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KNEE POST-OP FUNCTIONAL EVALUATION & SPORTS TESTING
General considerations
Michael J. Mullin, ATC, PTA
Coordinator of Rehab Services

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Function--
    - the specific, natural, or proper action or activity of anything

Functional limitation--
    - the inability to perform specific tasks and activities otherwise considered normal
Functional outcome--
    - a predicted result of care that is meaningful and practical to the athlete and sustainable beyond the rehabilitation environment
Functional testing & functional outcome measures

Purpose:

1. To determine an athlete's ability to successfully participate in activities
    a. "checkup" both for the practitioner and the athlete

2. To set a standard of unrestricted return to full athletics following ACL surgery

3. Provides data to assess treatment outcomes
    a. justification for third party payers
    b. what is working and what is not

4. Specific goals to work towards Considerations when designing / implementing:

  1. Reliability-- the degree to which a measure is consistent and free from error
  2. Validity-- does the test measure what it is supposed to measure
  3. Practicality-- method of administration, time required to administer the test, equipment required, special training for the examiners, and nature of the scoring system must all be considered
  4. Ability-- to discriminate between the presence or absence of a problem
Performance testing: * Can use unilateral (i.e. hopping tests) and/or bilateral (i.e. running tests)

* Provides objective assessment of components in a structured, controlled setting with minimal distractions - try and simulate their activity environment as closely as possible * Appropriate for that time in the athlete's rehab process - do not test a hopping component unless they have already been performing such a task * Adequate practice/test trials and rest intervals must be established Symmetry index: -Unilateral leg tests provide an opportunity to compare limbs. Time, distance, and accuracy data may be compared bilaterally. The symmetry index can be a useful tool for obtaining such measurements. It correlates into a percentage that the athlete is currently at and can be used as a goal to work towards. Asymmetry index less than 85% may be considered abnormal. Symmetry index= mean value / involved X 100%
                            mean value / uninvolved

Example: 34 in., 36 in., 38 in. on single leg hop involved = 36 in. mean
36 in., 40 in., 44 in. on uninvolved leg = 40 in. mean
36 / 40 = 0.9 X 100 = 90%

Considerations when reviewing results: * Must be concerned about substitution and compensatory actions - especially in a bilateral fashion (i.e. running at half speed and with bilateral guarding) * Be able to isolate deficit / dysfunction and institute a plan of correction * Overall endurance of athlete * Sport-specific skill * Psychological elements

* Logistical concerns - time of day, sleep, nutrition

The Stone Clinic

3727 Buchanan Street • San Francisco CA 94123 • info@stoneclinic.com • (415) 563-3110

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