Source: Tafsir al-Ahlam al-Kabir (Ibn Sirin)
The knee in a dream is a man's toil and striving in his work. Pain in it indicates fatigue in seeking sustenance.
Source: Ta'tir al-Anam fi Ta'bir al-Manam (Al-Nabulsi)
The knee indicates a partner in work. Whatever happens to it reflects on him.
Source: Al-Isharat fi Ilm al-Ibarat (Ibn Shahin)
The knee is interpreted as wealth. Its strength is the strength of wealth, and its weakness is its weakness.