Assertion: grade spondylolisthesis | /r/HasProperty | greater than 75% slippage
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text: Research has shown that patients with a spondylolisthesis of greater than a 50% slippage, termed a grade 3 spondylolisthesis (50 to 75% slippage), or a grade 4 spondylolisthesis (greater than 75% slippage), generally do not respond to non-surgical treatment and are likely candidates for surgery.