Evaluate the collective function of references cited together in a given text segment.
Classify their combined role into one of the following categories: 'method', 'background', or 'result'.

Text:DAA cases were performed with a slight modification of the technique described by Lovell [15], with anterior capsulotomy and subsequent repair, the use of a standard operating table with a table mounted femoral elevator (Omni-Tract Surgical, St. Paul, Minnesota), selective soft tissue releases based on the mobility of the femur (conjoined tendon was released in most cases and piriformis was released in some), and the use of fluoroscopy in every case for assessing component positioning and limb-lengths.
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