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Utility of the frontal plane projection angle in females with patellofemoral pain.
J Orthop Sports Phys Ther 2008; 38(10):606-15JO

Abstract

STUDY DESIGN

Case-control study of females with patellofemoral pain syndrome (PFPS) and a control group.

OBJECTIVES

Three different approaches were used to examine the utility of a 2-dimensional (2-D) frontal plane projection angle (FPPA) measure of knee alignment. First, we measured the FPPA association with respect to 3-dimensional (3-D) lower extremity joint rotations during single-leg squats. Second, we determined the correlation of the FPPA during single-leg squats with hip and knee joint rotations during running and single leg jumping. Third, we compared the FPPA between females with and without PFPS.

BACKGROUND

PFPS is associated with altered lower extremity kinematics during weight-bearing activities that decrease retropatellar contact area and increase retropatellar stress. An objective and simple procedure to quantify altered kinematics during weight-bearing activities may help clinicians identify individuals who may likely benefit from interventions to improve lower extremity kinematics.

METHODS AND MEASURES

Twenty females with PFPS and 20 healthy female controls performed single-leg squats, running, and repetitive single-leg jumps while 3-D lower extremity kinematics were recorded. The FPPA was recorded by a digital camera during single-leg stance and single-leg squats. Correlation coefficients were used to quantify the association between the FPPA and transverse and frontal plane hip and knee angles for all activities. Independent t tests were used to compare FPPA values between groups.

RESULTS

FPPA values representing medial displacement of the knee during single-leg squats were associated with increased hip adduction (r = 0.32 to 0.38, P<.044) and knee external rotation (r = 0.48 to 0.55, P<.001) across activities. FPPA values for the PFPS group reveal greater medial displacement of the knee compared with those of the control group during single-leg squats (P = .012).

CONCLUSION

The association between the FPPA and lower extremity kinematics that are associated with PFPS suggest that the FPPA during single-leg squats may be a useful clinical measure. However, these methods should not be used to quantify 3-D joint rotations.

Authors+Show Affiliations

University of Wisconsin-La Crosse, Physical Therapy Program, La Crosse, WI 54601, USA. jdwillson@yahoo.comNo affiliation info available

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

18827327

Citation

Willson, John D., and Irene S. Davis. "Utility of the Frontal Plane Projection Angle in Females With Patellofemoral Pain." The Journal of Orthopaedic and Sports Physical Therapy, vol. 38, no. 10, 2008, pp. 606-15.
Willson JD, Davis IS. Utility of the frontal plane projection angle in females with patellofemoral pain. J Orthop Sports Phys Ther. 2008;38(10):606-15.
Willson, J. D., & Davis, I. S. (2008). Utility of the frontal plane projection angle in females with patellofemoral pain. The Journal of Orthopaedic and Sports Physical Therapy, 38(10), pp. 606-15. doi:10.2519/jospt.2008.2706.
Willson JD, Davis IS. Utility of the Frontal Plane Projection Angle in Females With Patellofemoral Pain. J Orthop Sports Phys Ther. 2008;38(10):606-15. PubMed PMID: 18827327.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Utility of the frontal plane projection angle in females with patellofemoral pain. AU - Willson,John D, AU - Davis,Irene S, PY - 2008/10/2/pubmed PY - 2008/11/19/medline PY - 2008/10/2/entrez SP - 606 EP - 15 JF - The Journal of orthopaedic and sports physical therapy JO - J Orthop Sports Phys Ther VL - 38 IS - 10 N2 - STUDY DESIGN: Case-control study of females with patellofemoral pain syndrome (PFPS) and a control group. OBJECTIVES: Three different approaches were used to examine the utility of a 2-dimensional (2-D) frontal plane projection angle (FPPA) measure of knee alignment. First, we measured the FPPA association with respect to 3-dimensional (3-D) lower extremity joint rotations during single-leg squats. Second, we determined the correlation of the FPPA during single-leg squats with hip and knee joint rotations during running and single leg jumping. Third, we compared the FPPA between females with and without PFPS. BACKGROUND: PFPS is associated with altered lower extremity kinematics during weight-bearing activities that decrease retropatellar contact area and increase retropatellar stress. An objective and simple procedure to quantify altered kinematics during weight-bearing activities may help clinicians identify individuals who may likely benefit from interventions to improve lower extremity kinematics. METHODS AND MEASURES: Twenty females with PFPS and 20 healthy female controls performed single-leg squats, running, and repetitive single-leg jumps while 3-D lower extremity kinematics were recorded. The FPPA was recorded by a digital camera during single-leg stance and single-leg squats. Correlation coefficients were used to quantify the association between the FPPA and transverse and frontal plane hip and knee angles for all activities. Independent t tests were used to compare FPPA values between groups. RESULTS: FPPA values representing medial displacement of the knee during single-leg squats were associated with increased hip adduction (r = 0.32 to 0.38, P<.044) and knee external rotation (r = 0.48 to 0.55, P<.001) across activities. FPPA values for the PFPS group reveal greater medial displacement of the knee compared with those of the control group during single-leg squats (P = .012). CONCLUSION: The association between the FPPA and lower extremity kinematics that are associated with PFPS suggest that the FPPA during single-leg squats may be a useful clinical measure. However, these methods should not be used to quantify 3-D joint rotations. SN - 0190-6011 UR - https://www.unboundmedicine.com/medline/citation/18827327/Utility_of_the_frontal_plane_projection_angle_in_females_with_patellofemoral_pain_ L2 - http://www.jospt.org/doi/full/10.2519/jospt.2008.2706?url_ver=Z39.88-2003&amp;rfr_id=ori:rid:crossref.org&amp;rfr_dat=cr_pub=pubmed DB - PRIME DP - Unbound Medicine ER -