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MYSTERY OF KNEE PAIN:
Black Hole Of Orthopedics:
Patellofemoral Joint
Dr.Sandeep Agrawal
Consultant Orthopedic Surgeon
MS,DNB
Agrasen Hospital
Gondia
Maharashtra
India
drsandeep123@gmail.com
Patella contact area
• At full extension, the distal
portion of the patella is in
contact with the superior
portion of the trochlea
• As knee flexion, the contact
area moves proximately
• Contact area increases from
0.8 cm2 at knee full
extension to 4 cm2 at 90º of
flexion (Hehne, 1990)
Patella contact area
Goodfellow J, Hungerford DS, Zindel M. Patellofemoral joint mechanics and pathology
J Bone Joint Surg (Br) 1976; 58-B: 287-290
20° 45° 90° 135°
• Lateral tilt and displacement of
patella: considered characteristic
features of patellofemoral pain
syndrome
• Suggested that : abnormal
patellar tilt and displacement
…detected best with the knee
near full extension, before the
patella becomes engaged in the
trochlear groove. which
requires CT or MRI
Patellofemoral Disorders
5
Patellofemoral Pain:Black
Hole:
6
Theories:
7
Sources of Pain:
Common Causes of Patellofemoral
Pain
1. Muscular
• Excessive muscle tightness (inflexibility),
rapid teenage growth or poor conditioning
• Fatigue or tearing(strain) of quadriceps or
hamstring muscles ,
• Muscular strength imbalances,
• Overuse/disuse :
bending overuse,
too aggressive in starting a fitness program
runners and athletes that over train
Common Causes of Patellofemoral
Pain
2. Structural damage
patella arthritis, stress fracture, direct
traumatic injury
Common Causes of Patellofemoral
Pain
3. Congenital dysplasia
patella alta(high patella), facet or
trochlear dysplasia
Common Causes of Patellofemoral
Pain
4. Malalignment
tilted patella, intoeing rotation of
the legs(persistent femoral
anteversion) knock knee
(excessive valgus deformity)
Common Causes of Patellofemoral
Pain
5. Instability of the patella :
Maltracking with subluxation(partial) or
complete dislocation of the knee cap:
Damaged or stretched ligament support
Acute dislocation After repair
Common Causes of Patellofemoral
Pain
6. Inflammatory : Bursitis,Tendinitis
Jumper’s knee: Patella tendinitis results from
excessive overload or overuse of the extensor
mechanism of the knee
7. Synovial plica
Radiographic Measures in
Subjects Who Are Asymptomatic and
Subjects With Patellofemoral Pain Syndrome
CORR (414) 2003,p172
lateral patellar angle congruence angle Caton’s ratio B/A
35° knee flexion
unloaded or loaded
There is no significant abnormal patellar alignment
detectable in subjects with patellofemoral pain
syndrome at 35° knee flexion
It is possible that the patellar malpositioning in
subjects with patellofemoral pain syndrome is too
subtle to be measured at one static imaging angle
Lateral
tubercle
deviation
Tibial tubercle lateralization
greater than 10 mm and a
lateral patellofemoral angle
less than 8° were predictive
of anterior knee pain with a
specificity of 95% and a
sensitivity of 64%
Arthroscopy June 2006 • Volume 22 • Number 6
Patellofemoral Pain Syndrome
• Overuse ????
• Neurogenic factors ???
• To think of anterior knee pain or patellar
instability as somehow being necessarily
tied to PFM [patellofemoral
malalignment] is an oversimplification
that has positively stultified progress
toward better diagnosis and treatment
Patellofemoral Pain Syndrome
• Malalignment of the extensor mechanism
:probably has a role in the multifactorial
pathogenesis of patellofemoral pain and
altered patellofemoral biomechanics.
• Contribution of extensor mechanism
malalignment to patellofemoral pain and
altered biomechanics may change on the
basis of the frequency and magnitude of
physiological weight-bearing and non-weight-
bearing loading conditions
19
Message:
Qualities of A Doctor
21
THANK YOU

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Mystery of Knee pain Black Hole of Orthopedics- Patellofemoral joint dr.sandeep c agrawal agrasen hospital gondia india

  • 1. MYSTERY OF KNEE PAIN: Black Hole Of Orthopedics: Patellofemoral Joint Dr.Sandeep Agrawal Consultant Orthopedic Surgeon MS,DNB Agrasen Hospital Gondia Maharashtra India drsandeep123@gmail.com
  • 2. Patella contact area • At full extension, the distal portion of the patella is in contact with the superior portion of the trochlea • As knee flexion, the contact area moves proximately • Contact area increases from 0.8 cm2 at knee full extension to 4 cm2 at 90º of flexion (Hehne, 1990)
  • 3. Patella contact area Goodfellow J, Hungerford DS, Zindel M. Patellofemoral joint mechanics and pathology J Bone Joint Surg (Br) 1976; 58-B: 287-290 20° 45° 90° 135°
  • 4. • Lateral tilt and displacement of patella: considered characteristic features of patellofemoral pain syndrome • Suggested that : abnormal patellar tilt and displacement …detected best with the knee near full extension, before the patella becomes engaged in the trochlear groove. which requires CT or MRI Patellofemoral Disorders
  • 8. Common Causes of Patellofemoral Pain 1. Muscular • Excessive muscle tightness (inflexibility), rapid teenage growth or poor conditioning • Fatigue or tearing(strain) of quadriceps or hamstring muscles , • Muscular strength imbalances, • Overuse/disuse : bending overuse, too aggressive in starting a fitness program runners and athletes that over train
  • 9. Common Causes of Patellofemoral Pain 2. Structural damage patella arthritis, stress fracture, direct traumatic injury
  • 10. Common Causes of Patellofemoral Pain 3. Congenital dysplasia patella alta(high patella), facet or trochlear dysplasia
  • 11. Common Causes of Patellofemoral Pain 4. Malalignment tilted patella, intoeing rotation of the legs(persistent femoral anteversion) knock knee (excessive valgus deformity)
  • 12. Common Causes of Patellofemoral Pain 5. Instability of the patella : Maltracking with subluxation(partial) or complete dislocation of the knee cap: Damaged or stretched ligament support Acute dislocation After repair
  • 13. Common Causes of Patellofemoral Pain 6. Inflammatory : Bursitis,Tendinitis Jumper’s knee: Patella tendinitis results from excessive overload or overuse of the extensor mechanism of the knee 7. Synovial plica
  • 14. Radiographic Measures in Subjects Who Are Asymptomatic and Subjects With Patellofemoral Pain Syndrome CORR (414) 2003,p172 lateral patellar angle congruence angle Caton’s ratio B/A 35° knee flexion unloaded or loaded
  • 15. There is no significant abnormal patellar alignment detectable in subjects with patellofemoral pain syndrome at 35° knee flexion It is possible that the patellar malpositioning in subjects with patellofemoral pain syndrome is too subtle to be measured at one static imaging angle
  • 16. Lateral tubercle deviation Tibial tubercle lateralization greater than 10 mm and a lateral patellofemoral angle less than 8° were predictive of anterior knee pain with a specificity of 95% and a sensitivity of 64% Arthroscopy June 2006 • Volume 22 • Number 6
  • 17. Patellofemoral Pain Syndrome • Overuse ???? • Neurogenic factors ??? • To think of anterior knee pain or patellar instability as somehow being necessarily tied to PFM [patellofemoral malalignment] is an oversimplification that has positively stultified progress toward better diagnosis and treatment
  • 18. Patellofemoral Pain Syndrome • Malalignment of the extensor mechanism :probably has a role in the multifactorial pathogenesis of patellofemoral pain and altered patellofemoral biomechanics. • Contribution of extensor mechanism malalignment to patellofemoral pain and altered biomechanics may change on the basis of the frequency and magnitude of physiological weight-bearing and non-weight- bearing loading conditions
  • 20. Qualities of A Doctor