Price of revenues was $8.september 30 6 million for the three months ended, 2013, as compared to $7.4 million for the same period in 2012. The increase is related to the assistance costs to support brand-new and expanded recurring assistance contracts and the upsurge in new tools placed. Gross profit for the third quarter of 2013 was $2.2 million or 21 percent of revenues, compared to $1.4 million or 15 percent of revenue for the same amount of 2012. This improvement is a complete result of the upsurge in recurring service revenue and margin improvements from existing accounts. Operating expenses for the third quarter of 2013 were $1.4 million, compared to $1.7 million in the same amount of 2012.National Institute of Arthritis and Musculoskeletal and Pores and skin Diseases . The disorder causes joint discomfort and stiffness. In some cases, hip or knee substitute may be an excellent option for patients with osteoarthritis to alleviate pain and stiffness and restore flexibility, NIAMS said. As many as 1.8 million hip or knee replacements worldwide are performed each year, background information from the scholarly study noted. Fonarow said that carrying out a heart-healthy lifestyle may be the best way to lessen the chance of a heart attack during and after an operation.