Welcome to the Uphill Athlete forum.
Sorry to hear about your injury. Here is the text from the 24-week training plan page –
If you miss a workout do not try to make it up. Just move on. If you miss more than 2 in a week then repeat that week. Do not increase the intensity and hope to gain more benefits. There is no short cut to when it comes to aerobic adaptation.
Assuming you have fully recovered from your injury, I would recommend you start again with your base period and be conservative with your first week of training. If you are training for a specific climb on a set date then you will have to make some adjustments to coming weeks.
You might find this forum discussion helpful –