Cementless cups do not increase osteolysis risk in metal-on-metal total hip arthroplasty. Apropos of 106 cases.

Background: Metal-on-metal bearings in total hip arthroplasty (THA) were introduced to reduce the production of wear debris and debris-induced periprosthetic osteolysis. Analysis of various series according to the type of selected acetabular fixation highlights different evolutions: favourable results with uncemented cups contrasting with loosening and radiolucent lines (RLL) evolution for cemented cups.

Hypothesis: Combining metal-on-metal bearings to uncemented cups does not increase the osteolysis risk at a minimum 5 years' follow-up.

Does lateral versus medial exposure influence total knee tibial component final external rotation? A CT based study.

Introduction: A previous study demonstrated that performing a total knee arthroplasty through a lateral approach including anterior tibial tuberosity (ATT) osteotomy (refixed in its original position) presented numerous advantages: correcting the preoperative patella lateral tilt and improving postoperative patella tracking. We hypothesized that these improvements in patella centering were, at least in part, due to an increased external rotation of the tibial component. Postoperative scannographic studies were, therefore, undertaken to measure tibial component rotation and analyze the results according the medial and lateral exposure used.

Distal femur rotational alignment and patellar subluxation: a CT scan in vivo assessment.

Background: Patellofemoral instability following total knee arthroplasty is a very common complication which may result from a defective rotational positioning of the femoral component. However, rotational landmarks for optimal orientation are not unequivocal. Moreover, no proven correlation has yet been established between preexisting rotational malposition and patellofemoral instability occurrence.