Scapholunate (SL) Ligament Tear Causes, Symptoms & Treatment
The scapholunate (SL) ligament connects the scaphoid and lunate bones in the wrist, helping stabilize wrist motion. A scapholunate ligament tear occurs when this ligament is overstretched or ruptured, often due to a fall on an outstretched hand or a forceful impact. Symptoms can include pain, swelling, bruising, weakness, and limited range of motion. Early diagnosis and treatment, whether non-operative or surgical, are crucial for optimal recovery.
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Find Relief TodayOverview
The wrist contains eight small bones called carpals, which connect the forearm to the hand. These bones are held together by ligaments—strong bands of fibrous tissue. The scapholunate (SL) ligament is one of the most important wrist ligaments, connecting the scaphoid bone (which spans both rows of carpal bones) and the lunate bone (the central bone in the proximal row).
When the wrist is forcefully extended or impacted, the SL ligament absorbs significant stress. If the force exceeds its capacity, a scapholunate ligament injury can occur, ranging from a mild sprain to a complete ligament tear in the wrist. Untreated injuries may lead to chronic instability or arthritis.
What causes Scapholunate (SL) Ligament Tear?
How the Injury Occurs:
A scapholunate ligament tear most often happens when an individual falls onto an outstretched hand. This impact causes the scaphoid to flex forward and the lunate to bend backward, overstretching or tearing the ligament.
Common Everyday Causes:
- Falling while running or walking
- Sudden forceful twisting of the wrist
- Direct trauma to the wrist
Sports-Related Risks:
SL ligament injuries are particularly common in high-contact or high-impact sports where falls on outstretched hands are frequent:
- Football – tackles or falls
- Rugby – collisions and scrums
- Wrestling – falls and wrist twists
Symptoms
Athletes or individuals with a scapholunate ligament injury may notice:
- Pain on the thumb side of the wrist, especially with movement
- Tenderness to touch over the scapholunate area
- Weakness when gripping or holding objects
- Swelling or bruising around the wrist
- Popping or clicking sensations (more common with complete tears)
- Limited range of motion
These symptoms may resemble a simple wrist sprain, so accurate diagnosis is essential.
When to see a doctor
If you experience symptoms of a ligament tear in the wrist, consult a doctor promptly. Early assessment improves outcomes. Your doctor may:
- Ask about your injury history and sports participation
- Conduct a physical exam for swelling, bruising, tenderness, and wrist mobility
- Order x-rays to check for fractures
- Recommend MRI or other imaging to assess ligament and soft tissue damage
Non-operative treatment
Partial scapholunate ligament tears often heal without surgery. Typical conservative care includes:
- Wrist immobilization using a splint or cast for several weeks
- Pain relief with NSAIDs like ibuprofen or naproxen
- Occupational therapy after immobilization to restore strength and motion
Exercises to Support Recovery:
Following healing, guided exercises can improve wrist flexibility, strength, and coordination. (Your PDF exercise program can be linked here.)
Surgical Treatment
Surgery may be necessary for:
- Complete scapholunate ligament tears
- Partial tears that are unresponsive to non-operative care
Always discuss the risks and benefits of surgery with your doctor to determine the best course of action.
Recovery
Recovery depends on the severity of the injury and whether it is treated non-surgically or with surgery. Some wrist injuries heal with rest, immobilization, and protection, while more severe injuries may require surgical treatment for proper healing. In general, recovery may include:
- Wearing a cast or splint for several weeks to protect and stabilize the wrist
- Avoiding activities that place stress on the wrist during the healing period
- Beginning physical or occupational therapy after the cast or splint is removed to restore motion and strength
- Returning to sports in approximately 6 weeks to 3 months or longer, depending on the extent of the injury and the demands of the sport
- Gradually resuming athletic activity, sometimes with the use of a wrist brace or support to help reduce the risk of re-injury
Dr. Jay Kimmel is a board-certified orthopedic surgeon specializing in sports medicine, arthroscopic surgery, and shoulder and knee disorders. He completed his orthopedic training at New York-Presbyterian/Columbia University Medical Center and a Sports Medicine Fellowship at Temple University.
Dr. Kimmel previously served as the Director of the Connecticut Sports Medicine Institute at Saint Francis Hospital and has held faculty appointments as Clinical Assistant Professor in the Departments of Orthopedics and Family Medicine at the University of Connecticut. He has extensive experience caring for athletes as a team physician for high school and collegiate programs and continues to teach in the athletic training departments at Westfield State University and Springfield College.
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/MonthFrequently Asked Questions
How do I know if I have a scaphoid sprain or a scapholunate ligament tear?
While symptoms overlap, imaging like X-rays or MRI helps distinguish between a simple sprain and a true ligament tear in the wrist.
How long does recovery take after an SL ligament injury?
Recovery varies by severity. Mild injuries may heal in 6–8 weeks, while severe tears requiring surgery can take 3–6 months for full wrist function.
Can I prevent a scapholunate ligament injury?
While not all injuries are preventable, wrist-strengthening exercises, protective gear, and proper fall techniques in sports can reduce risk.
Is surgery always required for a scapholunate ligament tear?
No. Partial tears often respond to non-operative treatment. Surgery is typically reserved for complete tears or cases that do not improve with conservative care.