Blood analysis for trace metals in metal-on-metal, ceramic-on-ceramic and metal-on-cross-linked PE bearings in total hip arthroplasty.

We obtained postoperative blood concentrations of Co, Cr, Mo, Ti, Al and Nb in 75 patients undergoing primary THA at our institution between January 1998 and December 2000. All patients were treated with the same prosthetic device (Alloclassic VARIALLTM, Zimmer, Winterthur, Switzerland) using three types of articulations: metal-on-metal (METASULTM ), ceramic-on-ceramic (CERASULTM) and metal-on-cross linked polyethylene (DURASULTM). 25 patients out of each articulation-group were evaluated by blood analysis 24-38 months after surgery.

Tribological considerations for a new hip system.

Purpose Of The Study: This paper was initiated to evaluate a new total hip system based on cementless fixation and focusing options for different articulations within a single hip system.

Material And Methods: 100 patients provided with the cementless Variall hip system were evaluated clinically and radiographically. The 59 female and 41 male patients were followed for a minimum of 3 years postoperative.

[Risk factors for dislocation of a cementless total hip endoprosthesis--a statistical analysis].

Aim: This retrospective study aimed at the statistical identification of risk factors for dislocation for a certain cementless hip endoprothesis.

Material And Method: At our department 2605 primary total hip arthroplasties were performed between 1987 and 1997. In 40 patients (1.