Some surgeons warn against kneeling after total knee arthroplasty (TKA), because limited clinical data exist. We describe the tibiofemoral contact position of TKA components during kneeling in vivo. Ten posterior-substituting (PS) and 10 cruciate-retaining (CR) designs were examined using a radiographic image-matching technique. Movement from standing to kneeling at 90° produced different responses. CR knees translated anteriorly (medial, 4 ± 4 mm; lateral, 2 ± 6 mm). PS knees underwent little posterior translation (medial, 0.2 ± 3 mm; lateral, 1 ± 4 mm). Movement from 90° to maximum flexion produced femoral posterior translation (CR medial, 5 ± 4 mm; CR lateral, 5 ± 4 mm; PS medial, 6 ± 4 mm; PS lateral, 6 ± 3 mm). The relationship between tibiofemoral contact position and flexion angle was more variable for CR (r2=.38) than for PS (r 2=.64). Knee kinematics was similar to other deep-flexion weight-bearing activities.
- total knee arthroplasty
ASJC Scopus subject areas
- Orthopedics and Sports Medicine