Concluded Case

Why only VMO goes into dystrophy after injury early?

Why VMO undergoes early dystrophy following any injury to knee joint? The two parts of Vastus medialis muscle i.e. VMO AND VML- whether both the part undergo dystrophy or only VMO. Please discuss the reason behind this.

(Edited)

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Concluded answer
Vastus medialis( quadriceps ) is an anti gravity muscle. Since most of the time we are standing, in order to keep us in erect posture, quadriceps are in tonic contraction to keep the knee joint locked in extension. Therefore the tone and the bulk of muscle is maintained. Injury to knee joint disrupts the proprioceptive impulses coming to the quadriceps. The immobilization following knee joint injury takes away the anti gravity action of quadriceps. These factors make the muscle atrophy
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Vastus medialis( quadriceps ) is an anti gravity muscle. Since most of the time we are standing, in order to keep us in erect posture, quadriceps are in tonic contraction to keep the knee joint locked in extension. Therefore the tone and the bulk of muscle is maintained. Injury to knee joint disrupts the proprioceptive impulses coming to the quadriceps. The immobilization following knee joint injury takes away the anti gravity action of quadriceps. These factors make the muscle atrophy
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As we all know that anterior thigh has a four muscles (Quadriceps) but out of four only Vastus Medialis Oblique (VMO) get weak in any lower limb conditions. And in physiotherapy we are more focus on only VMO muscle.. However, with knee joint effusion there maybe arthrogenic muscle inhibition.
Common reasons for a weak vastus medialis oblique (VMO) include knee injury, post-surgery, swelling or disuse. The longstanding tightness of your lateral knee structures (lateral retinaculum, VL, and ITB) will encourage your kneecap to drift sideways over time. Especially, if your VMO is also weak.
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Reflex inhibition of muscle is known to be the cause of quadriceps wasting in knee conditions. Markedly in vastus medialis obliques. Isometric quadriceps exercises and VMO by last few degrees of extension is advisable
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