Knee Sprain Treatment
A knee sprain occurs when one or more of the ligaments that stabilize the knee joint is stretched or torn — and the severity can range from a mild stretch that heals with rest to a complete rupture that leaves the joint unstable and requires surgical reconstruction. The knee depends on four primary ligaments to control movement and prevent the bones from shifting out of alignment: the anterior cruciate ligament (ACL) and posterior cruciate ligament (PCL), which control front-to-back stability and rotation, and the medial collateral ligament (MCL) and lateral collateral ligament (LCL), which prevent side-to-side instability. Knee injuries involving a sprain are among the most common injuries in sports — particularly those involving sudden direction changes, pivoting, or direct contact — but they can also result from a misstep, a fall, or an awkward twist during everyday activity. Because the symptoms of a mild sprain and a complete ligament tear can overlap significantly in the early stages, prompt evaluation by a knee specialist is critical for determining which ligament is involved, how severely it is damaged, and whether the injury can heal on its own or requires intervention.
Dr. Jonathan Glashow is a board-certified orthopedic surgeon and Clinical Associate Professor of Orthopedic Surgery at NYU Grossman School of Medicine, with over 30 years of specialized experience diagnosing and treating knee ligament injuries — from grade 1 sprains that respond to structured rehabilitation to complex multi-ligament tears requiring advanced surgical reconstruction. His published research in the Journal of Bone and Joint Surgery on ACL and meniscal diagnosis helped establish the clinical standards for evaluating ligament injuries, and his pioneering work in all-inside ACL reconstruction and BEAR implant repair has expanded the surgical options available to patients with severe knee sprains. As Chief Medical Officer for the New Jersey Devils and Philadelphia 76ers, Dr. Glashow manages acute knee sprains in professional athletes under conditions that demand rapid, accurate diagnosis and optimal treatment decisions. Named a Castle Connolly Top Doctor every year since 2000, he evaluates knee sprains with same-day imaging at his Upper East Side practice in New York City.
Different Grades of Knee Sprains
A knee sprain involves stretching or tearing one or more ligaments of the knee joint. There are four main ligaments in the knee: anterior cruciate ligament (ACL), posterior cruciate ligament (PCL), medial collateral ligament (MCL) and lateral collateral ligament (LCL). When the knee twists or overextends, it can stretch or tear one or more ligaments that support and stabilize the knee joint. Three different grades of knee sprains can occur:
- Grade 1: One or more ligaments were stretched, causing small tears in the ligament for a mild knee sprain.
- Grade 2. Partial tears of a ligament can impact the stability of the knee joint, causing a moderate knee sprain.
- Grade 3. A complete tear of a ligament in the knee causes instability of the joint. It is the most severe form of knee sprain.
Grade 1 & 2 knee sprains can usually be treated with conservative methods. RICE (rest, ice, compression and elevation) is recommended to allow the ligament tears to heal. This should be followed by physical therapy or rehabilitation to regain strength in the knee joint. Grade 3 knee sprains may require surgical treatment, and it is common for more than one ligament to be torn in a single injury.
Dr. Glashow is a top sports medicine and orthopedic surgeon who offers the most advanced options in knee sprain treatments. Our medical facility offers cutting-edge treatments for anyone with a knee sprain, from professional athletes to people of all ages and walks of life. If you have a knee sprain, contact us to schedule a prompt appointment for an evaluation and treatment plan at our clinic in New York City.
Frequently Asked Questions About Knee Sprains
How do I know if my knee sprain is serious?
Signs that a knee sprain may involve significant ligament damage include hearing or feeling a pop at the time of injury, rapid swelling within the first several hours, a feeling that the knee is giving way or cannot support your weight, visible bruising, and significant pain when attempting to bend or straighten the leg. A grade 1 sprain typically produces mild tenderness and minimal swelling, while grade 2 and grade 3 sprains cause progressively more swelling, instability, and loss of function. Dr. Glashow recommends evaluation for any knee sprain involving a pop, rapid swelling, or a sensation of instability — even if the pain seems manageable — because some complete ligament tears are less painful than partial tears in the acute phase.
Which ligament is most commonly sprained in the knee?
The MCL is the most frequently sprained knee ligament, typically injured by a force applied to the outside of the knee that pushes the joint inward — such as a tackle in football or a collision in basketball or soccer. The ACL is the second most commonly sprained ligament and usually tears during a non-contact pivoting, cutting, or landing mechanism. PCL and LCL sprains are less common but can occur from dashboard injuries, hyperextension, or direct blows to the inner side of the knee. Dr. Glashow determines which ligament is involved — and whether multiple ligaments are affected — through clinical examination and MRI.
Do all knee sprains require an MRI?
Not all knee sprains require an MRI, but imaging is recommended for any sprain involving significant swelling, instability, an inability to bear weight, or a clinical examination that suggests a grade 2 or grade 3 ligament tear. An MRI provides detailed visualization of the ligaments, menisci, and cartilage that X-rays cannot show, and it is essential for surgical planning when reconstruction is being considered. Same-day MRI is available at Dr. Glashow’s Upper East Side practice.
Can a knee sprain heal without surgery?
Many knee sprains — including most grade 1 and grade 2 injuries and even some complete MCL tears — can heal successfully with conservative treatment including rest, ice, compression, elevation, bracing, and a structured physical therapy program. The MCL in particular has a strong blood supply and reliable healing capacity. However, complete ACL tears rarely heal to a functional level without surgical reconstruction in patients who want to return to pivoting sports, and multi-ligament injuries often require surgical intervention to restore adequate joint stability. Dr. Glashow evaluates each patient individually and takes a conservative-first approach whenever the injury pattern supports it.
How long does it take to recover from a knee sprain?
Recovery timelines depend on the grade of the sprain and which ligament is involved. Grade 1 sprains typically heal within one to three weeks with rest and rehabilitation. Grade 2 sprains generally require four to eight weeks before returning to full activity. Grade 3 sprains — particularly those requiring surgery such as ACL reconstruction — may take six to twelve months for complete recovery and a return to competition. Dr. Glashow provides each patient with a specific recovery timeline and coordinates rehabilitation closely with physical therapists to ensure safe, progressive return to activity.
Can a knee sprain lead to long-term problems?
If properly diagnosed and treated, most knee sprains heal well without lasting complications. However, untreated or inadequately rehabilitated ligament injuries can lead to chronic knee instability — where the joint gives way during activity — which significantly increases the risk of secondary injuries including meniscus tears, cartilage damage, and early-onset arthritis. This is why accurate initial evaluation and a complete rehabilitation program are so important, even for sprains that seem relatively mild at first.
