Gregory S DiFelice, MD

Gregory S DiFelice, MD Dr. Gregory S.

DiFelice, an Orthopaedic Surgeon specializing in Sports Traumatology and Joint Reconstruction Surgery.

**The views expressed in my posts are my own & don’t represent HSS.**

What a great story. This patient turned 70 in December and decided it was time to get back into ski racing.More than 20 ...
04/27/2026

What a great story. This patient turned 70 in December and decided it was time to get back into ski racing.

More than 20 years after an ACL injury that led to post-traumatic osteoarthritis, he underwent a total knee replacement.

He entered a race at Mountain Creek.
Took second place in his division.
Went home with a medal.

Grateful to have been a small part of this one.

Can you guess which leg had surgery?Seven months out.15 year old goalkeeper.ACL Primary Repair with augmentation.Passed ...
04/23/2026

Can you guess which leg had surgery?

Seven months out.
15 year old goalkeeper.
ACL Primary Repair with augmentation.

Passed every return to sport test.
Symmetric quad strength.
No hesitation. No compensation.

Hard to tell at first glance.
That’s the goal.

Restore the knee so well that you can’t pick a side.

04/21/2026

When I started repairing the ACL, the question was always the same: “Where’s the 2-year data?”

We got the 2-year data.
Then it became: “Where’s the 5-year data?”

We got the 5-year data.
Then it was: “But what about long-term?”

Now we have it.

10-year outcomes after arthroscopic ACL primary repair.

And here’s what matters:
Low rates of clinically significant osteoarthritis.
Stable knees.
High patient-reported outcomes.
And a durable repair in appropriately selected patients.

This isn’t about saying repair is for everyone.
It’s not.

It’s about proving that in the right patient, with the right tissue,
preservation holds up over time.

The conversation is changing. Because now… the long-term data is here. Link to publication in bio.

Right where he’s happiest.Palisades Tahoe. Real terrain. Real skiing. No hesitation.Five years status post ACL primary r...
04/16/2026

Right where he’s happiest.

Palisades Tahoe. Real terrain. Real skiing. No hesitation.

Five years status post ACL primary repair.
: 1 mm side to side difference.
Function: he doesn’t even think about his knee.

This is the goal. Not just stability in the clinic…
but confidence that holds up over time.

When it’s indicated, repair delivers.

Preservation First doesn’t stop at the ACL.High-level highschool wrestler. Felt a pop.MRI showed ACL and LCL tears. Many...
04/14/2026

Preservation First doesn’t stop at the ACL.

High-level highschool wrestler. Felt a pop.
MRI showed ACL and LCL tears. Many would reconstruct both.

But inside the knee, the tissue told a different story.

The anteromedial bundle of the ACL was repairable → preserved with quad tendon augmentation.
LCL was repairable → repaired, supported with LET.

Not everything needed to be replaced.
Everything needed to be understood.

This is the shift:
Why reconstruct… when the body’s biology can hold?
RBAR™ is a treatment algorithm that matches treatment to tear type and tissue quality. Simple tear. Simple repair. Complex tear, but repairable. Complex repair with biologic augmentation, including BEAR when appropriate. One bundle repairable, one bundle destroyed. Preserve the good bundle and replace the non salvageable one. That is augmentation. Entire ligament destroyed. Reconstruction.

Multiligament injuries aren’t “reconstruct everything.”
They’re “treat each structure correctly.”

One year later → back to elite competition.
10th in the country.

Preservation First isn’t about avoiding reconstruction.
It’s about knowing when you don’t need it.

This MRI… most would say reconstruction.But would it?Take a closer look.On imaging, this looks like a classic ACL tear h...
04/10/2026

This MRI… most would say reconstruction.
But would it?

Take a closer look.

On imaging, this looks like a classic ACL tear headed for reconstruction.
That’s where most decisions stop.

But surgery doesn’t start with the graft.
It starts with a look inside the knee.

Before committing to reconstruction, the ligament was evaluated directly.
What we found was different than what the MRI suggested.

The posterolateral bundle wasn’t gone.
It was flipped forward.

And more importantly… it could be positioned back in place.
Restored.
Repaired.

So instead of replacing the ACL, we preserved it.

This is the difference between reading an MRI and understanding the tissue.

Most ACL decisions are made before the surgeon ever enters the OR.
By the time a patient is on the schedule, the path often feels set.

But timing matters.
Biology matters.
And what the tissue actually looks like… matters most.

Once you reconstruct, there’s no going back.

That doesn’t make reconstruction wrong.
It makes the decision leading up to it everything.

The hardest part of ACL surgery isn’t what happens in the OR.
It’s recognizing, early enough, when preservation is still possible.

Join us for an unforgettable night of live music  as Dr. D and the Repaired Men take the stage to raise funds for Operat...
04/09/2026

Join us for an unforgettable night of live music as Dr. D and the Repaired Men take the stage to raise funds for Operation Walk NYC! April 28th, starting at 7:00 PM.

Every ticket sold helps provide crucial joint replacement surgeries to patients in need in Guatemala during Operation Walk NYC’s inaugural mission this coming June. Please note this event will not sell tickets at the door. Please be sure to purchase tickets in advance. Link to buy tickets in bio.

Not all ACLs are repairable, so reconstruction is indicated. But not all ACL reconstructions are the same, and it is jus...
04/06/2026

Not all ACLs are repairable, so reconstruction is indicated. But not all ACL reconstructions are the same, and it is just as important to tailor each one to the patient.

This patient is now two years status post autograft quadriceps tendon reconstruction with lateral extra articular tenodesis and doing great.

Long term follow up matters. It is how we truly understand durability, function, and return to sport, and how we continue to refine what we do.

04/02/2026

Quadriceps atrophy can be an uphill battle after ACL reconstruction. Because ACL repair does not require a graft, patients can often regain quad function sooner and avoid some of that early shutdown. Here, just two hours after surgery and still in recovery, this patient is already able to perform an active straight leg raise.

Five cases. Five different stories. One shared theme.Each of these patients was told reconstruction was their only optio...
03/31/2026

Five cases. Five different stories. One shared theme.

Each of these patients was told reconstruction was their only option. Each of them underwent repair.

From MRI to intraoperative findings to final outcomes, the common thread was thoughtful decision making in the OR. A careful, real-time assessment of tissue quality guided the treatment, not a one-size-fits-all algorithm.

That step matters. It always has since I began repairing the ACL over 20 years ago.

One year after an ACL Primary Repair with BEAR augmentation, and lateral extra-particular tenodesis. Doing great.1 mm si...
03/26/2026

One year after an ACL Primary Repair with BEAR augmentation, and lateral extra-particular tenodesis. Doing great.

1 mm side to side difference on and back to softball and cheerleading this fall.

Strong. Stable. Back doing what she loves.

Celebrated the milestone the right way with a cake 🎂

Address

523 East 72nd Street, 2nd Fl
New York, NY
10021

Opening Hours

Monday 9am - 5pm
Tuesday 9am - 5pm
Wednesday 9am - 5pm
Thursday 9am - 5pm
Friday 9am - 5pm

Telephone

+12126061844

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