A prospective study of the use of transcutaneous neural stimulation (TNS) in 90 arthroscopic knee surgery patients was performed to determine: (1) of TNS is as effective as traditional pain medication in treating postoperative knee pain; and (2) if patients that had received TNS regain preoperative motion and strength quicker than the control population. The patients were divided into three equal groups. Group I consisted of patients with no TNS unit, group II had a "placebo" unit, and group III had a "live" unit. Preoperatively, each patient received an isokinetic muscle examination, orientation to the TNS unit, leg circumference measurements were repeated at 1, 3 and 7 weeks postoperatively. Additionally, the amount of pain and medication required was analysed. The results of the study indicated the use of a TNS unit is an effective adjunct in decreasing postoperative pain in 93% of patients. The amount of pain and total pain medication required was greatest in the control group, less in the placebo, and markedly reduced in the TNS group. A comparison among the three groups revealed that the TNS group regained the following preoperative values 1 month sooner than the other two groups (3 as opposed to seven weeks postoperatively): isokinetic power in flexion and extension (p < 0.05), range of motion (p < 0.02), and leg volume (p < 0.05). There was no correlation between the pain and irregular wave forms on the isokinetic graph. The only complication noted was skin irritation at the electrode sites. TNS has been shown to be a significant benefit in the treatment of postoperative knee pain and in hastening recovery of muscular function through a full range of motion.

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