ACL Surgeon in the Lehigh Valley

Dr. Michael D. Hendel, MD, PhD evaluates ACL tears and performs ACL reconstruction for athletes and active patients in Bethlehem and the Lehigh Valley. Not every ACL tear requires surgery; the decision depends on instability, associated injuries, sport, and goals, and both pathways rely on structured, milestone-based rehabilitation.

Michael D. Hendel, MD, PhD

Residency & Fellowship Trained at Hospital for Special Surgery — ranked No. 1 in orthopedics by U.S. News & World Report (2026–2027) · Board Certified (ABOS)

ACL reconstruction and, in selected tears, ACL repair — residency and fellowship trained at Hospital for Special Surgery.

Dr. Michael D. Hendel, MD, PhD, orthopedic surgeon
Residency & Fellowship Trained at Hospital for Special Surgery · Board Certified (ABOS) · Subspecialty Certified in Orthopaedic Sports Medicine · Team Physician, Reading Royals & Lehigh Valley IronPigs

ACL Reconstruction in Bethlehem & the Lehigh Valley

A torn ACL is one of the most consequential knee injuries an athlete can sustain, and its treatment pathways are well established. Dr. Michael Hendel, MD, PhD performs arthroscopic ACL reconstruction for athletes and active adults across Bethlehem, Allentown, Easton, and the greater Lehigh Valley, using the techniques he trained in during his residency and sports medicine fellowship at Hospital for Special Surgery.

Dr. Hendel’s ACL expertise runs deeper than the operating room: he co-authored two chapters in the international ISAKOS ACL Surgery textbook — on ACL injury prevention and on treating ACL tears in the multi-ligament injured knee — and he evaluates ACL injuries every season as football team physician for Liberty and Freedom High Schools (PIAA District XI).

Graft Options

  • Bone-patellar tendon-bone (BTB) autograft — a long-established choice for competitive and contact athletes
  • Hamstring tendon autograft — less anterior knee pain, well suited to many recreational athletes
  • Quadriceps tendon autograft — excellent strength profile, increasingly popular
  • Primary ACL repair with internal brace — ligament preservation for select acute, proximal tears (see below)
  • Revision ACL reconstruction — for failed prior surgery, including complex staged cases

ACL Repair and Ligament Preservation

For carefully selected acute tears in which the ligament pulls off the femur with healthy tissue (proximal avulsion patterns), Dr. Hendel offers arthroscopic primary ACL repair with internal brace augmentation — reattaching and preserving your own ACL rather than replacing it with a graft. This ligament-preservation approach was pioneered at Hospital for Special Surgery by Dr. Gregory DiFelice during the years Dr. Hendel trained there.

When the tear pattern qualifies, repair means no graft harvest, preservation of the ligament’s natural nerve endings that contribute to knee position sense, and often a gentler early recovery. When it does not qualify — which MRI review determines — reconstruction remains the standard treatment, and Dr. Hendel will explain which option fits your knee. Primary repair is appropriate only for specific tear patterns; long-term data are more limited than for reconstruction, and re-tear rates may be higher in younger, high-demand athletes.

About half of ACL tears come with meniscus tears or cartilage damage. Dr. Hendel addresses these in the same surgery whenever possible — repairing rather than removing the meniscus when the tear pattern allows, which protects the knee for decades to come.

Milestone-based return to sport. Every ACL patient leaves with a written, phase-by-phase rehabilitation protocol — motion and quad activation first, running at months 3–4, agility at months 5–6, and functional testing to greater than 90% limb symmetry before clearance at 6–9 months, which may be longer depending on the individual and the surgeon’s assessment. For younger athletes returning to pivoting sports, many surgeons favor waiting at least 9 months.
This information is educational and does not replace an individual evaluation. Treatment recommendations and recovery vary from patient to patient.
Patient Information

Frequently Asked Questions

Most athletes walk without crutches within 1-4 weeks, jog at 3-4 months, begin sport-specific training at 5-6 months, and return to competition between 6 and 9 months, once strength and hop testing show greater than 90% symmetry with the healthy leg; this may be longer depending on the individual and the surgeon’s assessment. Timelines vary with graft choice and sport demands. See the full ACL surgery recovery timeline for a month-by-month breakdown.

Not always. Lower-demand patients willing to avoid pivoting sports can do well with rehabilitation and bracing. Surgery is usually recommended for athletes returning to cutting or contact sports, for knees that give way during daily life, and for combined injuries involving the meniscus. Dr. Hendel reviews your MRI with you and lays out both paths honestly.

No single graft is ideal for every patient. BTB autograft remains the benchmark for competitive athletes; hamstring and quadriceps grafts are excellent for many others. Dr. Hendel matches graft selection to your age, sport, anatomy, and goals, and explains the trade-offs of each.

Patient Experience

What Patients Can Expect

Clear Communication

Your imaging reviewed with you, every option explained, and time for all of your questions.

Honest Recommendations

Surgery is recommended only when it is the right answer — most conditions start with conservative care.

A Defined Recovery Plan

Every surgical patient leaves with a written, milestone-based rehabilitation protocol.

Contact

Schedule an ACL Consultation

Same-day appointments are often available when Dr. Hendel is in the office. Office in Bethlehem; surgery at St. Luke's Orthopedic Hospital — West End Campus, Allentown.

Schedule Online at St. Luke’s →
Bethlehem Office
St. Luke’s Orthopedic Care — St. Luke’s North Medical Center
153 Brodhead Road, Rear Entrance
Bethlehem, PA 18017
(484) 526-1735
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Hours: Mon, Tue, Thu, Fri 8:00 AM–4:00 PM · Wed 8:00 AM–3:00 PM
Surgical Location
St. Luke’s Orthopedic Hospital — West End Campus
521 Cetronia Road
Allentown, PA 18104
About the Hospital →  ·  Get Directions →
Dr. Hendel performs surgery at St. Luke’s dedicated orthopedic specialty hospital on the West End campus. Allentown-area patients: see orthopedic care serving Allentown.
St. Luke’s University Health Network

Request an Appointment

Same-day appointments are often available when Dr. Hendel is in the office. Call during office hours, or schedule online through St. Luke’s at any time.

Call (484) 526-1735 or Schedule Online at St. Luke’s

Established patients can also message the care team, request refills, and view results through St. Luke’s MyChart.

Book Appointment (484) 526-1735