Trial reportPhysical therapy2017
Influence of Hip Abductor Strength on Functional Outcomes Before and After Total Knee Arthroplasty: Post Hoc Analysis of a Randomized Controlled Trial.
Trial report in Physical therapy, 2017. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 14 papers, 1 of them a synthesis that pooled it.
What it found
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The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.
The trial behind it
Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.
Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.
Who cites it
14 citing papers in PubMed, 1 synthesis or guideline pooled it.
- Performance-Based Outcome Measures After Hip or Knee Arthroplasty: A Systematic Review and Content Analysis Using the International Classification of Functioning, Disability and Health (ICF).Journal of evaluation in clinical practice · 2025Pooled it
- Characteristics of muscle morphological changes in the lower limb after total knee arthroplasty.International orthopaedics · 2026Article
- Hip Strengthening After Total Knee Arthroplasty: A Meta-analysis and Systematic Review.The archives of bone and joint surgery · 2024Review
- Cut-off values of preoperative knee extensor strength and hip abductor strength for predicting good walking ability after total knee arthroplasty.Archives of orthopaedic and trauma surgery · 2024Article
- Hip Abductor Weakness and Its Association With New or Worsened Knee Pain: Data From the Multicenter Osteoarthritis Study.Arthritis care & research · 2023Article
- Hip abduction angle after open-wedge high tibial osteotomy is associated with the timed up & go test and recurrence of varus alignment.Scientific reports · 2023Article
- Verification of biomechanical factors of gait related to medial knee loading in patients 6 Months after total knee arthroplasty.Journal of clinical orthopaedics and trauma · 2023Article
- Do we still need to screen our patients?-Orthopaedic scoring based on motion tracking.International orthopaedics · 2023Article
- Effects of Muscle Strengthening around the Hip on Pain, Physical Function, and Gait in Elderly Patients with Total Knee Arthroplasty: A Randomized Controlled Trial.Healthcare (Basel, Switzerland) · 2020Article
- Article
- Core Outcome Measurement Instruments for Clinical Trials of Total Knee Arthroplasty: A Systematic Review.Journal of clinical medicine · 2020Review
- Step descent strategy is altered bilaterally despite unilateral muscle strength impairment after total knee arthroplasty.Knee surgery, sports traumatology, arthroscopy : official journal of the ESSKA · 2020Article
- The relationship between lower extremity swelling, quadriceps strength, and functional performance following total knee arthroplasty.The Knee · 2019Observational
- Rate of torque development is the primary contributor to quadriceps avoidance gait following total knee arthroplasty.Gait & posture · 2019Article
Corrections and comments
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Authors and funding
7 authors.
Funding
Abstract
backgroundTotal knee arthroplasty (TKA) is associated with declines in hip abductor (HA) muscle strength; however, a longitudinal analysis demonstrating the influence of TKA on trajectories of HA strength change has not been conducted.
objectiveThe purpose of this study was to quantify changes in HA strength from pre-TKA through 3 months post-TKA and to characterize the relationship between HA strength changes and physical performance.
designThis study is a post hoc analysis of a randomized controlled trial.
methodsData from 162 participants (89 women, mean age = 63 y) were used for analysis. Data were collected by masked assessors preoperatively and at 1 and 3 months following surgery. Outcomes included: Timed "Up and Go" test (TUG), Stair Climbing Test (SCT), Six-Minute Walk Test (6MWT), and walking speed. Paired t tests were used for between- and within-limb comparisons of HA strength. Multivariable regression was used to determine contributions of independent variables, HA and knee extensor strength, to the dependent variables of TUG, SCT, 6MWT, and walking speed at each time point.
resultsHip abductor strength was significantly lower in the surgical limb pre-TKA (mean = 0.015; 95% CI = 0.010-0.020), 1 month post-TKA (0.028; 0.023-0.034), and 3 months post-TKA (0.02; 0.014-0.025) compared with the nonsurgical limb. Hip abductor strength declined from pre-TKA to 1 month post-TKA (18%), but not at the 3-month time point (0%). Hip abductor strength independently contributed to performance-based outcomes pre-TKA; however, this contribution was not observed post-TKA. LIMITATIONS: The post hoc analysis prevents examining all outcomes likely to be influenced by HA strength.
conclusionsSurgical limb HA strength is impaired prior to TKA, and worsens following surgery. Furthermore, HA strength contributes to performance-based outcomes, supporting the hypothesis that HA strength influences functional recovery.
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