Ortho Dx: Extension lag deformities following stab wound to forearm

A man, aged 22 years, presents with a stab wound to the forearm that occurred during an altercation 5 days ago. The knife entered the dorsal and distal one-third forearm on the ulnar side. He is unable to extend his ring, middle, and index fingers and thumb since the injury. He can actively extend the small finger and ...