A 58 year old woman presents to the emergency department one day after her cat bit her index finger. Physical examination shows signs of flexor tenosynovitis. She is admitted to the hospital for IV antibiotics, hand elevation, and emergent hand surgery consultation to consider debridement of the finger. Which of the following would be least likely expected in a patient with flexor tenosynovitis?
1) erythema of the flexor surface of the involved digit
2) pain with passive extension
3) tenderness over the flexor tendon sheath
4) swelling of the finger