Yes — on a manual-focus prime, a likely cause is damage to the focusing helicoid (the threaded mechanism that moves the optical unit for focusing). A hard knock can cause those threads to bind or become cross-threaded, which can make the focus ring stop turning.

That matches the reported fix for this exact lens type: the internal threaded focusing unit had slipped and jammed, and the lens had to be disassembled, repaired, reassembled, checked, and adjusted repeatedly to restore correct focus scale alignment.

This is a mechanically involved repair even on a simple prime lens, and much more complex on autofocus or zoom lenses. If the ring is completely stuck after a drop, forcing it is a bad idea because it can worsen thread damage. A careful teardown and realignment/repair is the usual remedy.