Proximal Hamstring Injury
Proximal Hamstring Injury
What is a proximal hamstring injury?
A proximal hamstring injury is damage to these tendons near where they attach to the sit bone. These injuries fall along a spectrum:
Tendinopathy: Gradual wear, irritation, and degeneration of the tendon, usually from overuse rather than a single event.
Partial tear: Some—but not all—of the tendon fibers pull away from the bone.
Complete tear (avulsion): One or more of the three tendons pull completely off the bone. When the torn tendon springs back (retracts) away from the sit bone, it may need to be reattached surgically.
Doctors also describe injuries by how recent they are: acute (recent) or chronic (longstanding). Recent, less-retracted tears are generally easier to treat than old, retracted ones.
Most proximal hamstring injuries occur during a forceful stretch of the muscle while it is contracting—called an eccentric contraction. This typically happens when the hip is bent forward and the knee is straightening at the same time, such as during sprinting, water skiing, hurdling, or a sudden slip. Tendinopathy, by contrast, usually develops gradually from repetitive loading. These injuries occur in both competitive athletes and everyday active people, and are common in middle-aged adults.
Appointment Information
Consider prompt evaluation if you feel a sudden "pop" and pain at the bottom of the buttock (especially with bruising down the thigh), if sitting is painful over the sit bone, or if you have hamstring weakness or a feeling of instability. Because recent tears are easier to repair than old ones, early assessment of a suspected complete tear is important. Also seek care for buttock or thigh pain that does not improve with rest and activity changes.
What are the symptoms of a proximal hamstring injury?
Sudden, sharp pain at the bottom of the buttock or back of the thigh at the moment of injury (with tears), often described as a "pop"
Bruising down the back of the thigh, which may appear over the following days
Pain when sitting, especially on hard surfaces, right over the sit bone
Weakness bending the knee or pushing off, and a feeling that the leg is unstable
With tendinopathy, a more gradual, deep ache in the buttock or upper thigh that worsens with running, lunging, or prolonged sitting
Pain that sometimes radiates down toward the back of the knee; because the sciatic nerve lies nearby, some people notice nerve-type symptoms
How is a proximal hamstring injury diagnosed?
Diagnosis is based on combining your symptoms, a physical examination and imaging.
Physical exam: Your doctor will press over the sit bone to check for tenderness and will test the strength of your hamstrings, often with the knee bent at different angles. Specific strength tests performed with the knee slightly and more fully bent are quite accurate for detecting a proximal tear. Your doctor may also check for a gap that can sometimes be felt when a tendon has torn away, and will assess whether the nearby sciatic nerve is involved.
MRI: This is the main ("gold standard") imaging test. It shows tendinopathy, distinguishes partial from complete tears, measures how far a torn tendon has pulled back, and shows how many of the three tendons are involved—all of which guide treatment.
X-rays: These do not show the tendons directly but can reveal cases where a small piece of bone has been pulled off with the tendon, which is more common in adolescents whose bones are still growing.
Ultrasound: In experienced hands, ultrasound can also show tears and allows imaging while the leg moves.
How is a proximal hamstring injury treated?
Many proximal hamstring injuries—particularly tendinopathy, low-grade partial tears, and complete tears with little tendon retraction—are treated successfully without surgery. First-line options include:
Activity modification: Temporarily avoiding the activities and positions that overload the tendon, such as sprinting, deep lunging, and prolonged sitting on hard surfaces.
Physical therapy: A guided, progressive program that restores pain-free motion and gradually rebuilds strength, with an emphasis on eccentric (lengthening-under-load) hamstring exercises. This is the cornerstone of nonsurgical care.
Medications: Acetaminophen and short courses of anti-inflammatory medication can help control pain; current expert guidance notes these do not appear to harm tendon healing.
Injections and other therapies: Platelet-rich plasma (PRP)—an injection prepared from your own blood—along with shockwave therapy and dry needling are sometimes used, but the evidence for these is still limited and evolving, and expert guidance does not currently establish a clear benefit from injections in initial treatment.
Surgery is generally recommended for complete tears in which the tendons have pulled away from the bone, for certain partial tears, and for injuries that have not improved after a good trial (typically around 6 months) of nonsurgical care. Commonly cited reasons to consider surgery include:
A complete tear of all three tendons
A tear of two tendons that have pulled back (retracted) more than about 2 cm, especially in active patients
Partial tears or tendinopathy that remain painful despite nonsurgical treatment
The goal of surgery is to reattach the torn tendon to the sit bone, usually with small anchors placed in the bone. The repair is typically performed through an incision in or near the crease at the bottom of the buttock. For longstanding, badly retracted tears, the operation is more involved—the surgeon may need to free the tendon and the nearby sciatic nerve from scar tissue, and occasionally a graft is needed to bridge the gap.
An important point about timing: repairs done sooner after injury generally have better strength, higher satisfaction, and lower re-tear rates than repairs of old, chronic tears—so prompt evaluation of a suspected complete tear matters.
For appropriately selected complete tears, surgical repair tends to produce better strength, function, satisfaction, and return to activity than nonsurgical treatment. In studies, most patients return to sport and are satisfied with the result, though some report residual pain, weakness, or a lower activity level, and complications (including, less commonly, re-tear) can occur.
Recovery after surgery is gradual and follows a structured rehabilitation program, with return to full, unrestricted activity commonly expected by around 6 months. Historically, recovery involved a period of limited weight-bearing and sometimes a brace, but recent high-quality research found that a faster protocol—allowing full weight-bearing as tolerated without a brace—achieved comparable strength, function, and re-injury results over two years. Your surgeon will tailor your specific rehabilitation plan.
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