The hamstring tendon you mentioned is actually the Achilles tendon, not that it is short and can't contracture (without injury) in just one month. As you said, your feet can't go up (it is estimated that your big toes can't go up). Based on the above factors, it is concluded that most cases of open fracture or soft tissue injury will have different degrees of common peroneal nerve injury, plus surgical fracture reduction, limb traction and debridement of surrounding soft tissue.

So in my opinion, you are caused by common peroneal nerve injury, not Achilles tendon contracture. However, it cannot be ruled out that muscle adhesion after soft tissue injury leads to achilles tendon adhesion and cannot move well.

Diagnosis: Make a systematic neurological examination of the affected limb, and then determine the muscle and soft tissue injury after excluding the nerve injury.

Treatment: nerve growth drugs should be used to treat posterior nerve injury, and nerve exploration and release can be done if necessary. Simple muscle contracture, physical therapy, artificial passive joint movement to prevent further aggravation (there is no such method for the time being, and it can only be done after the fracture is initially stabilized), combined with blood-activating drugs.

The above are personal opinions and are for reference only.