Gait Cycle and Analysis

Gait refers to the pattern of walking produced by the coordinated activity of muscles, bones, joints and the nervous system. Analysis of gait is an important component of orthopaedic evaluation because abnormalities in walking pattern often indicate underlying musculoskeletal or neurological disorders.

The gait cycle describes the sequence of events that occur between two successive contacts of the same foot with the ground. Understanding the phases of the gait cycle allows clinicians to analyze abnormalities in walking and determine the underlying biomechanical causes.

Gait analysis is widely used in orthopaedics, rehabilitation medicine, neurology and sports medicine. It helps in diagnosing conditions such as limb length discrepancy, muscle weakness, joint deformities, nerve injuries and cerebral palsy.

Several terms are commonly used when describing normal walking mechanics.

These parameters are useful in quantitative gait analysis and help clinicians assess functional mobility.

The gait cycle is divided into two major phases: the stance phase and the swing phase.

• Stance phase accounts for approximately sixty percent of the gait cycle
• Swing phase accounts for approximately forty percent of the gait cycle

During the stance phase the foot remains in contact with the ground. During the swing phase the limb moves forward in preparation for the next step.

The stance phase can be further divided into several functional stages that occur sequentially.

These stages allow efficient transfer of body weight during walking.

The swing phase is also divided into stages representing the movement of the limb through the air.

The determinants of gait are biomechanical features that minimize energy expenditure during walking. These mechanisms allow efficient forward movement while maintaining stability.

• Pelvic rotation
• Pelvic tilt
• Knee flexion during stance
• Foot and ankle mechanism
• Controlled lateral displacement of pelvis
• Vertical displacement of the body center of gravity

Together these determinants reduce vertical oscillation of the body and make walking more energy efficient.

Muscle groups play specific roles at different phases of the gait cycle.

Proper coordination of these muscle groups ensures smooth and efficient walking.

Several characteristic gait abnormalities occur in orthopaedic and neurological disorders.

• Antalgic gait due to pain
• Trendelenburg gait due to hip abductor weakness
• Steppage gait due to foot drop
• Spastic gait in upper motor neuron lesions
• Waddling gait in muscular dystrophy

Identification of these abnormal patterns helps clinicians determine the underlying pathology.

Gait analysis can be performed through several methods depending on clinical requirements.

• Observational gait analysis
• Video based motion analysis
• Force plate analysis
• Electromyography
• Three dimensional motion capture systems

Advanced gait laboratories combine these technologies to study complex movement patterns.

Understanding gait mechanics is essential in orthopaedic practice. Many musculoskeletal conditions alter normal walking patterns, and careful gait analysis helps identify functional impairments.

Gait analysis is particularly useful in evaluating limb length discrepancies, joint deformities, neuromuscular disorders and postoperative rehabilitation following orthopaedic procedures.