Kinematics and Mechanical Properties of Knees following Patellar Replacing and Patellar Retaining Total Knee Arthroplasty

Table 2

Knee tibial tray mechanical properties during the gait cycle.

	Gait cycle (patellar retaining)				Gait cycle (patellar replacement)
	Heel strike	Single limb stance 1	Single limb stance 2	Toe off	Heel strike	Single limb stance 1	Single limb stance 2	Toe off
Flexion angle	4°	16°	6°	8°	4°	16°	6°	8°
Axial force (N)	1531	2482	1636	2434	1531	2482	1636	2434
Peak contact stress (MPa)	13.36	16.35	19.51	24.63	14.39	19.43	22.37	28.07
Stress increment					7.71%	18.84%	14.66%,	13.97%
High stress area	Medial	Medial	Medial and lateral	Medial and lateral	Medial	Medial	Medial and lateral	Medial and lateral