Module 73, Pediatric Orthopaedist Level

A 10 year old male was born at term without post natal problems. His walking was delayed until 2 years and 6 months of age. Medical treatment to this time has been observation with several short episodes of physical therapy aimed at stretching contracture at the knees. He is in grade five, doing well academically and lives on a farm where he is able to do most age appropriate farm tasks. At this time the family complains that he is walking more with his knees flexed and his knees rub together. He had two episodes of inhibitive casting for the hamstring contractures which the family says only caused pain with no benefit. Now at age 14, the family seeks a new opinion because in the last year it has become more difficult for him to walk. His knees rub together to the point of developing contusions from the direct contact. After working on the farm or walking long distances he was having increasing right knee pain. He has never had hip pain. X-rays of the hips and knees were obtained. He walks with both knees hitting in swing phase, left pelvis posterior, and stiff knee on the left. (___k, mpg)

TEST              Passive ROM   Strength  Spasticity Motor Control  Comments 


                     Rt    LT    Rt   LT   Rt   LT   Rt    LT                       
Hip Flexion          120   115   4    5    1    1    yes   yes                      
hip abduction (EXT   25    22    4    3    4    0    yes   yes                      
KN))                                                                                
Hip extension        8     0     5    5              yes   yes                      
Hip Int Rotation     40    55                                                       
(EXT)                                                                               
Hip ext Rotation     25    15                                                       
(EXT)                                                                               
Thomas test          23    18                                                       
Knee extension       -9    5     5    5    4    3    yes   yes   Rectus spasticity  
Knee Flexion         135   145   5    4    1    2    yes   yes                      
Knee reflex                                2    3                                   
Popliteal angle      70    70                                                       
Ely Test             85    85                                                       
Ankle Dorsiflexion   8     0                                     With knee Flexion  
Ankle dorsiflexion   3     -10   5    4              yes   no    With Knee          
                                                                 Extension'         
Ankle Plantar        35    50    4    5    3    1    yes   yes                      
flexion                                                                             
Foot inversion       45    40    5    5    3    3    yes   yes   Tibialis           
                                                                 Posterior          
Foot eversion        33    -5    5    5              yes   yes   Perineals          
Thigh Foot angle     e-35  e-10                                  done with knee     
                                                                 flexed             
Babinski                                             no    no                       
Clonus                                     5    12                                  
                                           bts  bts                                 
Standing GMFM                                                    32 of 36           
                                                                 possible points    
Leg length measured  87.5  87                                    Measured supine    







Kinematic Charts:

The major findings on the kinematic were slow speed, normal cadence, and symmetrical but short step lengths.


Characteristic:                        Trial        Normal       % Normal

TEMPORAL CHARACTERISTICS:                                                          
Velocity, cm / sec                      91.3        120.0           76.1      
Cadence, steps / min                   118.0        122.0           96.7   
Stride Time, sec                         1.0          1.0          101.7
SPATIAL CHARACTERISTICS:                                                           
Stride Length, cm                       92.8        119.0           78.0       
Right Step Length, cm                   47.7         59.4           80.3    
Left Step Length, cm                    45.1         59.4           76.0     
Step Width, cm                          17.1         12.0          142.7  
Pelvic Width / Ankle Spread Ratio       0.98          2.0           48.9





The pelvis was rotated leading with the right forward 5 to 30 degrees . The left hip was adducted 5 to 25 degrees and internally rotated 20 degrees. the right was externally rotated 10 degrees . The right knee had increased mid-stance flexion of 30 degrees and good flexion in swing. The left had flatted and decreased swing flexion and both had increased knee flexion at foot contact at 35-40 degrees. The right tibia demonstrated valgus of 25 degrees and external rotation of 20 degrees. Dorsiflexion of the right ankle was good but plantar flexion was limited to neutral. The left had limited dorsiflexion coming only to neutral. Foot progression on the right was external 20-30 degrees and on the left was internal 5 degrees .


EMG Charts:

The recording of the Rectus muscle shows significant swing phase activity bilaterally and very minimal stance activity. Both hamstring muscles show significant constant activity but do have additional activity early stance phase . Tibialis anterior muscle has predominantly early swing phase activity with significant underlying constant activity. The right gastrocnemius has predominantly stance activity with good late stance phase contraction. The left gastrocnemius has no recognizable pattern .


Question 73A

A derotation osteotomy of the left femur is definately indicated.


Question 73B

The right tibia has 35 degrees of external torsion which is a major cause of the knee valgus. Both of these can be corrected through a proximal tibial osteotomy.


Question 73C

One option would be to do a external rotation femoral osteotomy on the left and a proximal tibial osteotmy on the right. It would be important to do the femur first.


Question 73D

Reconstruction of the left hip to gain good reduction and acetabular coverage will require a pelvic osteotomy like a Dega. The indication for reconstructing this hip remain unclear.


Question 73E

Based on the data above this boy needs a tnedon achilles lengthening on the left in addition to the right knee and left hip procedure. This is all that will be needed at this surgical event.


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