GAIT ANALYSIS AFTER THR - DNB Orthopaedics MS Orthopedics MRCS Exam GUIDE -

DNB Orthopaedics  MS Orthopedics  MRCS Exam GUIDE -

Orthopaedic Guidance for DNB Orthopaedics,MS Orthopaedics and Mrcs exams.Cme courses for orthopaedic surgeons.Davangere notes,solved question papers.DNB Ortho,MS Ortho MRCS,Exam Guide videos and notes 9087747888


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Sunday 1 April 2018



  • 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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