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ACL Rehab: Physical Therapy in Brooklyn After an ACL Tear or Reconstruction

By Dr. Jack Engelberg, PT, DPT · · 4 min read

A pivot on the basketball court, an awkward landing in a soccer game, or a misstep while skiing, and then a pop and a swollen knee. That's how many anterior cruciate ligament (ACL) injuries begin. Whether you're a high school athlete in Midwood, a weekend league player on Staten Island, or someone who simply wants a knee you can trust, rehabilitation is the most important part of recovering from an ACL tear, with or without surgery.

What Is the ACL?

The ACL is one of the four main ligaments of the knee. It runs through the center of the joint, connecting the thighbone to the shinbone, and keeps the shinbone from sliding too far forward and rotating excessively. It's especially important during cutting, pivoting and landing.

How ACL Tears Happen

Most ACL tears are non-contact injuries: sudden stops, changes of direction, or landing from a jump with the knee collapsing inward. Contact injuries, such as a tackle to the side of the knee, also occur. ACL tears often happen along with injuries to the meniscus, cartilage or other ligaments.

Common Symptoms

  • A "pop" felt or heard at the moment of injury
  • Rapid swelling within hours
  • Pain and difficulty bearing weight
  • Loss of full knee motion
  • A feeling of instability or the knee "giving way," especially with turning

Surgery or No Surgery?

Not everyone with an ACL tear needs reconstruction. The decision depends on your age, activity goals, the stability of your knee, and other injuries. People who want to return to cutting and pivoting sports often choose surgery, while some less active people do well with rehab alone. Your orthopedic surgeon will help you decide. Either way, physical therapy is essential.

How Physical Therapy Helps

Before Surgery ("Prehab")

Going into surgery with less swelling, full knee extension and good quadriceps control is linked to a smoother recovery. Prehab focuses on:

  • Reducing swelling
  • Restoring full straightening and good bending
  • Activating and strengthening the quadriceps
  • Normalizing walking

After Surgery: The Phases of Rehab

ACL rehabilitation typically takes many months, and today's approach emphasizes meeting strength and movement criteria rather than just reaching a date on the calendar.

  1. Early phase (first weeks): Control swelling and pain, regain full knee extension, start quad activation, and walk normally, often weaning off crutches as allowed.
  2. Strength phase: Progressive strengthening of the quadriceps, hamstrings, hips and core; balance and single-leg control; low-impact cardio like cycling.
  3. Running and plyometric phase: When strength and control criteria are met, a gradual return to running, hopping and landing drills.
  4. Return-to-sport phase: Agility, cutting, sport-specific drills and testing (strength comparisons, hop tests and movement quality) to guide clearance with your surgeon.

Treatment May Include

  • Manual therapy and swelling management
  • Neuromuscular electrical stimulation for quadriceps activation when appropriate
  • Progressive resistance training
  • Balance, proprioception and landing mechanics training
  • Running progressions and agility drills
  • Return-to-sport testing
  • Injury prevention programs to lower the risk of re-injury

What You Can Do at Home

  • Follow your home exercise program consistently. Progress between sessions is built at home.
  • Prioritize full extension early on. Avoid propping a pillow under your knee for long periods.
  • Control swelling with elevation, compression and ice as directed.
  • Protect the graft by following your surgeon's restrictions on bracing and weight-bearing.
  • Be patient with return to sport. Feeling good is not the same as being ready. Testing helps reduce the risk of re-injury.

Preventing ACL Injuries

For athletes, especially young female athletes who have a higher risk, neuromuscular training programs that teach good landing and cutting mechanics and build strength have been shown to reduce ACL injury rates. Ask about prevention training for your team or child.

When to See a Physical Therapist

  • After any significant knee injury with swelling or instability, once evaluated by a physician
  • Before ACL surgery for prehab
  • After ACL reconstruction
  • If you've completed rehab but still don't trust your knee

See a physician promptly after a knee injury with a pop and swelling, inability to bear weight, a locked knee, or numbness or color changes in the foot.

Frequently Asked Questions

How long does it take to return to sports after ACL surgery?

It usually takes many months. Return to cutting and pivoting sports is commonly not considered until at least around nine months, and only when testing shows you are ready. Your surgeon makes the final call.

Can I walk with a torn ACL?

Many people can walk once swelling settles, but the knee may give way with turning. That instability can damage other structures, so get it evaluated.

Will I get arthritis after an ACL tear?

ACL injury increases the long-term risk of knee osteoarthritis. Staying strong and maintaining a healthy weight are good ways to protect your knee.

Ready to get started? Call the Refuah office nearest you

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About the author. Dr. Jack Engelberg, PT, DPT is a Doctor of Physical Therapy and owner of Refuah Physical & Occupational Therapy, with offices in Midwood and Boro Park, Brooklyn, and on Staten Island.

Medical disclaimer: This article is for general education only and is not medical advice, diagnosis or treatment. Everyone’s situation is different. Talk with your physician or a licensed physical therapist about your symptoms. If you think you have a medical emergency, call 911.

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