MOVEMENT FOCUSED

PREVENTION FORWARD

Evidence-based sports medicine for all individuals.
From injury to impact – without surgery. 

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Defiance Medical — Philosophy
ALTERNATIVES TO ORTHOPEDIC SURGERY SPORTS MEDICINE FUNCTIONAL MEDICINE REGENERATIVE CARE

Defiance brings together musculoskeletal care, rehabilitation, and biologics — precise, non-surgical solutions under one roof.

Evidence-Based Medicine
Personalized treatments
Ultrasound-Guided Procedures
Image-guided precision, every time
Hospitality Forward
Body-positive, empowering care
Why Defiance

Why Defiance

We're your doctor, your diagnostics, your movement specialist, your recovery partner, your longevity strategist. One team that treats what's happening now  — before it becomes something that requires a surgeon.

A physician who knows your history, answers your calls, and sees you the same or next day. Not a system—a person.

Meet Our Doctor

Dr. Sally Liu, MD

Sports Medicine • Physical Medicine & Rehabilitation

Dr. Sally Liu is a Physical Medicine & Rehabilitation and fellowship-trained Sports Medicine physician specializing in non-surgical orthopedic care. Using advanced musculoskeletal ultrasound, she combines image-guided treatments with individualized rehabilitation strategies to diagnose and treat the root causes of pain.

Her clinical approach integrates biomechanics, regenerative medicine, and wearable technology insights to support recovery, optimize movement, and promote long-term musculoskeletal health. Dr. Liu cares for individuals seeking to move without limitation and remain engaged in the activities that matter most — whether that is training for a competition, managing pain and arthritis, or navigating the physical demands of everyday life.

Her philosophy is simple: understand first, then treat. Every visit starts with listening, and every plan is built around you.

Dr. Sally Liu, MD — Sports Medicine and Physical Medicine & Rehabilitation physician at Defiance Sports Medicine in New York

Our Services

Specialized care,
precisely delivered.

All procedures are non-surgical, performed with real-time ultrasound guidance, and delivered with your goals in mind.

PRP Therapy

Your own blood, concentrated to platelets, and injected to accelerate healing in tendons, joints, and soft tissue.

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Shockwave Therapy

Non-invasive acoustic waves that stimulate repair in chronically injured tendons and fascia.

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Women's Sports Medicine

Individualized care for female athletes at every level — from injury prevention and ACL risk to hormonal health, nutrition, and performance.

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Nerve Hydrodissection

Ultrasound-guided fluid release of entrapped nerves, to alleviate numbness, tingling, and chronic nerve pain.

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Nerve Blocks

Targeted injections that interrupt pain signals at their source — serving both a diagnostic and therapeutic role.

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Diagnostic Ultrasound

Real-time, in-office imaging of muscles, tendons, nerves, and joints.

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Concussion Management

Evidence-based evaluation and structured return-to-sport protocols.

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Viscosupplementation

Hyaluronic acid injections that restore joint lubrication and reduce pain in arthritic knees and hips.

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All Services
Conditions We Treat | Defiance Sports Medicine NYC – Non-Surgical Sports Medicine

What We Treat

Conditions,
from head to foot.

Non-surgical musculoskeletal care for every part of the body. Select a region to explore what we evaluate and treat.

Select a body
region to explore
conditions we treat.

Defiance Medical — Services
Our Expertise

Alternatives to Orthopedic Surgery

Ultrasound-guided therapies, biologics, and rehabilitation designed for active adults seeking alternatives to orthopedic surgery.

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Sports Medicine Services in NYC | Defiance Medical Skip to main content

Specialized care,
precisely delivered

All procedures are non-surgical, performed with real-time ultrasound guidance, and delivered with your goals in mind.

PRP Therapy

Your own blood, concentrated to platelets, and injected to accelerate healing in tendons, joints, and soft tissue.

Shockwave Therapy

Non-invasive acoustic waves that stimulate repair in chronically injured tendons and fascia.

Women's Sports Medicine

Individualized care for female athletes at every level — from injury prevention and ACL risk to hormonal health, nutrition, and performance.

Nerve Hydrodissection

Ultrasound-guided fluid release of entrapped nerves, to alleviate numbness, tingling, and chronic nerve pain.

Nerve Blocks

Targeted injections that interrupt pain signals at their source — serving both a diagnostic and therapeutic role.

Diagnostic Ultrasound

Real-time, in-office imaging of muscles, tendons, nerves, and joints.

Concussion Management

Evidence-based evaluation and structured return-to-sport protocols.

Viscosupplementation

Hyaluronic acid injections that restore joint lubrication and reduce pain in arthritic knees and hips.

Conditions We Treat — Non-Surgical Sports Medicine NYC | Defiance Medical
Option A — Body Map (SEO Optimized)

What We Treat

The ache that won't quit.
The injury that lingers.

Tap a region to see what we treat. If your body is holding you back, we can help.

Shoulder

  • Rotator Cuff Tears
  • Frozen Shoulder
  • Labral Tears
  • Shoulder Impingement

Knee

  • Meniscus Tears
  • Runner's Knee
  • ACL / MCL Sprains
  • Knee Osteoarthritis
  • Patellar Tendinopathy

Spine & Back

  • Herniated Discs
  • Sciatica
  • SI Joint Dysfunction
  • Chronic Low Back Pain

Hip

  • Hip Labral Tears
  • Hip Bursitis
  • Hip Osteoarthritis

Elbow & Wrist

  • Tennis Elbow
  • Golfer's Elbow
  • Carpal Tunnel Syndrome
  • De Quervain's Tenosynovitis

Foot & Ankle

  • Plantar Fasciitis
  • Achilles Tendinopathy
  • Ankle Sprains

Head & Nerve

  • Post-Concussion Syndrome
  • Nerve Entrapment
  • Peripheral Neuropathy
Interactive body map for selecting treatment regions

Select a region on the body to see conditions we commonly treat.

#1 Most common region we treat
80% of rotator cuff tears resolve without surgery
14mo Average time patients waited before finding us
PRP Our most requested treatment for knee conditions
Same day Diagnosis via in-office ultrasound
Often missed Hip labral tears are underdiagnosed in women
No surgery Nerve hydrodissection can release carpal tunnel
Shockwave Gold standard for chronic plantar fasciitis
Structured Recovery protocols, not just "take it easy"

All Conditions Treated at Defiance Medical — Non-Surgical Sports Medicine NYC

Shoulder Conditions Treated Without Surgery

Defiance Medical provides non-surgical treatment for shoulder conditions including rotator cuff tears, frozen shoulder (adhesive capsulitis), labral tears, and shoulder impingement syndrome. Treatments include PRP therapy, diagnostic ultrasound, and shockwave therapy at our New York City practice. Over 80 percent of rotator cuff tears resolve without surgery with the right care.

Knee Pain Treatment NYC

We treat knee pain and injuries without surgery, including meniscus tears, runner's knee (patellofemoral pain syndrome), ACL and MCL sprains, knee osteoarthritis, and patellar tendinopathy. Our approach includes PRP injections, viscosupplementation, and ultrasound-guided procedures. PRP therapy is our most requested treatment for knee conditions.

Spine and Back Pain — Non-Surgical Treatment

Non-surgical spine care for herniated discs, sciatica, sacroiliac joint dysfunction, and chronic low back pain. Same-day diagnosis with in-office diagnostic musculoskeletal ultrasound. Treatment options include nerve blocks, PRP therapy, and regenerative medicine.

Hip Pain Treatment Without Surgery

Expert diagnosis and treatment of hip labral tears, hip bursitis (trochanteric bursitis), and hip osteoarthritis. Hip labral tears are frequently underdiagnosed in women — our in-office diagnostic ultrasound enables accurate same-visit assessment and treatment planning.

Elbow and Wrist Conditions — Non-Surgical Care

Non-surgical treatment for tennis elbow (lateral epicondylitis), golfer's elbow (medial epicondylitis), carpal tunnel syndrome, and De Quervain's tenosynovitis. Ultrasound-guided nerve hydrodissection offers a non-surgical alternative for carpal tunnel release in our NYC office.

Foot and Ankle Pain Treatment NYC

Expert treatment for plantar fasciitis, Achilles tendinopathy, and chronic ankle sprains using shockwave therapy, PRP injections, and regenerative medicine. Shockwave therapy is the gold standard for chronic plantar fasciitis that has not responded to conventional treatments.

Concussion Management and Nerve Conditions

Structured concussion recovery protocols for post-concussion syndrome — not just rest. Non-surgical treatment for nerve entrapment and peripheral neuropathy using ultrasound-guided nerve hydrodissection and targeted nerve blocks at Defiance Medical in New York City.

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We treat people, not just injuries.

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Defiance Medical is a non-surgical sports medicine practice in New York City. 

Designed to empower those who refuse to sit out life because of pain.

We’re here to help you move better, recover smarter, and stay ahead of what could sideline you.

Medicine that meets you where you are.

Longer appointments. Deeper conversations.

No rushing. No assembly line. Just the time and attention your goals deserve.

Whole-person care.

We don't separate your knee pain from your sleep quality or your running form from your nutrition. It's all connected.

Accessible when you need us.

Same-week appointments. One doctor who knows you.

Advanced diagnostics in-office.

Expert diagnostic ultrasound performed by your physician. See your body in real-time and understand exactly what's happening.

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Cervicogenic Headaches

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What our patients say...

I came in with a running injury and left with a complete plan for nutrition, sleep, and training smarter. This is the care I didn't know I needed.

John Doe

Codetic

Finally, a doctor who doesn't just tell me to 'rest.' We fixed the problem and I'm stronger than before.

John Doe

Codetic

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John Doe

Codetic

Conditions We Treat | Defiance Medical NYC – Non-Surgical Sports Medicine

Conditions We Treat

Non-surgical musculoskeletal care for every part of the body. Select a region to explore what we evaluate and treat.

Select a body
region to explore
conditions we treat.

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