What is SSI?

Shoe Stability Index (SSI) is an indicator of shoe stability, as an index. SSI is derived through mathematically combining the quantified measurements of midfoot stability (TCI) and hindfoot stability (VCI), indicating the shoe’s overall ability to control the motion of the foot.

What is TCI?

Torsion Control Index (TCI) is a measurement of midfoot shoe stability, in inch-pound units (in.-lbs.). TCI is measured through actively twisting a shoe around the longitudinal axis of the shoe, from the heel to the area of the toes joints, simulating rotational forces of the foot, and measuring the shoe’s resistance to this motion.

The higher the TCI, the firmer the midfoot and more torsional stability. The lower the TCI, the softer the midfoot and less torsional stability.

What is VCI?

Vertical Compression Index (VCI) is a measurement of hindfoot shoe stability, in millimeters (mm). VCI is measured through compression of the heel portion of the shoe under a fixed amount of pressure, thereby measuring how the structure of the shoe controls rearfoot motion.

The higher the VCI, the softer the midsole and less hindfoot stability. The lower the VCI, the firmer the midsole and more hindfoot stability.

What is Loaded Heel to Toe Drop?

Loaded Heel to Toe Drop is the measurement in millimeters of the height of the heel relative to the fore foot when compressed to a fixed poundage. This can be defined as vertical support.

What is RI?

Rebound Index (RI) is an indicator of energy return of shoe to the foot, in millimeters (mm). RI is measured through compression of the heel portion of the shoe under a fixed amount of pressure, and then determining how much force the shoe exerts on the foot.

Ilio-Tibial Band Syndrome

Print-Friendly Version


  • Lateral knee pain which increases with running and walking activities
  • Occasional hip pain
  • Tenderness at the hip and/or outside of lower thigh and knee

Possible Causes

  • Leg length discrepancy
  • Excessive pronation
  • Excessive tibial rotation
  • Pes Cavus foot (high arch)
  • Tight ilio-tibal band
  • Soft, unstable shoes
  • Weak hip stabilizers (abductors)

Shoe Profile

For moderate to excessive pronators: the long axis of the shoe should provide maximum torsional control of medial foot rotation (pronation) during the weight-bearing phase of the gait cycle. Proper support slackens the Ilio-Tibial band, reducing friction and irritation at the hip and the outside of the knee.

For supinators: the long axis of the shoe should provide maximum torsional control of foot rotation (especially outward rotation). Try to avoid shoes with heavy medial posting so as not to encourage increased supination.


Neutral (mild pronators) – Over-the-counter orthotics may be beneficial
Moderate to excessive pronators and supinators – Custom orthotics

Shoe Recommendations

The following shoes meet these criteria. Please click on the appropriate link to see the shoes and their test data.

personal_male_2 personal_female_2

Recommended Accessories

SuperFeet arch supports

For the overpronator, it is effective on reducing pain and tension in the ITB.

ProTec ITB Compression Wrap

Effective in reducing lateral knee pain due to ITB syndrome.

The Stick

Effective for massaging the ITB to release tissue tension and pain.

TheraBand Loops

Excellent way to strengthen the core muscles of the hips. Stability in the hips helps to reduce ITB pain.

SKLZ Cold Roller Ball

Provides targeted massage and ice therapy to reduce pain and inflammation.


**Please consult your physican before engaging in an exercise program.**

With all strengthening exercises, start with 3 sets of 10. If you experience any sort of pain reduce your reps to 3 sets of 5 repetitions. For all stretches, repeat 3 times holding each stretch for 30 seconds to 1 minute. Using RICE (Rest, Ice, Compression, Elevation) can be beneficial in the treatment of injuries as well.

Ilio-tibial band standing bent to side stretch
Ilio-tibial band long sitting stretch
  1. Stand in a spacious area with room to bend to the side.
  2. Cross the leg to be stretched behind the other leg.
  3. Tip your trunk to the opposite side of the leg to be stretched and reach towards the floor with both hands and hold.
  4. Return to the starting position, relax and repeat.
  1. Sit on the floor with the leg to be stretched straight out and the other leg bent out to the side.
  2. Roll the side of the foot of the straight leg so it is touching the floor.
  3. Sit up and turn trunk to the side of the straight leg and place hand on the floor, straight across from the hip, keeping elbow straight. Your trunk and hip should be at a 90 degree angle.
  4. Bend other elbow and lean trunk over, attempting to touch elbow to floor. Keep the opposite elbow straight during the stretch.
  5. Return to starting position, relax and repeat.
Leg Sideways (Abductors) Elastic Ankle
  1. Attach elastic at ankle and stand with uninvolved side toward the attachment and elastic looped around leg at ankle.
  2. Pick up slack by stepping away from attachment.
  3. Stand with good erect posture and don’t lean trunk during exercise.
  4. Pull out with leg against elastic.
  5. Slowly return to starting position and repeat.

Images reproduced courtesy of T.E.D.© (Therapeutic Exercise Database) V. 2.0

October 2023 test data is now live!