Twenty-year evaluation of meniscal bearing and rotating platform knee replacements

Clinical results of the initial cemented and cementless series of 373 New J ersey Low Contact Stress total knee replacements in 282 patients surviving at least 10 years were analyzed using a strict knee scoring scale, The stud y showed excellent, good, fair, or poor results in 68.1 %, 29.8 %, 2.1 %, o r 0 % of primary posterior cruciate-retaining meniscal bearing knee replace ments, 46.7 %, 53.3 %, 0 %, or 0 % results in primary cemented rotating pla tform knee replacements, and 68.1 %, 29.8 %, 2.1 %, or 0 % results in prima ry cementless rotating platform knee replacements, respectively. Radiograph ic evaluation at minimum 10-year followup showed stable fixation of all com ponents, no gross migration but significant osteolysis requiring bearing ex change and bone grafting in three cementless rotating platform knee replace ments (1.8 %) in three patients who underwent previous surgeries at an aver age of 10.2 years from the index surgery. Survivorship of the patients who underwent primary cementless posterior cruciate-retaining meniscal bearing knee replacements with an end point of revision for any mechanical reason w as 97.4 % at 10 years and 83 % at 16 years; using an end point of a poor cl inical knee score the survivorship was 98.9 % at 10 years and at 16 years. Survivorship of the patients who underwent primary cemented rotating platfo rm knee replacements with end points of revision for any mechanical reason or a poor clinical knee score was 97.7 % at 10 years and at 20 years. Survi vorship of the patients who underwent cementless rotating platform knee rep lacements with end points of revision for any mechanical reason or a poor c linical knee score was 98.3 % at 10 years and at 18 years.