Spot the diagnosis 539-540

(539) A patient walks with high stepping gait and is unable to dorsiflex the ankle and evert the foot . Spot the diagnosis?

(540) A patient of compound fracture has come . On palpation around the wound there are crepitations . Spot the diagnosis?

Answers.
(539) Paralysis of lateral popliteal nerve .
(540) Gas gangrene .