The jerks may happen for two reasons The most common reason is not doing strengthening exercises and proper rehabilitation that usually can only be done after 3 months of surgery so you should try that The second reason which is very rare is that your ligament may not have healed properly so I would suggest to go for strengthening rehab with a nearby physiotherapist and also get another MRI done to see if everything is in order Mri needs to be done with a musculoskeletal radiologist specialist as reporting of post op Mri requires a radiologist who is trained in musculoskeletal radiology