The goal of this clinical trial is to find out whether adding a bone-marrow aspirate concentrate (BMAC) injection during surgery can improve recovery in adults undergoing lumbar microdiscectomy for a lumbar disc herniation. The main questions it aims to answer are: * Does the BMAC injection lead to better disc tissue health after surgery (as seen on MRI scans)? * Does the BMAC injection lead to greater improvement in pain and disability compared to surgery alone? Participants will be adults aged 18 and older who are scheduled for lumbar microdiscectomy surgery. Researchers will compare one group of participants receiving the standard-of-care surgery plus the BMAC injection with another group receiving the same surgery without the injection to see if the injection offers added benefit. Participants will: * Have surgery (microdiscectomy) with or without the injection. * Complete pain and disability questionnaires at several times over 2 years. * Undergo MRI scans at baseline and follow-up to assess disc structure and tissue health. * Provide samples of leftover disc or bone-marrow tissue (as applicable) from surgery for analysis.
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Change from Baseline in Intervertebral Disc Hydration at 3 Months
Timeframe: Baseline and 3 Months post-operation
Change from Baseline in Intervertebral Disc Hydration at 1 Year
Timeframe: Baseline and 1 year post-operation
Change from Baseline in Intervertebral Disc Hydration at 2 Years
Timeframe: Baseline and 2 years post-operation
Change from Baseline in Proteoglycan Content at 3 Months
Timeframe: From enrollment to 3 Months post-operation
Change from Baseline in Proteoglycan Content at 1 Year
Timeframe: From enrollment to 1 year post-operation
Change from Baseline in Proteoglycan Content at 2 Years
Timeframe: From enrollment to 2 years post-operation
Change from Baseline in Disc Height Index at 3 Months
Timeframe: From enrollment to 3 months post-operation
Change from Baseline in Disc Height Index at 1 Year
Timeframe: From enrollment to 1 year post-operation
Change from Baseline in Disc Height Index at 2 Years
Timeframe: From enrollment to 2 years post-operation
Change from Baseline in Pfirrmann Grade at 3 Months
Timeframe: From enrollment to 3 months post-operation
Change from Baseline in Pfirrmann Grade at 1 Year
Timeframe: From enrollment to 1 year post-operation
Change from Baseline in Pfirrmann Grade at 2 Years
Timeframe: From enrollment to 2 years post-operation
Change from Baseline in Nucleus Pulposus Size at 3 Months
Timeframe: From enrollment to 3 months post-operation
Change from Baseline in Nucleus Pulposus Size at 1 Year
Timeframe: From enrollment to 1 year post-operation
Change from Baseline in Nucleus Pulposus Size at 2 Years
Timeframe: From enrollment to 2 years post-operation
Change from Baseline in NOCISCORE at 3 Months
Timeframe: From enrollment to 3 months post-operation
Change from Baseline in NOCISCORE at 1 Year
Timeframe: From enrollment to 1 year post-operation
Change from Baseline in NOCISCORE at 2 Years
Timeframe: From enrollment to 2 years post-operation