Patellofemoral Overload After ACL Surgery: When More Rehabilitation Is Not Better

Reviewed and Approved by Dr Ritwik Kejriwal (Orthopaedic Surgeon)

I recently treated an ACL reconstruction patient whose rehabilitation had stalled because of persistent pain behind the kneecap and recurrent swelling.

He had worked extremely hard on his rehabilitation and progressed strengthening aggressively, including significant loading of the knee in deeper flexion. His ACL was stable and progressing well, but increasing retropatellar pain and swelling prevented him from building strength and moving forward.

Despite modifying his rehabilitation, the symptoms persisted.

At nine months, arthroscopy identified an unstable patellar chondral lesion, which was treated with chondral debridement. Since then, his pain and swelling have improved significantly and his ACL rehabilitation has taken off again.

The case reinforced an important principle for me:

More rehabilitation is not always better rehabilitation

Progressive loading is essential after ACL surgery. Squats, lunges, leg press and deeper knee flexion all have an important role.

But it is not just how much you load the knee — it is how you load it and how the knee responds.

Loaded deeper flexion places increasing demands on the patellofemoral joint. If load, depth or volume progresses faster than the knee can tolerate, patients can develop retropatellar pain and swelling.

Importantly, this can occur even when there is no underlying patellofemoral cartilage pathology.

In some patients with significant symptoms, I have obtained an MRI which has demonstrated patellofemoral bone stress reaction, providing objective evidence that the joint has been overloaded.

In others, as in the patient above, excessive loading may aggravate underlying chondral pathology and make it persistently symptomatic.

Load → Response → Adjust

LOAD
Progress strength and function.

RESPONSE
What happens later that day and the following morning?

ADJUST
Increasing retropatellar pain, swelling or stiffness? Reconsider the exercise, load, depth and volume.

And importantly:

REASSESS
If symptoms persist despite appropriate modification, reconsider the diagnosis rather than simply pushing harder.

Most anterior knee pain after ACL surgery does not require further intervention. But persistent pain and recurrent swelling may warrant reassessment and, occasionally, further imaging.

For my patient, identifying and treating the unstable chondral lesion was the turning point.

Take-home message

Progressive loading is fundamental after ACL surgery — but the knee needs time to develop the capacity to tolerate that load.

Load the knee.
Watch its response.
Adjust when necessary.
Reassess when progress stalls.

Don't just rehabilitate the protocol. Rehabilitate the knee in front of you.