Article

Patellar malalignment is a major cause of patellofemoral pain syndrome
(PFPS), but the relationship between clinical symptoms and changes in patellar
position and knee muscle strength has not been confirmed. This study examined the
effect of weight training on hip and knee muscle strength, patellofemoral joint
contact area, and patellar tilt on subjects with and without PFPS, hoping to
develop an optimal rehabilitation protocol for subjects with PFPS. The
study uses a prospective independent group comparison. Fifteen subjects with and
without PFPS were assessed for knee strength, patellofemoral joint contact area,
and patellar tilt angle using magnetic resonance imaging. The subjects with PFPS
were also examined and given a numeric pain rating score and a Kujala
patellofemoral score. The subjects performed lower-limb weight training 3
times/wk for 8 wks, and the outcomes were assessed both before and after
training. RESULTS: Subjects with PFPS have increased their patellofemoral joint
contact area after weight training (P < 0.001). No statistical significant change
was found on the patellar tilt angle. The isometric and isokinetic knee strength
in subjects with and without PFPS have increased after weight training (P value
increased from 0.007 to 0.05). Both numeric pain rating and Kujala patellofemoral
score in the PFPS group improved after training (P < 0.001). CONCLUSIONS:
Weight-training exercise increased knee muscle strength and the patellofemoral
joint contact area, which could reduce mechanical stress in the joint, improving
pain and function in subjects with PFPS.

Langue : ANGLAIS