draw-back of the described technique is the possible interference with obturator nerve function as was suspected in case 2.
Cadaver studies have shown relative close proximity of the obturator nerve origin near the targeted area (C. De Vlamynck et al., unpublished observations).
Accurate deposition of a small volume of anaesthetic solution might overcome this complication.
Injection accuracy might be enhanced by the use of a peripheral nerve stimulator in which the insulated needle is both used to stimulate the targeted nerve and to deliver the local anaesthetic (Campoy et al.,
2010; Echeverry et al., 2010; Viel et al., 2005), but this technique requires general anaesthesia and is thus impractical for a diagnostic technique which requires a conscious and ambulatory patient.
Moreover, Tran de et al. (2008) found no substantial benefits of using stimulating perineural catheters on the efficiency of a neuronal block in comparison to blinded or ultrasound-guided techniques.
Nevertheless, further validation of the technique is necessary before widespread use in a clinical setting allows objective evaluation in 100% of cases.