The plaintiff claimed that our client, an orthopedic surgeon, was negligent (directly or circumstantially under a theory of res ipsa loquitur) in causing a right common peroneal nerve injury during a L4-5 laminectomy and posterior spinal fusion. The plaintiff sought to prove that the peroneal nerve injury was the result of improper positioning and/or monitoring of the plaintiff intra-operatively. Our defense was that the plaintiff’s peroneal nerve condition was indicative of a spontaneous entrapment unrelated to the allegations of negligence, and for which she was predisposed due to a prior total knee replacement. The arbitrator agreed and returned a finding of no negligence.