Commentaries:
Jamieson, Fausset, and Brown
Apodosis to Job 31:13, Job 31:16-17, Job 31:19-21. If I had done those crimes, I should have made a bad use of my influence ("my arm," figuratively, Job 31:21): therefore, if I have done them let my arm (literally) suffer. Job alludes to Eliphaz' charge (Job 22:9). The first "arm" is rather the shoulder. The second "arm" is the forearm.
from the bone—literally, "a reed"; hence the upper arm, above the elbow.
Job affirms his freedom from unfairness towards his servants, from harshness and oppression towards the needy.
despise the cause—refused to do them justice.
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