What is the ruling on a garment if it extends below the inner ankle but not below the outer ankle, and is this considered among the prohibited forms of Isbal (letting one's garment hang below the ankles)?

The meaning of "al-ka'bayn" (the two anklebones) in the hadith prohibiting Isbal (letting one's garment hang below the ankles) refers to the two elevated anklebones at the joint of the shin and foot, which are the two protruding bones.