Safety/Injury. Short-Term. Long-Term. Balance/Imbalance Acute Injury Falls
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1 Safety/Injury Short-Term Long-Term Balance/Imbalance Acute Injury Falls Resistance/Susceptibility Chronic injuries Overuse injuries Degenerative wear and tear processes Safety/Injury Balance/Imbalance-Falls Resistance/Susceptibility Forces: Accelerations/Decelerations Joints: Stability/Instability Traction/Impingement Muscles: Strength/Weakness Energy Efficiency Stride length/step cadence Braking Gliding Bounce/Elasticity Resonance Muscle work Performance Dynamic/Static Foot Posture Adaptation
2 Center of Mass - COM
3 Safety/Injury Balance/Imbalance-Falls Safety/Injury Balance/Imbalance-Falls Resistance/Susceptibility Forces: Accelerations/Decelerations Joints: Stability/Instability Traction/Impingement Muscles: Strength/Weakness Energy Efficiency Stride length/step cadence Braking Gliding Bounce/Elasticity Resonance Muscle work Performance Dynamic/Static Foot Posture Adaptation
4 Safety Balance/Imbalance
5 Walking Balance Somatosensory Feedback Plantar foot receptors Base of Support Stride length Stride width Inertial Stability Reciprocal UE and LE movement Step cadence
6 Inertial Stability Key to Walking Balance SHORTEN STRIDE Higher cadence/step frequency Higher reciprocal UE and LE movement Increase inertial stability
7 Walking Balance Inertial Stability (DW/HBW) (HTW) Step Cadence Dependent Balance - DW/HBW Higher step cadence More reciprocal UE & LE movement Increased inertial stability Imbalance - HTW Lower step cadence Less reciprocal UE & LE movement Decreased inertial stability
8 Safety/Injury Resistance/Susceptibility Safety/Injury Balance/Imbalance-Falls Resistance/Susceptibility Forces: Accelerations/Decelerations Joints: Stability/Instability Traction/Impingement Muscles: Strength/Weakness Energy Efficiency Stride length/step cadence Braking Gliding Bounce/Elasticity Resonance Muscle work Performance Dynamic/Static Foot Posture Adaptation
9 Safety/Injury Forces: Accelerations/Decelerations Loading forces Stride length Foot strike Pressure Impulse Joint movement forces Torques/Moments More motion/more force Safety/Injury Balance/Imbalance-Falls Resistance/Susceptibility Forces: Accelerations/Decelerations Joints: Stability/Instability Traction/Impingement Muscles: Strength/Weakness Energy Efficiency Stride length/step cadence Braking Gliding Bounce/Elasticity Resonance Muscle work Performance Dynamic/Static Foot Posture Adaptation
10 Precontact Set-up For Loading DW/HBW HTW Set-up Foot strike Knee position Foot position relative to COM
11 Initial Contact Foot Strike DW/HBW HTW Foot Strike Fore-foot strike (ball) Mid-foot strike Rear-foot strike (heel)
12 Initial Contact Loading Forces DW/HBW HTW
13 Safety/Injury Joints: Stability/Instability DW/HBW Muscle co-contractions Multiple muscle contractions at any moment More isometric contractions Joint stability - creates dynamic stability Ligament/capsule strains less Tendon traction injury - less Joint impingement - less HTW Agonist/antagonist Single muscle contraction at any moment More concentric contractions More eccentric contractions Joint stability - relies more on static stability Ligament/capsule strains - more Tendon traction injury - more Joint impingement - more Safety/Injury Balance/Imbalance-Falls Resistance/Susceptibility Forces: Accelerations/Decelerations Joints: Stability/Instability Traction/Impingement Muscles: Strength/Weakness Energy Efficiency Stride length/step cadence Braking Gliding Bounce/Elasticity Resonance Muscle work Performance Dynamic/Static Foot Posture Adaptation
14 Safety/Injury Joints: Traction/Impingement TRACTION Hip hamstring avulsion Hip gluteus medius tendinitis Knee patellar tendinitis Knee quadriceps tendinitis Knee Osgood Schlatter disease Ankle Achilles injury Heel Sever disease IMPINGEMENT Hip FAI/Labral tear Knee posterior sprain Ankle anterior ankle impingement Midfoot dorsal midfoot arthritis Hallux orsal arthritis Safety/Injury Balance/Imbalance-Falls Resistance/Susceptibility Forces: Accelerations/Decelerations Joints: Stability/Instability Traction/Impingement Muscles: Strength/Weakness Energy Efficiency Stride length/step cadence Braking Gliding Bounce/Elasticity Resonance Muscle work Performance Dynamic/Static Foot Posture Adaptation
15 Safety/Injury Muscles: Strength/Weakness ACTIVE WALKING (DW/HBW) Muscle co-contractions Muscles contracting each step more Increased lower extremity strength over time Obesity less problematic LAZY WALKING (HTW) Agonist/antagonist Muscles contracting each step less Decreased lower extremity strength over time Muscle weakness causes arthritis Safety/Injury Balance/Imbalance-Falls Resistance/Susceptibility Forces: Accelerations/Decelerations Joints: Stability/Instability Traction/Impingement Muscles: Strength/Weakness Energy Efficiency Stride length/step cadence Braking Gliding Bounce/Elasticity Resonance Muscle work Performance Dynamic/Static Foot Posture Adaptation
16 Safety/Injury Forces/Joint Stability/Muscle Strength (DW/HBW) (HTW) Stride Length Dependent DW/HBW Accelerations/decelerations lower Joint motion forces lower Joint dynamic stability higher Joint tractions less Joint impingement - less Muscle strengthening higher with each step HTW Accelerations/decelerations higher Joint motion forces higher Joint dynamic stability lower Joint tractions more Joint impingement - more Muscle strengthening lower with each step
17 MUSCULOSKELETAL (MSK) DISEASE MSK diseases occur because people are to weak for their body weight and activity level due to the maladaptive heeltoe walking gait created by shoes and aggravated by the modern cushioned shoe.
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