There are always ostensible reasons, eg keel patents, but the literal reason is preservation of market share.
It's not just Spinal Kinetics of course. Synthes sued Medtronic (maverick disc) for infringement, lost profits and royalties. Synthes filed suit against Diverse Surgical Supplies Inc. Synthes has sued MedFix Solutions. Synthes filed claim against Stryker Corporation and others. They've sued various companies for reasons ranging from patent infringement to claims of unfair competition and violation of the Lahnam Act.
Synthes even filed a claim against a co. called GM Dos Reis, a Brazilian manufacturer, for simply displaying a disc that had a similar locking "bone plate" at a spinal surgery conference in NY; a claim that was dismissed. It's pretty endless.
Imagine if all that time, effort and legal fees in suing each other was used toward the research & development of spine medicine. Freely sharing ideas instead of suing for infringing on ideas.



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uncovertebral joint hypertrophy, moderate central canal stenosis- Severe neuroforaminal stenosis bilaterally, right greater than left
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