TT Gait Deviations

Question 1

Initial Contact

Heel Strike

Answer 1

• instant when heel comes in contact with ground
  GOALS: 5-10 degrees of knee flexion and step length equal to sound

Question 2

Initial Contact

Deviation: Knee FUlly extended

Answer 2

• faulty suspension
• insufficient socket flexion
• foot too anterior

Question 3

Initial Contact

Deviation: Excessive Knee Flexion

Answer 3

• faulty suspension
• flexion contracture

Question 4

Initial Contact

Deviation: Unequal Step Length

Answer 4

• Faulty suspension
• Patient cause (pain, fear, etc)

Question 5

Loading Response

Answer 5

• the knee is in slight flexion at heel strike
• stance phase knee flexion: to control quads eccentrically contract

Question 6

Loading Response

Knee Remains Extended

Answer 6

• heel too soft
• PF bumper too soft
• heel lever too short (socket too posterior, foot too anterior)
• insufficient socket flexion; excessive ankle PF
• shoe heel height lower than foot heel height
• excessive activation of knee or hip extensors

Question 7

Loading Response

Abrupt Knee Flexion in Loading Repsonse

Answer 7

• Heel too stiff
• PF bumper to firm
• heel lever too long (socket too anterior, foot too posterior)
• excessive socket flexion, excessive ankle DF
• shoe heel height higher than foot heel height

Question 8

Midstance

Goals

Answer 8

• vertical pylon in coronal
• slight varus moment
• no lateral trunk leaning

Question 9

Midstance

Excessive Varus Moment

Answer 9

• Foot too inset
• excessive socket ABduction
• medial aspect of foot leaving ground

Question 10

Midstance

Excessive Valgus Moment

Answer 10

• foot too outset
• excessive socket Adduction
• antalgic gait

Question 11

Terminal Stance Goals

Answer 11

• sufficient forefoot leverage to maintain weight bearing until contralateral weight acceptance
• prevention of excessive knee extension
• smooth heel off

Question 13

Terminal Stance

Excessive extension moment

Hill climbing

Answer 13

• foot too anterior
• insufficient socket flexion
• foot too plantar flexed
• keel to rigid
• foot too long
• heel of shoe too low
• weak quads

Question 14

Terminal Stance

Abrupt Knee Flexion

Drop off

Answer 14

• foot too posterior
• socket too flexed
• foot too DF
• keel too soft
• foot too short
• heel of shoe too high