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Hamstring weakness at 90° flexion of involved knee as an indicator of the function deficit in males after anterior cruciate ligament reconstruction (ACLR)

Balki Selvin, Eldemir Sefa

Acta of Bioengineering and Biomechanics

2021

Vol. 23, no. 3

147--153

Purpose: The aim of this study was to elucidate predictors on knee function following anterior cruciate ligament reconstruction with hamstring tendon graft or allograft and to detect the differences between it and the healthy controls. Methods: This study comprised of 46 males, aged 18–45, being within 6–60 months following unilateral anterior cruciate ligament reconstruction and 50 healthy men. Measurements included the Tampa Scale for Kinesiophobia-17, the self-reported knee function with the Knee Injury and Osteoarthritis Outcome Score, Tegner activity scale and handheld dynamometry the hamstring/quadriceps femoris muscle testing at 90° of flexion. Regression analyses were performed to predict the knee function in the anterior cruciate ligament reconstruction group. Results: The anterior cruciate ligament reconstruction group showed significantly lower Tegner activity and hamstring/quadriceps femoris strength, higher kinesiophobia and worse Knee Injury and Osteoarthritis Outcome Score (p < 0.05). Their Knee Injury and Osteoarthritis Outcome Score-Sport/Recrection, Quality of Life and –Total values were modestly associated with the satisfaction with prior rehabilitation, activity level, graft type, kinesiophobia, time since the reconstruction and hamstring strength ( p < 0.05). The hamstring strength was the only important predictor of the Knee Injury and Osteoarthritis Outcome Score-Total (p < 0.01). The involved knee handheld dynamometrymass normalize-hamstring strength at 90° of flexion predicted 20.5% of the variance in the knee function. Conclusions: Presence of a decreased handheld dynamometry-mass normalized-hamstring strength result at hyper-flexion after anterior cruciate ligament reconstruction in men may indicate self-reported knee function disorder.

Assessment of isometric strength of the shoulder rotators in swimmers using a handheld dynamometer : a reliability study

Coinceicao A., Parraca J., Marinho D., Costa M., Louro H., Silva A., Batalha N.

Acta of Bioengineering and Biomechanics

2018

Vol. 20, no. 4

113--119

The purpose of this study was to determine the reliability of shoulder isometric strength assessment using the microfet 2™ dynamometer in adolescent swimmers. Methods: Twenty-nine participants (16.2 ± 1.2 years old; 59.05 ± 6.98 kg of body mass) were tested using the microfet 2™ dynamometer. Swimmers performed an isometric strength test (IST) in two distinct occasions with 7 days apart in order to calculate the reliability. All participants were asked to perform a maximal isometric contraction from the external and internal shoulder rotators in a prone body position. Results: The external and internal shoulder rotators showed an excellent intraclass correlation coefficients for both shoulders, with more than 0.90 and a low percentage of method error variation. The external/internal ratios reliability was good in dominant (ICC 0.80) and non-dominant (ICC 0.81) shoulders. The reliability using Bland–Altman method showed that systematic errors (mean difference between test-retest) were nearly zero and the 95% limits of agreement narrow, indicating a good reliability. Conclusions: It can be concluded that microfet 2™ is a reliable apparatus for measuring the strength of the external and internal rotation of the shoulder in swimmers. Its light weight and easy portable characteristics can help swimming coaches monitoring specific dry-land strength training programs for their swimmers.