Proximal Hamstring Tear: When a Pulled Hamstring Needs Surgery

A buttock pop during sprinting or water-skiing can mean the hamstring tendons pulled away from the pelvic bone — a proximal hamstring avulsion — rather than a routine strain. Physical therapy is reasonable for many partial or less-retracted tears. A complete avulsion, substantial tendon retraction, persistent weakness, or high athletic demands may favor surgical repair after MRI and an orthopedic evaluation.

You felt a pop high in the buttock. Now sitting hurts, your stride feels weak, and the phrase "pulled hamstring" does not explain why walking is difficult. That pattern deserves a closer look.

A routine hamstring strain occurs within the muscle or at the muscle-tendon junction. A proximal hamstring avulsion occurs higher up, where one or more hamstring tendons attach to the sitting-bone area of the pelvis. Sprinting, sudden acceleration, and water-skiing can produce this injury. Hamstring injuries are also recognized in watersports, and MRI helps classify the injury and guide treatment.

What the buttock pop may mean

The hamstring group includes three major tendons near the pelvis. A forceful hip bend combined with knee straightening can overload that attachment. A pop followed by bruising, pain near the buttock, weakness with the leg extended, or pain while sitting raises concern for an avulsion rather than a simple midsubstance strain.

The location matters. Pain in the middle of the back of the thigh is more typical of a muscle-tendon injury. Pain at the lower buttock, especially with immediate weakness or extensive bruising, is more concerning for a proximal injury. Symptoms alone cannot show how many tendons are involved or how far they have pulled away.

The test that usually answers the question

An orthopedic examination checks hamstring strength, tenderness, bruising, gait, and nerve symptoms. MRI can show whether the injury is a strain, partial avulsion, or complete rupture, and whether the tendon has retracted from its attachment.

That distinction changes the conversation. A mild strain usually progresses through rehabilitation. A complete proximal avulsion may leave persistent weakness if the tendon does not return to its attachment. Delayed diagnosis can also make repair more difficult and outcomes less predictable, particularly in chronic complete injuries.

Is physical therapy reasonable?

Often, yes. Nonoperative care can be reasonable for a partial tear with limited retraction, lower activity demands, or a patient who prefers to avoid surgery. It usually involves activity modification followed by supervised rehabilitation that gradually restores motion, strength, and sport-specific function. The plan should be based on the MRI pattern and examination, not on the word "strain" alone.

The strongest recent randomized evidence does not support automatic surgery for every proximal hamstring avulsion. In adults aged 30 to 70 with proximal hamstring avulsions, the PHACT trial found nonoperative treatment was noninferior to surgical reinsertion for the Perth Hamstring Assessment Tool score at 24 months. Lower Extremity Functional Scale results were also similar, and more adverse events were observed after surgery.

That result supports a shared decision. It does not mean every tear has the same prognosis, or that an athlete with a large, retracted avulsion has the same priorities as someone whose main goal is comfortable daily activity.

When repair becomes more attractive

Surgery is more often considered when MRI shows a complete avulsion, multiple tendons involved, meaningful retraction, or a partial avulsion that remains painful and weak despite rehabilitation. A commonly used threshold in active patients is more than 2 centimeters of retraction, although the decision depends on the entire injury pattern and the patient's goals.

A matched comparative study followed patients for more than four years and included complete avulsions, partial tears with more than 2 centimeters of retraction, and patients who had failed six months of nonsurgical treatment. In that selected population, surgical treatment was associated with better functional and activity scores, greater satisfaction, and higher return-to-sport rates than nonsurgical care.

This study was not a randomized trial, so treatment selection may have influenced the results. It does, however, support repair as a reasonable option when the tear is large or retracted and restoring demanding activity is a major priority.

What about athletes?

Return to sport depends on tendon involvement, retraction, strength loss, the sport itself, and the quality of rehabilitation. It should be based on function rather than a calendar date alone. Running, sprinting, cutting, and water-skiing place different demands on the hamstring than walking or cycling.

A systematic review of surgical repair outcomes reported that professional athletes had an overall return-to-sport rate of about 95.6%, with reported return times ranging from three to seven months. The review reported a lower rate, about 64.8%, among nonprofessional athletes. It also found relatively low rates of complications, although the included evidence came from level III and IV studies rather than randomized trials.

Those numbers describe groups, not a promise for one person. A return to sport also does not always mean return to the same speed, workload, or confidence. Your surgeon and physical therapist should assess strength, control, running mechanics, and sport-specific tasks before clearance.

Consensus guidance for athletes with hamstring strain injury also emphasizes accurate diagnosis, staged rehabilitation, and criteria-based return to sport rather than rushing back on a fixed timeline.

Acute versus chronic injury

An acute injury is diagnosed soon after the event. A chronic injury has been present long enough for scar tissue, tendon retraction, weakness, or altered movement to develop. Early assessment is useful because a repair may be more straightforward before the tendon retracts and the tissue changes.

Chronic injuries can still be treated, but the operation and recovery may be more complex. Reconstruction or graft augmentation may be discussed when the tendon cannot be repaired directly to bone. Outcomes are less predictable for chronic complete avulsions than for acute injuries.

What to do after the injury

Do not test the hamstring with sprinting, aggressive stretching, or a return to water-skiing while you are still weak or limping. Arrange an orthopedic or sports-medicine evaluation promptly, particularly if you felt a buttock pop, developed marked bruising, or cannot walk normally.

Bring the exact injury date and describe the movement that caused it. Ask whether the MRI shows a strain, partial avulsion, or complete avulsion; how many tendons are involved; and whether there is retraction. Those answers provide a more useful treatment plan than the label "pulled hamstring."

How I approach proximal hamstring repair

I have focused my practice on hip arthroscopy and hip preservation for nearly twenty years. Proximal hamstring tears sit at the edge of that work: they are not inside the hip joint, but they demand the same precision around the pelvis, the sciatic nerve, and the soft-tissue attachments that load every step and stride.

When surgery is the right choice, I often use an endoscopic repair. I work through small incisions with a camera and instruments — the same kind of arthroscope used in joint surgery — to see the tendon footprint on the sitting bone, protect the sciatic nerve, and reattach the tendons. That is not true arthroscopy. Arthroscopy means working inside a joint. This repair is outside the joint. The goal is a durable anatomic repair with less soft-tissue disruption than a traditional open approach, when the tear pattern allows it.

For chronic, retracted avulsions in which the native tendon cannot reach the bone cleanly, reconstruction — including endoscopic-assisted reconstruction with allograft when needed — may be part of the plan. The decision follows the MRI, the examination, and what you need to get back to doing.

The objective is straightforward: restore strength and sitting comfort, protect the nerve, and return you to activity as soon as the repair and rehabilitation allow — with the most reliable result we can achieve for your specific injury.