What the Bible says about Withered Hand
(From Forerunner Commentary)
The man Christ healed is described as having a "withered hand." With professional accuracy, Luke alone tells us that it was his right hand, as ancient medical writers always noted whether the right or the left was affected. Since most people are right-handed, his right hand was especially important to him since he likely needed it to work. In addition, only the man's hand was withered or shriveled, not his whole arm, apparently the result of paralysis due to some accident or disease rather than a congenital deformity.
He was in the right place—where he should have been—on the Sabbath day. If he had stayed home that day, would he have had this wonderful opportunity to be healed? The same principle holds true regarding our own Sabbath attendance with others of God's church, when possible. If we fail to attend the commanded "holy convocation" on the Sabbath, we may miss out on the spiritual healing God provides through the inspired messages from His Word, as well as the encouragement of the brethren to press on in faith and obedience to God. As the author of Hebrews writes:
And let us consider one another in order to stir up love and good works, not forsaking the assembling of ourselves together, as is the manner of some, but exhorting one another, and so much the more as you see the Day approaching. (Hebrews 10:24-25)
Martin G. Collins
The Miracles of Jesus Christ: Healing a Withered Hand (Part One)