The Charnley–Hastings bipolar prosthesis in femoral neck fractures —

Análise fluoroscópica da movimentação in vivo do insert na ATJ de plataforma rotatória

“…[4][5][6][7][8] Some issues of importance in the analysis of the rotation of the polyethylene insert aim to evaluate whether this insert would lose its movement (would lock) in the position in which it was placed in the surgery, 7,8 or would be locked in a more biomechanically satisfactory position, [6][7][8][9][10] or individualized for each patient with its biomechanical characteristics. [11][12][13] Bourne et al 1 have already shown the possible benefits of the rotating platform in TKA but, like an old question present in partial bipolar arthroplasties of the hip, 14,15 it would be important to evaluate the mobility/biomechanical impact of the rotating platform (moving or not) in relation to the functional result/gait, as already demonstrated in bipolar hip prostheses. 9,14,15 Dennis quantitatively studied the mobility of the tibial insert in patients up to 2 years into the postoperative period and verified rotation differences between the prosthesis models and the postoperative time, 7,16 which suggests to us that studies with a longer follow-up time are important to evaluate the real maintenance of the insert rotation on the long term and it functional impact.…”

“…[11][12][13] Bourne et al 1 have already shown the possible benefits of the rotating platform in TKA but, like an old question present in partial bipolar arthroplasties of the hip, 14,15 it would be important to evaluate the mobility/biomechanical impact of the rotating platform (moving or not) in relation to the functional result/gait, as already demonstrated in bipolar hip prostheses. 9,14,15 Dennis quantitatively studied the mobility of the tibial insert in patients up to 2 years into the postoperative period and verified rotation differences between the prosthesis models and the postoperative time, 7,16 which suggests to us that studies with a longer follow-up time are important to evaluate the real maintenance of the insert rotation on the long term and it functional impact. The method employed in the study also interferes in the possibilities of quantitative measurement of the rotation of components.…”

A cautionary tale of the Charnley–Hastings bipolar hemiarthroplasty

“…This has been corroborated with motion studies. 4 There have been reports in the literature of a rare complication of interprosthetic dislocation postoperatively. 1,3,9 These were initially reported as faulty prototypes 1 but have subsequently thought to be due to impingement of the prosthesis, trauma or an assembly mistake peri-operatively.…”

Tribology of Hemiarthroplasty

“…This was possibly due to the delayed acetabular wear because the motions are decoupled by the bipolar prosthesis (Gaine et a/., 2000b). Therefore, a novel design of bipolar prosthesis which included a thin metal shell with a metal head was examined in chapter 7.…”

“…wider motion range, better stability, longevity, and less impingements) compared to unipolar devices(V~zquez-Vela and V~zquez-Vela, 1990; Vazquez-Vela et al, 1990;Marcus et al, 1992;Gaine et al, 2000a;Ong et al, 2002;Cantu, 2004;Bhattacharyya and Koval, 2009). Due to the cartilage wear and the developed techniques in hip replacements, unipolar hemiarthroplasty is no longer used in the United States.…”