. This includes the reconstruction of the rotation centre and offset, the correct

Michael M. Morlock, Robert Hube, Georgi Wassilew, Felix Prange, Gerd Huber, and Carsten Perka

general, i.e. also cobalt–chromium heads on titanium-alloy stems, and to adjust combined offset and leg length intraoperatively. The original taper dimension in THA was ‘14/16’, which refers to a truncated cone of 20 mm length with diameters of 14 mm and

Maria Moralidou, Anna Di Laura, Johann Henckel, Harry Hothi, and Alister J. Hart

technical goals include optimal implant sizing and position as well the restoration of femoral offsets (FO), leg length (LLD) and centre of rotation (COR). 7 – 9 Achieving these can eventually lead to a more accurate surgical procedure 9 with

Rima Nasser and Benjamin Domb

. 1 a) Normal hip clearance. b) Cam type impingement with decreased head/neck offset. The cam enters the joint pushing the labrum aside and causing a shear injury to the chondrolabral junction. c) Pincer type impingement with excessive coverage of

Alexis Nogier, Idriss Tourabaly, Sonia Ramos-Pascual, Jacobus H. Müller, Mo Saffarini, and Cyril Courtin

versatility, as most designs are available in a range of sizes, neck lengths and offsets. Custom femoral stems were introduced for selected THA patients, notably those with major anatomical deformities, 2 , 3 for which off-the-shelf implants would not be