Sensory deficits in runners with an overuse injury

NewsBot · Jun 27, 2014

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Differences in Joint Position Sense and Vibratory Threshold in Runners With and Without a History of Over-Use Injury.
Switlick T, Kernozek TW, Meardon S.
J Sport Rehabil. 2014 Jun 24

CONTEXT:
A relationship between altered postural control and injury has been reported in sports. Sensorimotor function serves a fundamental role in postural control and is not often studied in runners. Persons who sustain running injury may have altered sensorimotor function contributing to risk of injury or re-injury.
OBJECTIVES:
To determine if differences in knee and ankle proprioception or plantar sensation exist between injured and non-injured runners.
DESIGN:
Retrospective Case Control Study.
SETTING:
University Campus.
PARTICIPANTS:
20 runners with a history of lower extremity overuse injury and 20 non-injured runners were examined. Injured runners were subcategorized into 2 groups based on site of injury: foot/ankle and knee/hip.
MAIN OUTCOME MEASURES:
Active absolute joint repositioning error of the ankle at 20° inversion and 10° eversion and the knee at 15° and 40° knee flexion was assessed using an isokinetic dynamometer. Vibratory threshold at the calcaneus, arch, and great toe was determined for each subject using a hand-held electric sensory threshold instrument.
RESULTS:
Runners in the injured foot/ankle group had increased absolute error during ankle eversion repositioning (6.55 ± 3.58º) compared to those in the non-injured (4.04 ± 1.78º; ; p=0.01) and the hip/knee (3.63 ± 2.2; p=0.01) groups. Runners in the injured group, as a whole, had greater sensitivity in the arch of the plantar surface (2.94 ± 0.52 V) than non-injured runners (2.38 ± 0.53 V; p=0.02).
CONCLUSIONS:
Differences in ankle eversion proprioception between runners with a history of ankle and foot injuries and non-injured runners were observed. Runners with a history of injury also displayed an increased vibratory threshold in the arch region compared to non-injured runners. Poor ankle joint position sense and increased plantar sensitivity suggest altered sensorimotor function following injury. These factors may influence underlying postural control and contribute to altered loading responses commonly observed in injured runners.
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Craig Payne · Jun 27, 2014

I blogged on this study:
http://www.runresearchjunkie.com/sensory-deficits-in-runners-with-an-overuse-injury/

biggest issues: chicken or egg and differences small (even though statistically significant)

NewsBot · Jun 10, 2016

INFLUENCE OF INJURY ON DYNAMIC POSTURAL CONTROL IN RUNNERS.
Meardon S, Klusendorf A, Kernozek T
Int J Sports Phys Ther. 2016 Jun;11(3):366-377

BACKGROUND:
Injury has been linked with altered postural control in active populations. The association between running injury and dynamic postural control has not been examined.
HYPOTHESIS/PURPOSE:
The purpose of this study was to examine dynamic postural control in injured and uninjured runners using the Star Excursion Balance Test (SEBT), Time to Stabilization (TTS) of ground reaction forces following a single-leg landing, and postural stability indices reflecting the fluctuations in GRFs during single-leg landing and stabilization tasks (forward and lateral hop). It was hypothesized that dynamic postural control differences would exist between runners with a history of injury that interrupted training for ≥7 days (INJ) when compared to runners without injury (CON).
DESIGN:
Case-control study.
METHODS:
Twenty-two INJ (14 F, 8 M; 23.7 ? 2.1 y; 22.3 ? 2.8 kg/m2; 29.5 ? 16.3 mi/wk) currently running > 50% pre-injury mileage without pain were compared with twenty-two matched CON (14F, 8M; 22.7 ? 1.2 y; 22.7 ? 2.7 kg/m2; 31.2 ? 19.6 mi/wk). INJ group was stratified by site of injury into two groups (Hip/Thigh/Knee and Lower Leg/Ankle/Foot) for secondary analysis. Leg length-normalized anterior, posterolateral, and posteromedial reach distances on the SEBT, medial/lateral and anterior/posterior ground reaction force TTS, directional postural stability indices, and a composite dynamic postural stability index (DPSI), were assessed using mixed model ANOVA (α=0.05) and effect sizes (d).
RESULTS:
No group X direction interaction or group differences were observed for the SEBT (p=0.51, 0.71) or TTS (p=0.83, 0.72) measures. A group X direction interaction was found for postural stability indices during the forward landing task (p<0.01). Both Hip/Thigh/Knee and Lower leg/Ankle/Foot INJ groups demonstrated a greater vertical postural stability index (VPSI) (p=0.01 for both, d=0.80, 0.95) and DPSI (p=0.01, 0.02, d=0.75, 0.93) when compared to CON suggesting impaired balance control. A group X direction interaction was also found for postural stability indices during the lateral landing task (p=0.03). Only the Hip/Thigh/Knee INJ runners displayed a greater VPSI (p=0.01, d=0.91) and DPSI (p=0.017, d=0.89) when compared to CON.
CONCLUSIONS:
When compared to CON, INJ runners demonstrated impaired dynamic control of vertical forces when performing the single leg landing and stabilization tasks. Clinicians should consider addressing dynamic control of vertical loads through functional tasks during the rehabilitation of running injury.
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Sensory deficits in runners with an overuse injury

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Sensory deficits in runners with an overuse injury

NewsBot The Admin that posts the news.

Craig Payne Moderator

NewsBot The Admin that posts the news.

Plantar sensory deficits and chronic ankle instability

Tactile plantar stimulation in sensory deficits improves postural control

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Share This Page

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