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Nolan Horner, MD

02 — Expertise

Knee

Treatment of knee injury and knee pain with attention to the mechanics of how each patient loads, cuts, pivots and lands.

Black and white photograph of a runner's knee in motion

Credentials and training

  • Board certified

    Orthopedic surgery

  • Fellowship trained

    Sports medicine & shoulder, Rush University Medical Center

  • Residency

    Orthopedic surgery, McMaster University

  • Professional teams

    Chicago Bulls, White Sox and Fire experience

  • Research

    Over 100 peer-reviewed publications

More about Dr. HornerResearch and academic workPatient reviews

Approach to care

Knee injuries range from a single traumatic event to gradual wear that only becomes limiting over time. Diagnosis focuses on identifying which structures are involved and how they interact, since a ligament, a meniscus and a cartilage surface each recover on their own timeline.

Where non-operative treatment is likely to restore function, it is pursued deliberately and reassessed. When surgery is the better option, arthroscopic and minimally invasive approaches are used where appropriate.

For athletes, the goal is defined in terms of return to sport, and rehabilitation milestones are set accordingly.

Areas of focus

  • ACL and ligament injury
  • Meniscus tears
  • Cartilage injury
  • Patellar instability
  • Knee arthroscopy
  • Knee arthritis

How a knee problem is evaluated

Most knee complaints can be narrowed considerably before any imaging is ordered. The history matters: whether the injury happened in a single moment or built up over months, whether the knee swelled within hours or the next day, whether it catches, gives way, or simply aches after activity. Each of those patterns points toward different structures.

Examination then tests the knee directly — ligament stability, joint line tenderness, patellar tracking, alignment and the way the hip and ankle contribute to how the knee loads. Radiographs are usually the first imaging step, and MRI is added when the result would actually change the plan rather than as a reflex.

Non-operative treatment comes first when it can work

A large share of knee problems improve without surgery. Structured physical therapy that addresses quadriceps strength, hip control and movement mechanics is the foundation. Activity modification, bracing, and injections have defined roles depending on the diagnosis.

Degenerative meniscus tears in a knee with arthritic change, patellofemoral pain, early arthritis and many tendon problems typically respond better to rehabilitation than to arthroscopy. Where injections are considered, options and their limits are discussed openly — including cortisone, viscosupplementation for knee arthritis, and platelet-rich plasma.

When surgery is the better option

Surgery is recommended when the structural problem will not resolve on its own and it is limiting the knee in a way that matters to the patient. A complete ACL tear in someone who cuts and pivots, a displaced meniscus tear that locks the knee, recurrent patellar dislocation and symptomatic cartilage defects are the common examples.

Most of this work is done arthroscopically through small incisions. Before scheduling, the conversation covers what is being repaired versus removed, what the recovery actually looks like week by week, what could go differently, and what the alternatives are if surgery is declined or delayed.

Recovery and return to sport

Rehabilitation is planned alongside the procedure, not after it. Written protocols are shared with the patient and their therapist so everyone is working from the same timeline, and they are available on the patient resources page.

Return to sport is decided on objective criteria — restored motion, strength symmetry compared with the other leg, control on single-leg and landing tasks, and confidence in the knee — rather than the calendar alone. For athletes, milestones are tied to the demands of their position and coordinated with their trainer or coach.

Related care

Office visits in Oak Brook (Mondays), St. Charles (Thursdays) and Little Village (Wednesdays), 8:00 AM–4:00 PM.

Common questions

Do I need surgery for a meniscus tear?

Often not. Degenerative tears in a knee with arthritic change usually do better with therapy and activity modification. Surgery is more clearly indicated when a tear is displaced and locking the knee, or when a repairable tear occurs in a younger, active patient.

How soon after an ACL tear should surgery happen?

Rarely the same week. Motion and swelling are usually restored first with prehabilitation, which is associated with a smoother recovery. Timing is then set around your sport, school or work schedule.

Will I need an MRI before my visit?

No. Bring any imaging you already have, but come in without it if you do not — the examination and radiographs guide whether an MRI is worth ordering.

Where can I be seen for a knee problem?

Oak Brook on Mondays, Little Village on Wednesdays and St. Charles on Thursdays, 8:00 AM to 4:00 PM, with online booking for each office.

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