Eliane de Morais Machado1, Fabrício Rapello1, Juliana M Ocarino2, Sérgio T Fonseca2, Luciana De Michelis Mendonça3. 1. Postgraduate Program in Physical Therapy, Universidade Federal de São Carlos (UFSCar), São Carlos, SP, Brazil. 2. Physical Therapy Department, Universidade Federal de Minas Gerais (UFMG), Belo Horizonte, MG, Brazil. 3. Postgraduate Program in Physical Therapy, Universidade Federal de São Carlos (UFSCar), São Carlos, SP, Brazil; Physical Therapy Department, Universidade Federal de Minas Gerais (UFMG), Belo Horizonte, MG, Brazil. Electronic address: lucianademichelis@yahoo.com.br.
Abstract
BACKGROUND: Alterations of frontal plane patellar alignment could be related to lower limb disorders. Clinical assessment must be able to identify the influence of non-local factors in patellar alignment. OBJECTIVE: To identify the influence of lower limb torque, range of motion (ROM), and foot alignment on patellar rotation in healthy athletes. METHODS: This cross-sectional study was performed with 232 healthy basketball and volleyball elite athletes. Participants were assessed in preseason for: patellar medial and lateral rotation (Arno angle), passive hip internal rotation (IR) ROM, iliotibial band flexibility, hip abductors and external rotators (ER) torque, shank-forefoot alignment (SFA), and ankle dorsiflexion ROM. Hierarchical multiple linear regression was performed to identify if these variables and sex, age, and body mass could be associated with patellar rotation in a standing position. RESULTS: Hip ER isometric torque explained a small part (10%) of the variance of the Arno angle in healthy athletes (R² change=0.10; unstandardized ß=11.74 (95% CI 6.82, 16.65); Standardized Coefficient Beta=0.32) and sex explained 2% of its variance (R² change=0.02; unstandardized ß= 2.42 (95% CI 0.32, 4.52); Standardized Coefficient Beta=0.15). After controlling for sex, hip ER torque explained 9% of Arno angle variance (R² change=0.09; unstandardized ß= 11.09 (95% CI 6.43, 15.76; Standardized Coefficient Beta=0.31). The other variables were not associated with patellar rotation. CONCLUSIONS: Hip ER torque may influence patellar rotation in different directions (medial or lateral rotation). Possible mechanisms that explain the contribution of higher and lower hip ER torque in lateral and medial patellar rotation, respectively, are discussed.
BACKGROUND: Alterations of frontal plane patellar alignment could be related to lower limb disorders. Clinical assessment must be able to identify the influence of non-local factors in patellar alignment. OBJECTIVE: To identify the influence of lower limb torque, range of motion (ROM), and foot alignment on patellar rotation in healthy athletes. METHODS: This cross-sectional study was performed with 232 healthy basketball and volleyball elite athletes. Participants were assessed in preseason for: patellar medial and lateral rotation (Arno angle), passive hip internal rotation (IR) ROM, iliotibial band flexibility, hip abductors and external rotators (ER) torque, shank-forefoot alignment (SFA), and ankle dorsiflexion ROM. Hierarchical multiple linear regression was performed to identify if these variables and sex, age, and body mass could be associated with patellar rotation in a standing position. RESULTS: Hip ER isometric torque explained a small part (10%) of the variance of the Arno angle in healthy athletes (R² change=0.10; unstandardized ß=11.74 (95% CI 6.82, 16.65); Standardized Coefficient Beta=0.32) and sex explained 2% of its variance (R² change=0.02; unstandardized ß= 2.42 (95% CI 0.32, 4.52); Standardized Coefficient Beta=0.15). After controlling for sex, hip ER torque explained 9% of Arno angle variance (R² change=0.09; unstandardized ß= 11.09 (95% CI 6.43, 15.76; Standardized Coefficient Beta=0.31). The other variables were not associated with patellar rotation. CONCLUSIONS: Hip ER torque may influence patellar rotation in different directions (medial or lateral rotation). Possible mechanisms that explain the contribution of higher and lower hip ER torque in lateral and medial patellar rotation, respectively, are discussed.
Authors: Rodrigo Scattone Silva; Theresa H Nakagawa; Ana Luisa G Ferreira; Luccas C Garcia; José E M Santos; Fábio V Serrão Journal: Phys Ther Sport Date: 2015-12-19 Impact factor: 2.365
Authors: Luciana D Mendonça; Evert Verhagen; Natália F N Bittencourt; Gabriela G P Gonçalves; Juliana M Ocarino; Sérgio T Fonseca Journal: J Sci Med Sport Date: 2015-06-05 Impact factor: 4.319