OBJECTIVE: Varus thrust observed during gait has been shown to be associated with a 4-fold increase in the risk of medial knee osteoarthritis (OA) progression. Valgus thrust is believed to be less common than varus thrust; the prevalence of each is uncertain. Racial differences in risk factors may help explain variations in the natural history of knee OA. We undertook this study to determine the frequency of varus and valgus thrust in African Americans and Caucasians and to identify factors associated with thrust presence. METHODS: The Osteoarthritis Initiative cohort includes men and women who have knee OA or are at increased risk of developing it. Trained examiners assessed thrust presence by gait observation. Logistic regression with generalized estimating equations was used to identify factors associated with thrust presence, and odds ratios (ORs) with 95% confidence intervals (95% CIs) were calculated. RESULTS: Compared with Caucasians, African Americans had lower odds of varus thrust, controlling for age, sex, body mass index (BMI), injury, surgery, disease severity, strength, pain, and alignment in persons without knee OA (adjusted OR 0.50 [95% CI 0.36, 0.72]) and in those with knee OA (adjusted OR 0.46 [95% CI 0.34, 0.61]). Also independently associated with varus thrust were age, sex, BMI, disease severity, strength, and alignment. The odds of valgus thrust were greater for African Americans than for Caucasians in persons without knee OA (adjusted OR 1.69 [95% CI 1.02, 2.80]) and in those with knee OA (adjusted OR 1.98 [95% CI 1.35, 2.91]). Also independently associated with valgus thrust were disease severity and malalignment. CONCLUSION: Compared with Caucasians, African Americans had lower odds of varus thrust and greater odds of valgus thrust. These findings may help explain the difference between these groups in the pattern of OA involvement at the knee.
OBJECTIVE: Varus thrust observed during gait has been shown to be associated with a 4-fold increase in the risk of medial knee osteoarthritis (OA) progression. Valgus thrust is believed to be less common than varus thrust; the prevalence of each is uncertain. Racial differences in risk factors may help explain variations in the natural history of knee OA. We undertook this study to determine the frequency of varus and valgus thrust in African Americans and Caucasians and to identify factors associated with thrust presence. METHODS: The Osteoarthritis Initiative cohort includes men and women who have knee OA or are at increased risk of developing it. Trained examiners assessed thrust presence by gait observation. Logistic regression with generalized estimating equations was used to identify factors associated with thrust presence, and odds ratios (ORs) with 95% confidence intervals (95% CIs) were calculated. RESULTS: Compared with Caucasians, African Americans had lower odds of varus thrust, controlling for age, sex, body mass index (BMI), injury, surgery, disease severity, strength, pain, and alignment in persons without knee OA (adjusted OR 0.50 [95% CI 0.36, 0.72]) and in those with knee OA (adjusted OR 0.46 [95% CI 0.34, 0.61]). Also independently associated with varus thrust were age, sex, BMI, disease severity, strength, and alignment. The odds of valgus thrust were greater for African Americans than for Caucasians in persons without knee OA (adjusted OR 1.69 [95% CI 1.02, 2.80]) and in those with knee OA (adjusted OR 1.98 [95% CI 1.35, 2.91]). Also independently associated with valgus thrust were disease severity and malalignment. CONCLUSION: Compared with Caucasians, African Americans had lower odds of varus thrust and greater odds of valgus thrust. These findings may help explain the difference between these groups in the pattern of OA involvement at the knee.
Authors: Amanda E Nelson; Larissa Braga; Andresa Braga-Baiak; Julius Atashili; Todd A Schwartz; Jordan B Renner; Charles G Helmick; Joanne M Jordan Journal: J Rheumatol Date: 2009-07-15 Impact factor: 4.666
Authors: L Braga; J B Renner; T A Schwartz; J Woodard; C G Helmick; M C Hochberg; J M Jordan Journal: Osteoarthritis Cartilage Date: 2009-09-01 Impact factor: 6.576
Authors: Kerry E Costello; Samantha Eigenbrot; Alex Geronimo; Ali Guermazi; David T Felson; Jim Richards; Deepak Kumar Journal: Clin Biomech (Bristol, Avon) Date: 2020-11-11 Impact factor: 2.063
Authors: Christopher D Stickley; Melanie M Presuto; Kara N Radzak; Christina M Bourbeau; Ronald K Hetzler Journal: J Athl Train Date: 2018-01-26 Impact factor: 2.860
Authors: Song Joo Lee; Yupeng Ren; Alison H Chang; Joel M Press; Marc C Hochberg; Li-Qun Zhang Journal: IEEE Trans Neural Syst Rehabil Eng Date: 2020-06-26 Impact factor: 3.802