i agree with physio dace. Lets r/v the orginal question, is SLR is anyway harmful in an 1-2 week post acl injury period. My understanding is that, check the SLR to identify the extensor mechanism, if there is an extensor lag- never do an SLR with an extensor lag, with compromised acl patients. Cos, tat puts too much stress on the acl, and may be potential harms. Going back to intial period, reduce swelling and get the range of flexion back upto 90degrees. I dont think any orthopaedic surgeon, would be operate an ACL, wth restricted knee ROM. Hence lets not glorify or underglorify SLR, treat as it goes. Any thoughts????????????