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Medial meniscus injury. Function of menisci. Acts as the shock absorber Helps the knee in locking mechanism Assists and controls gliding and rolling motion of the knee Contributes towards the stability of the knee joint Weight transmission. Medial meniscus injury .

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Presentation Transcript
function of menisci
Function of menisci
  • Acts as the shock absorber
  • Helps the knee in locking mechanism
  • Assists and controls gliding and rolling motion of the knee
  • Contributes towards the stability of the knee joint
  • Weight transmission
medial meniscus injury7
Medial meniscus injury
  • Medial meniscus is more commonly injuried than the lateral and is usually associated with other ligament injuries of the knee.
  • Lateral meniscus is less common :

- because it is smaller in diameter , thicker in periphery , wide , more mobile and attached to both cruciate ligament.

mechanism of injury
Mechanism of injury
  • Rotational force when a flexed knee extends
  • In young : it can occur only when weight is being taken , knee is flexed and there is a twisting strain. Young active athletes
  • In middle life : fibrosis has decreased the mobility of meniscus and hence tear occurs with less force
slide9
Features medial meniscus

Shape - semicircular

Anterior horn - attached to tibial intercondylar eminence in front ACL

Posterior horn – intercondylar area in front of PCL and behind posterior horn of lateral meniscuc

Mobility - less mobile

Lateral meniscus

- circular

- attached to tibial

intercondylar eminence lateral to ACL

To the intercondylar eminence

more mobile

classification based on their tear patterns
classification based on their tear patterns : -

Diagram of meniscal tear patterns: (A) Vertical or longitudinal (Bucket-handle), (B) Flap or Oblique, (C) Radial or Transverse, (D) Horizontal, (E) Complex degenerative

most common symptoms
Most common symptoms
  • Knee pain
  • Swelling of the knee
  • Tenderness when pressing on the meniscus
  • Popping or clicking within the knee
  • Limited motion of the knee joint
signs
Signs
  • Locking +ve
  • McMurray`s test +ve
  • Apley`s test +ve
  • Duck waddle test +ve
  • Steinmann`s sign +ve
  • Quadriceps atrophy +ve
  • Medial joint line tenderness +ve
slide14

Figure 5. The McMurray test Is performed by flexing the patient's hip and knee and palpating for a pop or click along the joint line as the tibia is internally and externally rotated

figure the apley test
Figure : - The Apley test

Apley`s distraction test

Apley`s compression test

slide16

Figure 4. The Steinman test produces joint line pain when the tibia is rotated internally and externally while the knee is flexed over the examination table