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Related Concept Videos

Alterations in Muscle Tone ll01:12

Alterations in Muscle Tone ll

Alterations in muscle tone are common manifestations of neurological disorders and reflect dysfunction within different nervous system regions. Spasticity, paratonia, and dystonia represent distinct forms of hypertonia, each with unique mechanisms, clinical features, and diagnostic importance.CharacteristicsSpasticity happens from upper motor neuron lesions and is characterized by velocity-dependent resistance to passive movement. Clinical features include:Exaggerated deep tendon reflexesClonus...
Alterations in Muscle Tone lll01:11

Alterations in Muscle Tone lll

Rigidity and myotonia are distinct abnormalities of muscle tone that affect resistance and relaxation during movement. Although both involve altered muscle contraction, they arise from different neurological and muscular mechanisms.CharacteristicsRigidity is characterized by uniform resistance to passive movement across the entire range, independent of speed, affecting flexors and extensors equally. It may appear as lead-pipe rigidity (smooth, constant resistance) or cogwheel rigidity...
Constraints and Statical Determinacy01:26

Constraints and Statical Determinacy

In structural engineering, the equilibrium of a system is not only determined by its equations of equilibrium but also with the help of constraints. Constraints refer to restrictions on the motion of a system. The proper combinations of constraints can minimize the total number of constraints needed to maintain a system in mechanical equilibrium. When this happens, the system is said to be statically determinate. For such systems, the unknown reaction supports can be estimated using equilibrium...
Statically Indeterminate Problem Solving01:16

Statically Indeterminate Problem Solving

Statically indeterminate problems are those where statics alone can not determine the internal forces or reactions. Consider a structure comprising two cylindrical rods made of steel and brass. These rods are joined at point B and restrained by rigid supports at points A and C. Now, the reactions at points A and C and the deflection at point B are to be determined. This rod structure is classified as statically indeterminate as the structure has more supports than are necessary for maintaining...
Static Equilibrium - I01:05

Static Equilibrium - I

A rigid body is said to be in dynamic equilibrium when both its linear and angular acceleration are zero, relative to an inertial frame of reference. This means that a body in equilibrium can be moving, but only when its linear and angular velocities are constant. A rigid body is said to be in static equilibrium when it is at rest in the selected frame of reference. The distinction between static equilibrium (e.g., a state of rest) and dynamic equilibrium (e.g, a state of uniform motion) is...
Static Equilibrium - II01:07

Static Equilibrium - II

Static equilibrium is a special case in mechanics that is very important in everyday life. It occurs when the net force and the net torque on an object or system are both zero. This means that both the linear and angular accelerations are zero. Thus, the object is at rest, or its center of mass is moving at a constant velocity. However, this does not mean that no forces are acting on the object within the system. In fact, there are very few scenarios on Earth in which no forces are acting upon...

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Related Experiment Video

Updated: Jul 10, 2026

Repeated Transcranial Magnetic Stimulation Combined with Action Observation Training in Children with Spastic Cerebral Palsy
07:20

Repeated Transcranial Magnetic Stimulation Combined with Action Observation Training in Children with Spastic Cerebral Palsy

Published on: August 9, 2024

Static and dynamic problems in spastic cerebral palsy.

J Reimers1

  • 1Orthopaedic Hospital and the Clinic for Handicapped Children, Rigshospital, Copenhagen, Denmark.

Ortopedia, Traumatologia, Rehabilitacja
|November 7, 2007
PubMed
Summary
This summary is machine-generated.

Surgical release of hip, knee, and ankle contractures in spastic cerebral palsy (CP) is crucial. Optimal results for sitting, standing, and walking in CP patients are achieved through timely and sequential correction of all contractures.

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Repeated Transcranial Magnetic Stimulation Combined with Action Observation Training in Children with Spastic Cerebral Palsy
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Area of Science:

  • Orthopedic surgery
  • Neurology
  • Rehabilitation medicine

Background:

  • Spastic cerebral palsy (CP) significantly impacts mobility due to joint contractures.
  • Contractures in the hip, knee, and ankle joints are common in CP patients.
  • Suboptimal surgical outcomes in CP are frequently reported.

Purpose of the Study:

  • To analyze static and dynamic conditions in spastic cerebral palsy.
  • To determine the optimal surgical sequence for contracture release in CP.
  • To improve functional outcomes and reduce cosmetic defects in CP patients.

Main Methods:

  • Analysis of static and dynamic conditions in patients with spastic cerebral palsy.
  • Evaluation of surgical interventions for contracture release.
  • Review of patient outcomes following orthopedic surgery.

Main Results:

  • Contractures should be released sequentially from above downwards (hip, knee, ankle).
  • Full functional benefit is achieved only when all contractures are corrected.
  • Mobilization of joints through contracture release significantly improves sitting, standing, and walking.
  • Inadequate or delayed surgical intervention leads to poor outcomes in CP patients.

Conclusions:

  • Timely, sequential, and complete surgical release of contractures is essential for optimal outcomes in spastic cerebral palsy.
  • Orthopedic surgery for CP contractures should be performed early and in the correct sequence.
  • Addressing contractures comprehensively improves patient mobility and reduces functional limitations.