01/11/2026
A sacral BSI is an overload injury to the sacrum caused by repetitive impact and insufficient recovery. It’s most common in runners and mountain athletes and often presents as deep, hard-to-pinpoint unilateral low back, buttock, or pelvic pain that worsens with running, hopping, or prolonged loading.
Early recognition matters—progressive loading, smart rest, and the right rehab plan are key to getting back to the mountains safely.
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