[Muscle strength analysis of patella resurfacing in total knee arthroplasty].
OBJECTIVE
To investigate the influence of patella tracking and thickness for muscle strength after patellar resurfacing in total knee arthroplasty (TKA).


METHODS
Quadriceps muscle strength of 100 cases 134 knees with osteoarthritis were analysed with isokinetic testing and extension lag after patellar resurfacing in TKA. Result was analyzed statistically through T test.


RESULTS
Significant decreasing of quadriceps muscle strength and endurance were detected on mal-patellofemoral tracking (61 +/- 24, P <0.01) and improper position of patella prosthesis (56 +/- 33, P < 0.01). Anterior knee pain with patella resurfacing was mainly associated with mal-patellofemoral tracking.


CONCLUSIONS
Asymptomatic weakness of quadriceps muscle was mainly associated with improper patella thickness.
Liu
Fan
F
Department of Orthopedics, People's Hosptal, Peking Medical University, Beijing, China.
Lü
Hou-Shan
HS
Min
Zhi-Song
ZS