Females with patellofemoral pain have impaired impact absorption during a single-legged drop vertical jump

Publication date: Available online 10 December 2018

Source: Gait & Posture

Author(s): Guilherme S. Nunes, Christian John Barton, Fábio Viadanna Serrão

Abstract

Background

Females with patellofemoral pain (PFP) have been reported to land with altered biomechanics in some, but not all studies. Kinematic alterations previously reported may indicate, and relate to potential impairments in absorbing impact.

Research question

To compare vertical ground reaction force (vGRF) and lower limb kinematics during single-legged drop vertical jumps in females with and without PFP; and establish the relationship between vGRF and kinematics during this task.

Methods

Fifty-two physically active females (26 with PFP and 26 controls) participated in the present cross-sectional study. Peak of vGRF was evaluated during landing; and lower limb kinematics in the sagittal and frontal planes during deceleration (landing) and acceleration (take-off) phases were evaluated.

Results

The PFP group had 11% greater vGRF (p < 0.01); and 13-24% lower hip, knee and ankle excursion in the sagittal plane during acceleration and deceleration phases (p ≤ 0.02) compared to the control group. No significant between group differences (p > 0.05) for hip, knee and ankle excursion in the frontal plane were identified. Greater impact was significantly correlated with reduced knee (r =–0.56), hip (r =–0.50) and ankle (r =–0.41) excursion in the sagittal plane during the acceleration phase in the control group, but not in the PFP group. No significant correlations were found between vGRF and kinematics variables during the deceleration phase in either group.

Significance

Impaired ability to absorb load and reduced lower limb movement in the sagittal plane during landing in females with PFP may provide separate treatment targets during rehabilitation.

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Concurrent Validity and Measurement Error of Stair Climb Test in People with Pre-radiographic to Mild Knee Osteoarthritis

Publication date: Available online 10 December 2018

Source: Gait & Posture

Author(s): Hirotaka Iijima, Kanako Shimoura, Ryo Eguchi, Tomoki Aoyama, Masaki Takahashi

Abstract

Background

Stair climbing is the task first affected in patients with knee osteoarthritis (OA); therefore, the precise measurement of time required to climb stairs is important to identify mobility limitations, particularly in the early phase of knee OA.

Research question

This study aimed to examine the test-retest reliability, measurement error, and concurrent validity of the stopwatch-based stair-climb test (SCT) in adults with pre-radiographic to mild knee OA.

Methods

Fifty-nine participants (mean age, 59.1 [range, 50–69] years; 72.9% female) with Kellgren and Lawrence grade ≤2 disease underwent an 11-step SCT (11-SCT) in accordance with the Osteoarthritis Research Society International recommended method while wearing pressure sensor-mounted standard shoes that is used as a gold standard procedure. Test-retest reliability, measurement errors, and the concurrent validity of the stopwatch-based 11-SCT were evaluated.

Results

The test-retest reliability of the stopwatch-based 11-SCT was excellent (intra-class correlation coefficient_1,1 [ICC_1,1], 0.952; 95% confidence interval [CI], 0.560 to 0.985; p <  0.001) and the minimal detectable change₉₅ was 0.102 s. Concurrent validity was excellent (ICC_2,1: 0.957; 95% CI: 0.661 to 0.986; p <  0.001).

Significance

The stopwatch-based 11-SCT had high test-retest reliability and high concurrent validity, which justify its clinical use for identifying mobility limitations in individuals with pre-radiographic to mild knee OA. A difference of 0.2 s in the stopwatch-based 11-SCT time would be considered a true difference beyond a 95% measurement error.

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Females with patellofemoral pain have impaired impact absorption during a single-legged drop vertical jump

Publication date: Available online 10 December 2018

Source: Gait & Posture

Author(s): Guilherme S. Nunes, Christian John Barton, Fábio Viadanna Serrão

Abstract

Background

Females with patellofemoral pain (PFP) have been reported to land with altered biomechanics in some, but not all studies. Kinematic alterations previously reported may indicate, and relate to potential impairments in absorbing impact.

Research question

To compare vertical ground reaction force (vGRF) and lower limb kinematics during single-legged drop vertical jumps in females with and without PFP; and establish the relationship between vGRF and kinematics during this task.

Methods

Fifty-two physically active females (26 with PFP and 26 controls) participated in the present cross-sectional study. Peak of vGRF was evaluated during landing; and lower limb kinematics in the sagittal and frontal planes during deceleration (landing) and acceleration (take-off) phases were evaluated.

Results

The PFP group had 11% greater vGRF (p < 0.01); and 13-24% lower hip, knee and ankle excursion in the sagittal plane during acceleration and deceleration phases (p ≤ 0.02) compared to the control group. No significant between group differences (p > 0.05) for hip, knee and ankle excursion in the frontal plane were identified. Greater impact was significantly correlated with reduced knee (r =–0.56), hip (r =–0.50) and ankle (r =–0.41) excursion in the sagittal plane during the acceleration phase in the control group, but not in the PFP group. No significant correlations were found between vGRF and kinematics variables during the deceleration phase in either group.

Significance

Impaired ability to absorb load and reduced lower limb movement in the sagittal plane during landing in females with PFP may provide separate treatment targets during rehabilitation.

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via IFTTT

Concurrent Validity and Measurement Error of Stair Climb Test in People with Pre-radiographic to Mild Knee Osteoarthritis

Publication date: Available online 10 December 2018

Source: Gait & Posture

Author(s): Hirotaka Iijima, Kanako Shimoura, Ryo Eguchi, Tomoki Aoyama, Masaki Takahashi

Abstract

Background

Stair climbing is the task first affected in patients with knee osteoarthritis (OA); therefore, the precise measurement of time required to climb stairs is important to identify mobility limitations, particularly in the early phase of knee OA.

Research question

This study aimed to examine the test-retest reliability, measurement error, and concurrent validity of the stopwatch-based stair-climb test (SCT) in adults with pre-radiographic to mild knee OA.

Methods

Fifty-nine participants (mean age, 59.1 [range, 50–69] years; 72.9% female) with Kellgren and Lawrence grade ≤2 disease underwent an 11-step SCT (11-SCT) in accordance with the Osteoarthritis Research Society International recommended method while wearing pressure sensor-mounted standard shoes that is used as a gold standard procedure. Test-retest reliability, measurement errors, and the concurrent validity of the stopwatch-based 11-SCT were evaluated.

Results

The test-retest reliability of the stopwatch-based 11-SCT was excellent (intra-class correlation coefficient_1,1 [ICC_1,1], 0.952; 95% confidence interval [CI], 0.560 to 0.985; p <  0.001) and the minimal detectable change₉₅ was 0.102 s. Concurrent validity was excellent (ICC_2,1: 0.957; 95% CI: 0.661 to 0.986; p <  0.001).

Significance

The stopwatch-based 11-SCT had high test-retest reliability and high concurrent validity, which justify its clinical use for identifying mobility limitations in individuals with pre-radiographic to mild knee OA. A difference of 0.2 s in the stopwatch-based 11-SCT time would be considered a true difference beyond a 95% measurement error.

from #Audiology via ola Kala on Inoreader https://ift.tt/2QnzvYl
via IFTTT