Why this is different from a hamstring strain
Most hamstring injuries in rugby are muscle strains — the muscle fibres themselves tear somewhere along the back of the thigh. A proximal hamstring tendon avulsion is different. The tendon (the rope that anchors the muscle to the sitting bone) tears completely away from the bone. Imagine the rope unsnapping at the cleat rather than fraying in the middle. The two injuries look similar at first — pain, bruising, weakness — but the treatment and timeline are very different.
What it feels like
- Sudden, sharp pain deep in the buttock or upper back of the thigh — often described as feeling like being kicked or shot
- An audible pop or tearing sensation at the moment of injury
- Inability to keep running or accelerate; sitting on hard surfaces is painful
- Within 24–72 hours, a large bruise often appears in the back of the thigh, sometimes tracking all the way down to the knee
- A palpable gap or dimple high in the back of the thigh where the muscle has retracted away from the bone
How it happens in rugby
The classic mechanism is a forceful hip flexion with the knee straight — water-skiing accidents are the textbook example. In rugby it shows up as: slipping forward in a wet ruck, getting a leg trapped while the body twists forward in a tackle, hyperflexion at the hip during a sprawl, and occasionally during very heavy deadlifts or kettlebell swings.
Why MRI matters
Ultrasound can pick up some hamstring injuries but tends to underestimate proximal avulsions, especially how far the muscle has retracted from the bone. MRI shows exactly which tendons are torn (the hamstring has three — semitendinosus, semimembranosus, biceps femoris), how far they have pulled back, and whether the sciatic nerve is involved. The number of tendons torn and the retraction distance drive the surgical decision.
Surgery or not?
This is a conversation between you, an orthopaedic surgeon, and your physiotherapist. In general, complete two- or three-tendon avulsions with retraction greater than about 2 cm in an active athlete are repaired surgically because non-operative outcomes tend to be poorer — persistent weakness, chronic sitting pain, and increased risk of re-injury. Partial avulsions and minimally retracted tears may be managed non-operatively with close rehabilitation.