Motor Point Block Procedure for Hamstring Spasticity

Primary Recommendation

The American College of Physicians recommends botulinum toxin injection as the first-line treatment for hamstring spasticity, targeting specific motor point zones to achieve optimal spasticity reduction and pain relief, due to its strong evidence base and superior safety profile 1

Patients with focal spasticity in hamstrings that is painful, impairs function, reduces rehabilitation participation, or compromises positioning/skin care should be considered for botulinum toxin injection, according to the American Academy of Physical Medicine and Rehabilitation 1
The American Academy of Neurology recommends documenting specific functional impairments, such as gait disturbance, difficulty with positioning, and pain during passive movement, to assess the severity of hamstring spasticity 3
The American College of Physicians suggests verifying failure or intolerance of first-line non-pharmacological approaches, including stretching, range of motion exercises, and splinting, before considering botulinum toxin injection 2

The American Academy of Physical Medicine and Rehabilitation recommends a treatment algorithm that starts with non-pharmacological approaches, followed by botulinum toxin motor point injections, and considers phenol blocks as an alternative, with intrathecal baclofen reserved for refractory cases 2

The American Academy of Neurology suggests assessing outcome at 4-6 weeks after botulinum toxin injection, including reduction in Modified Ashworth Scale score, decreased pain during passive movement, and improved passive range of motion, to evaluate treatment efficacy 3