GAIT ANALYSIS AFTER THR

GAIT ANALYSIS AFTER THR

• after hip replacement – even though pain free – gait may not be normal compared to the age group
  • walking ability may be reduced
  • may avoid weight bearing on affected limb
• gait analysis after thr done – after 6 months
  • gait symmetry, stride length, double support time etc. improve only by that time

• decreased walking ability is denoted by reduced frequency
• gait cycle duration – time elapsed in single gait cycle – increased
  • denotes that person is doing more postural adjustment while walking
• right and left foot parameters – measured by assessing step time parameters – is not symmetric
  • as both hips do not equally share weight bearing

Step time parameters

• shows both duration of weight bearing of a particular limb and the duration when the limb is off the ground
• single support time, step time, statue time are reduced
• single swag time, double support time are increased
• due to avoiding weight bearing on that limb and keep that limb mostly off the ground
• increased double support time – means when the patient bears weight on affected side the contra lateral limb supports it

Ground reaction force

• ground reaction force curves measures the unequal limb loading
• this is quantified by comparing with affected and normal limb – and also with the same in healthy persons
• first and second vertical force peaks were less on affected legs – than on normal leg or healthy persons
  • shows patient puts weight on the affected leg in protected manner
• time to first peak was delayed on affected leg
  • means patient do not put weight on the affected leg as quickly as on normal limb
• loading rate was less – push off rate was more on affected limp
  • means the patient wants to switch over to the normal limb as quickly as possible
• so even if pain free – patient adopt a gait according to their weight bearing ability
  • do not reach the normal gait
• this leads to the additional stress on normal limb – leading to development of osteoarthritis and severe cartilage degeneration of knee and hip
• prosthetic joints designed for normal gait – abnormal gait patterns accelerate wear and tear – leads to failure
• normal gait patterns should be trained and encouraged in all thr patients
• also pre operative gait patterns also should be taken into consideration

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