Physiotherapy - Research Publications

Permanent URI for this collection

http://hdl.handle.net/11343/260

Filters

2022 4
4
Reset filters

Settings
Statistics
Citations
Author: Hall, Michelle × Author: Hinman, Rana × Author: Knox, Gabrielle × Author: Starkey, Scott × Start date: 2021 ×

Search Results

Now showing 1 - 4 of 4
  • Item
    No Preview Available
    MUSCLE FORCES DURING WEIGHTBEARING EXERCISES IN MEDIAL KNEE OSTEOARTHRITIS AND VARUS MALALIGNMENT: A CROSS-SECTIONAL STUDY
    Starkey, SC ; Diamond, LE ; Hinman, RS ; Saxby, DJ ; Knox, G ; Hall, M (ELSEVIER SCI LTD, 2022-04)
  • Item
    Thumbnail Image
    Muscle Forces during Weight-Bearing Exercises in Medial Knee Osteoarthritis and Varus Malalignment: A Cross-Sectional Study
    Starkey, SC ; Diamond, LE ; Hinman, RS ; Saxby, DJ ; Knox, G ; Hall, M (LIPPINCOTT WILLIAMS & WILKINS, 2022-09)
    PURPOSE: This study aimed to test the hypothesis that common weight-bearing exercises generate higher lower-limb muscle forces but do not increase medial tibiofemoral contact force (MTCF) when compared with walking in people with medial knee osteoarthritis and varus malalignment. METHODS: Twenty-eight participants 50 yr or older with medial knee osteoarthritis and varus malalignment were recruited from the community. Three-dimensional lower-body motion, ground reaction forces, and surface EMG from 12 lower-limb muscles were acquired during five squat, lunge, single-leg heel raise, and walking trials, performed at self-selected speeds. An EMG-informed neuromusculoskeletal model with subject-specific bone geometry was used to estimate muscle forces (N) and body weight (BW)-normalized MTCF. The peak forces for muscle groups (knee extensors, knee flexors, ankle plantar flexors, and hip abductors) and peak MTCF were compared with walking using a multivariate analysis of variance model. RESULTS: There was a significant main effect ( P < 0.001). Post hoc tests (mean difference (95% confidence intervals)) showed that, compared with walking, participants generated higher peak knee extensor and flexor forces during squatting (extensor: 902 N (576 to 1227 N), flexor: 192 N (9.39 to 375 N)) and lunging (extensor: 917 N (604 to 1231 N), flexor: 496 N (198 to 794 N)), and lower peak hip abductor force during squatting (-1975 N (-2841 to -1108 N)) and heel raises (-1217 N (-2131 to -303 N)). Compared with walking, MTCF was lower during squatting (-0.79 BW (-1.04 to -0.53 BW)) and heel raises (-0.27 BW (-0.50 to -0.04 BW)). No other significant differences were observed. CONCLUSIONS: Participants generated higher peak knee flexor and extensor forces during squatting and lunging but did not increase peak MTCF compared with walking. Clinicians can use these findings to reassure themselves and patients that weight-bearing exercises in these positions do not adversely increase forces within the osteoarthritic joint compartment.
  • Item
    Thumbnail Image
    Effect of a valgus brace on medial tibiofemoral joint contact force in knee osteoarthritis with varus malalignment: A within-participant cross-over randomised study with an uncontrolled observational longitudinal follow-up
    Hall, M ; Starkey, S ; Hinman, RS ; Diamond, LE ; Lenton, GK ; Knox, G ; Pizzolato, C ; Saxby, DJ ; Abdelbasset, WK (PUBLIC LIBRARY SCIENCE, 2022)
  • Item
    Thumbnail Image
    Tibiofemoral contact force differences between flat flexible and stable supportive walking shoes in people with varus-malaligned medial knee osteoarthritis: A randomized cross-over study
    Starkey, S ; Hinman, R ; Paterson, K ; Saxby, D ; Knox, G ; Hall, M ; Peyré-Tartaruga, LA (PUBLIC LIBRARY SCIENCE, 2022)
    OBJECTIVE: To compare the effect of stable supportive to flat flexible walking shoes on medial tibiofemoral contact force (MTCF) in people with medial knee osteoarthritis and varus malalignment. DESIGN: This was a randomized cross-over study. Twenty-eight participants aged ≥50 years with medial knee osteoarthritis and varus malalignment were recruited from the community. Three-dimensional full-body motion, ground reaction forces and surface electromyograms from twelve lower-limb muscles were acquired during six speed-matched walking trials for flat flexible and stable supportive shoes, tested in random order. An electromyogram-informed neuromusculoskeletal model with subject-specific geometry estimated bodyweight (BW) normalized MTCF. Waveforms were analyzed using statistical parametric mapping with a repeated measures analysis of variance model. Peak MTCF, MTCF impulse and MTCF loading rates (discrete outcomes) were evaluated using a repeated measures multivariate analysis of variance model. RESULTS: Statistical parametric mapping showed lower MTCF in stable supportive compared to flat flexible shoes during 5-18% of stance phase (p = 0.001). For the discrete outcomes, peak MTCF and MTCF impulse were not different between the shoe styles. However, mean differences [95%CI] in loading impulse (-0.02 BW·s [-0.02, 0.01], p<0.001), mean loading rate (-1.42 BW·s-1 [-2.39, -0.45], p = 0.01) and max loading rate (-3.26 BW·s-1 [-5.94, -0.59], p = 0.02) indicated lower measure of loading in stable supportive shoes compared to flexible shoes. CONCLUSIONS: Stable supportive shoes reduced MTCF during loading stance and reduced loading impulse/rates compared to flat flexible shoes and therefore may be more suitable in people with medial knee osteoarthritis and varus malalignment. TRIAL REGISTRATION: Australian and New Zealand Clinical Trials Registry (12619000622101).