Private equity firm Waud Capital Partners has acquired ProNerve LLC, which provides intraoperative neuromonitoring services, for an undisclosed amount.

Intraoperative neuromonitoring uses electro-physiological monitoring during surgical procedures to avoid nervous system injury.

ProNerve, headquartered in Denver, provides the monitoring services to hospitals and ambulatory surgery centers.

Chicago-based Waud Capital invests in companies with enterprise values between $30 million and $300 million. Its portfolio companies include Acadia Healthcare Co., the Center for Vein Restoration and Maxum Petroleum.