Yes
No
If you have weakness in your knee that is usually worse during sideways motion, you may need additional medial/lateral support. Additionally, ligament injuries, such as injuries to the Medial Collateral Ligament or Lateral Collateral Ligament will usually require further medial or lateral stabilization.
You are most likely to require additional medial or lateral support if you are at the start of your rehabilitation journey (before injured structures are strong enough for normal movement), or in late-stage degeneration from conditions, such as arthritis.
Medial support would be additional support for the inside side of your knee, lateral support would be additional support for the outside side of your knee. For example, for your right knee, medial support would be on the left-hand side and lateral support would be on the right-hand side. In supports and braces, additional medial and lateral support is usually provided
by stays that extend down the side of the support or brace.
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