KING OF PRUSSIA, Pa., May 20, 2019 /PRNewswire/ — Camber Spine, a leading innovator in spine and medical technologies, today reported preliminary unaudited proprietary sales results (sales of products innovated and owned by the company) for the first quarter ending March 31, 2019. Results reflect proprietary sales growth of 22% over the first quarter of 2018.  The growth was …