TITLE

In Vivo Noninvasive Evaluation of Abnormal Patellar Tracking During Squatting in Patients with Patellofemoral Pain

AUTHOR(S)
Wilson, Nicole A.; Press, Joel M.; Koh, Jason L.; Hendrix, Ronald W.; Li-Qun Zhang
PUB. DATE
March 2009
SOURCE
Journal of Bone & Joint Surgery, American Volume;Mar2009, Vol. 91-A Issue 3, p558
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
Background: Patellofemoral pain syndrome is one of the most common knee problems and may be related to abnormal patellar tracking. Our purpose was to compare, in vivo and noninvasively, the patellar tracking patterns in symptomatic patients with patellofemoral pain and those in healthy subjects during squatting. We tested the hypothesis that patients with patellofemoral pain exhibit characteristic patterns of patellar tracking that are different from those of healthy subjects. Methods: Three-dimensional patellar kinematics were recorded in vivo with use of a custom-molded patellar clamp and an optoelectronic motion capture system in ten healthy subjects and nine subjects with patellofemoral pain. The position of osseous knee landmarks was digitized while subjects stood upright, and then patellofemoral kinematics were recorded during squatting. The tracking technique was validated with use of both in vitro and in vivo methodologies, and the average absolute error was <1.2° and <1.1 mm. Results: At 90° of knee flexion, the patella showed lateral spin (the distal pole of the patella rotated laterally) in subjects with patellofemoral pain (mean and standard deviation, -10.13° ± 2.24°) and medial spin in healthy subjects (mean, 4.71° ± 1.17°) (p < 0.001). At 90° of knee flexion, the patella demonstrated significantly more lateral translation in subjects with patellofemoral pain (mean, 5.05 ± 3.73 mm) than in healthy subjects (mean, -4.93 ± 3.93 mm) (p < 0.001). Conclusions: Kinematic differences between healthy subjects and subjects with patellofemoral pain were demonstrated through a large, dynamic range of knee flexion angles. Increased lateral patellar translation and lateral patellar spin in subjects with patellofemoral pain suggest that the patella is not adequately balanced during functional activities in this group. Prospective studies are needed to identify when patellofemoral pain-related changes begin to occur and to determine the risk for the development of patellofemoral pain in individuals with abnormal kinematics. Clinical Relevance: This study presents a simple extension of standard motion analysis tools, which allows for accurate assessment of three-dimensional patellofemoral kinematics in the clinical setting. The identification of kinematic differences associated with patellofemoral pain suggests that the dynamic tracking technique is a potential diagnostic tool for this syndrome.
ACCESSION #
37011888

 

Related Articles

Share

Read the Article

Courtesy of VIRGINIA BEACH PUBLIC LIBRARY AND SYSTEM

Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics