Ceramic-on-ceramic bearing decreases the cumulative long-term risk of dislocation.

Background: It is unclear whether late THA dislocations are related to mechanical impingement or to a biological mechanism that decreases the stability provided by the capsule (eg, inflammation secondary to osteolysis). It is also unknown if alumina-on-alumina bearing couples decrease the risk of late dislocation as a result of the absence of wear and osteolysis.

Question/purposes: We asked (1) whether the cumulative number of dislocations differed with alumina-on-alumina (AL/AL) or alumina-on-polyethylene bearings (AL/PE); (2) whether patient factors (age, sex, and diseases) affect risk of late dislocation; (3) whether mechanical factors (component malposition, penetration resulting from creep and wear) or (4) biologic hip factors at revision (thickness of the capsule, volume of joint fluid removed at surgery, histology) differed with the two bearing couples.

Alumina heads minimize wear and femoral osteolysis progression after isolated simple acetabular revision.

Background: Patients with THA requiring cup revision for acetabular osteolysis may have a stable stem component without loosening. However, it is unclear whether isolated cup revision halts femoral osteolysis progression.

Question/purposes: We asked (1) whether and to what degree osteolysis progresses after isolated acetabular revision with a change of the femoral head and (2) whether an alumina or metal bearing better reduces osteolysis progression and wear with a polyethylene (PE) cup.

High dislocation cumulative risk in THA versus hemiarthroplasty for fractures.

Background: Although not all elderly patients with femoral neck fractures are candidates for THA, active, mentally competent, independent patients achieve the most durable functional scores with THA compared with hemiarthroplasty. However, a relatively high frequency of early or late dislocation could reduce the potential benefits with THA.

Questions/purposes: We asked whether the incidence of first-time, recurrent dislocation, and revision differed in patients with hip fractures having THA or hemiarthroplasty.

[Intramedullary pinning of diaphyseal fractures of both forearm bones in adults: 46 cases].

Purpose Of The Study: The goal when treating shaft fractures of the forearm bones is to obtain good bone healing with good preservation of upper limb function. We report a retrospective (1995-2004) consecutive series of patients aged 32 years on average (range 16 to 92 years) who presented 46 shaft fractures of both forearm bones.

Material And Methods: Using Hackethal's classification by sixths, the fracture involved the 3rd and 4th sixth in 39 cases (84.