Knee Protesting Theory

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Proprioception is defined as the “cumulative neural input to the CNS from mechanoreceptors in the joint capsule, ligaments, muscles, tendons and skin” (Beard et al 1993). There is loss of both stability and proprioception in the knee following an injury to the anterior cruciate ligament (ACL) (Barrett DS 1991). The afferent nerves are responsible for proprioception arise from the ligaments, capsules surrounding muscles and skin (Grigg P et al 1982) activating muscle contraction, which may be assumed to help stabilise the joint (Schultz RA et al1984). Injuries, including ACL tears, are likely to disrupt this process.
Spinal motor neuron receives afferent information from both ipsilateral and contralateral limbs (Cuadrado ML et al 1999). In the cerebral motor cortex cross-connections between
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Patients may participate in a pretesting rehabilitation program until these impairments are resolved. The criteria used to determine readiness for testing include the following: (1) no evidence of joint effusion (2) full passive knee range of motion (3) full extension during a straight leg raise on the involved limb (4) quadriceps femoris maximum voluntary contraction force on the involved limb equivalent to 75% of that the uninvolved limb (5) tolerance for single-leg hopping on the involved limb without pain. (G.Kelly Fitzgerald et al 2000)

Test Procedures and Criteria for patient selection
The patient selection process included 4 tests administered in the following order: (1) single, cross-over, triple and timed hop test 80% or more of the uninjured limb (2) Knee outcome survey activities of daily living scale score of 80% or more (3) Global rating of knee function of 60% or more (4) no more than 1 episode of giving way. (G.Kelly Fitzgerald et al

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