MOVEMENT FOCUSED

PREVENTION FORWARD

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




Redefining Orthopedic Care


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

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
Conditions We Treat — Non-Surgical Sports Medicine NYC | Defiance Sports Medicine

Conditions Treated

From head to foot,
we've got you.

Tap on a body part to see what we treat.

Shoulder

  • Rotator Cuff Tears & Impingement
  • Rotator Cuff Tendinopathy
  • Shoulder Osteoarthritis
  • Shoulder Bursitis
  • Frozen Shoulder (Adhesive Capsulitis)
  • AC Joint Injury
  • Shoulder Instability
  • Biceps Tendinopathy
  • Thoracic Outlet Syndrome

Knee & Leg

  • Patellofemoral Pain (Runner's Knee)
  • IT Band Syndrome
  • Patellar Tendinopathy
  • Quadriceps Tendinopathy
  • Meniscal Injuries
  • Knee Ligament Sprains (MCL/LCL)
  • Knee Osteoarthritis
  • Baker's Cyst
  • Osgood-Schlatter Disease
  • Shin Splints (MTSS)
  • Calf Strain
  • Stress Fractures (Femur, Tibia)

Spine & Back

  • Herniated Discs
  • Sciatica
  • SI Joint Dysfunction
  • Chronic Low Back Pain
  • Myofascial Pain / Trigger Points
  • Cervical Radiculopathy
  • Thoracic Pain

Hip & Groin

  • Hip Flexor Strain
  • Hip Bursitis (Trochanteric)
  • Hip Labral Tear
  • Hip Osteoarthritis
  • Athletic Pubalgia
  • Gluteal Tendinopathy
  • Hamstring Injury
  • Osteitis Pubis
  • Snapping Hip Syndrome
  • Femoroacetabular Impingement (FAI)

Elbow

  • Tennis Elbow (Lateral Epicondylitis)
  • Golfer's Elbow (Medial Epicondylitis)
  • Elbow Osteoarthritis
  • Posterior Interosseous Neuritis
  • Radial Neuritis
  • Ulnar Neuritis
  • Triceps Tendinopathy
  • UCL Partial Tears
  • Elbow Bursitis

Hand & Wrist

  • Carpal Tunnel Syndrome
  • De Quervain's Tenosynovitis
  • Wrist Osteoarthritis
  • TFCC (Cartilage Injury)
  • Wrist Sprains
  • Trigger Finger
  • Ganglion Cysts

Foot & Ankle

  • Ankle Sprains
  • Achilles Tendinopathy
  • Plantar Fasciitis
  • Ankle Osteoarthritis
  • Haglund Deformity
  • Calcaneal Spur
  • Peroneal Tendon Injuries
  • Peroneal Nerve Entrapment
  • Posterior Tibialis Tendinopathy
  • Sever's Disease
  • Metatarsal Stress Fractures
  • Morton's Neuroma

Head & Neck

  • Concussion
  • Cervicogenic Headaches
  • Neck Pain & Stiffness
  • Whiplash
  • Nerve Impingement (Cervical)
  • Postural Neck Pain
  • Peripheral Neuropathy
Full-body photo showing interactive musculoskeletal regions treated at Defiance Sports Medicine

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

#1Most common region we treat
80%of rotator cuff tears resolve without surgery
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14moAverage time patients waited before finding us
PRPOur most requested treatment for knee conditions
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Same dayDiagnosis via in-office ultrasound
Non-surgicalEvery spine treatment we offer avoids the OR
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Often missedHip labral tears are underdiagnosed in women
UltrasoundIn-office imaging for same-visit diagnosis
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PRP + ShockwaveCombined approach for stubborn tennis elbow
UltrasoundDynamic imaging to visualize tendon and nerve in motion
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No surgeryUltrasound-guided hydrodissection for carpal tunnel
In-officeSame-day diagnosis and treatment with ultrasound
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ShockwaveGold standard for chronic plantar fasciitis
Image-guidedEvery injection under ultrasound for precision
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StructuredRecovery protocols, not just "take it easy"
Return-to-sportGraded protocols to get you back safely
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All Conditions Treated at Defiance Sports Medicine — Non-Surgical Sports Medicine NYC

Shoulder Conditions

Rotator cuff tears and impingement, rotator cuff tendinopathy, shoulder osteoarthritis, shoulder bursitis, frozen shoulder (adhesive capsulitis), AC joint injury, shoulder instability, biceps tendinopathy, thoracic outlet syndrome.

Knee and Leg Conditions

Patellofemoral pain (runner's knee), IT band syndrome, patellar tendinopathy, quadriceps tendinopathy, meniscal injuries, knee ligament sprains (MCL/LCL), knee osteoarthritis, Baker's cyst, Osgood-Schlatter disease, shin splints (MTSS), calf strain, stress fractures of the femur and tibia.

Spine and Back Conditions

Herniated discs, sciatica, SI joint dysfunction, chronic low back pain, myofascial pain and trigger points, cervical radiculopathy, thoracic pain.

Hip and Groin Conditions

Hip flexor strain, hip bursitis (trochanteric), hip labral tear, hip osteoarthritis, athletic pubalgia, gluteal tendinopathy, hamstring injury, osteitis pubis, snapping hip syndrome, femoroacetabular impingement (FAI).

Elbow Conditions

Tennis elbow (lateral epicondylitis), golfer's elbow (medial epicondylitis), elbow osteoarthritis, posterior interosseous neuritis, radial neuritis, ulnar neuritis, triceps tendinopathy, UCL partial tears, elbow bursitis.

Hand and Wrist Conditions

Carpal tunnel syndrome, De Quervain's tenosynovitis, wrist osteoarthritis, TFCC cartilage injury, wrist sprains, trigger finger, ganglion cysts.

Foot and Ankle Conditions

Ankle sprains, Achilles tendinopathy, plantar fasciitis, ankle osteoarthritis, Haglund deformity, calcaneal spur, peroneal tendon injuries, peroneal nerve entrapment, posterior tibialis tendinopathy, Sever's disease, metatarsal stress fractures, Morton's neuroma.

Head and Neck Conditions

Concussion evaluation and return-to-sport management, cervicogenic headaches, neck pain and stiffness, whiplash, cervical nerve impingement, postural neck pain, peripheral neuropathy.

Patient Voices

What care
actually feels like.

Real stories from real patients. No scripts, no filters — just honest experiences.

★★★★★

I'd been told I needed knee surgery for two years. After PRP and a proper ultrasound diagnosis, I ran my first half-marathon this spring.

M.K. Runner, 41
★★★★★

Every doctor I'd seen spent 8 minutes with me. Dr. Liu spent an hour. She found what three MRIs missed — with a handheld probe in the office.

J.T. Desk worker, 38
★★★★★

I finally understand what's happening in my body. Dr. Liu explained everything on the ultrasound screen in real time. No other doctor has ever done that.

A.S. Yoga instructor, 34
★★★★★

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

J.M. Marathon runner, 29
★★★★★

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

R.T. CrossFit athlete, 36
★★★★★

Dr. Liu spent more time with me in one appointment than my previous doctor had in three years. I felt heard for the first time.

L.P. Teacher, 52