Knobby Knees now part of National Trails System Posted in: News The Vindicator | Casey Stinnett — The small protrusion at lower left is a knobby knee. Watch out for them when exploring the refuge. The Vindicator | Casey Stinnett — Shown here is the Palmer Bayou Boardwalk. The Vindicator | Casey Stinnett — Sunset from the Knobby Knees Trail. The Knobby Knees Trail has been added to the National Trails System, according to an announcement today from U.S. Secretary ...PLEASE LOG IN FOR PREMIUM CONTENT. Our website requires visitors to log in to view the best local news. Not yet a subscriber? Subscribe today!