The words have similar meaning but I personally like the NKJV translation where it uses "discern the body" rather than "judge the body." To judge sounds more like pronouncement of a opinion where as to discern refers to a special ability to recognize something. By accurately discerning something one has the ability to make a proper judgement. I hope you see my logic. Without the aid of the Holy Spirit one does not have the ability to recognize/discern Jesus Christ as the Son of God nor His finished work. That's why it would be meaningless to participate in the Lord Supper without having a saving faith.
Unworthy participation is not meaningless. The unworthy eat and drink judgment to themselves. Many of them become weak, sick, and many die.
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In addition to the individual's responsibility to "discern the body" the elders are given the responsibility to "fence the table" from those who are unbelievers. So that only those who have professed their faith publicly and remain in good standing with Christ's church can take part in this holy meal. There can be no union or communion with God (or His Church) without the endowment of the Holy Spirit.
1 Cor. 11:18-22 goes beyond that. There must be no divisions. The elders, as stewards of the mystery, examine the communicants for a unity of faith. How can certain Reformed churches (e.g., Anglican) admit Transsubstantionists, Calvinists, and Zwiglians without discrimination? Do they all discern the Lord's body in the same way?
