Hamstring muscle strain: understanding your thigh pain and getting back to activity

What is a hamstring muscle strain?

Hamstring anatomy

The hamstrings are a group of three muscles at the back of the thigh, which flex the knee and extend the hip. They’re particularly stressed during sprinting, especially during the late swing phase where they decelerate the leg before the foot lands, which makes this one of the most common muscle injuries in sport.

Why does this muscle get injured?

A hamstring strain most often occurs during a maximal-speed sprint, particularly during the deceleration phase of the leg before the foot lands. Insufficient warm-up, muscle fatigue, a strength imbalance between the hamstrings and quadriceps, or a history of incompletely rehabilitated injury are major risk factors.

Symptoms and diagnosis of a hamstring muscle strain

Recognising the symptoms

The pain appears suddenly at the back of the thigh during an effort, often described as feeling like a “stab”, sometimes accompanied by an audible snap. It intensifies when stretching the muscle, on resisted knee flexion, and when walking briskly. Bruising can appear in the following days, more or less extensive depending on the severity of the injury.

Differential diagnosis

Other pain at the back of the thigh can sometimes be mistaken for a hamstring muscle strain:

• Hamstring tendinopathy, a pain that develops gradually, linked to overuse rather than a sudden trauma
• Referred sciatic pain, radiating from the lower back or buttock along the path of the sciatic nerve, with no direct link to a sprinting effort

Causes and risk factors of hamstring muscle strains

A hamstring strain most often occurs during a maximal-speed sprint, but several factors clearly increase the risk of injury.

Factors that increase the risk

• Insufficient warm-up before an explosive effort
• Muscle fatigue late in a match or session
• A strength imbalance between the hamstrings and quadriceps
• A lack of flexibility or reduced hip range of motion
• A previous injury to this same muscle that wasn’t fully rehabilitated

Which sports contribute to hamstring muscle strains?

Any sport with maximal-speed sprinting particularly exposes this muscle group:

• Athletics (sprinting, hurdles)
• Football and rugby
• Basketball and handball
• Combat sports with accelerations
• High-intensity running
• Team sports with repeated sprints

Treating a hamstring muscle strain in rehab with a sports physio

The goal of treatment is to allow the muscle to heal under good conditions, then progressively restore its strength and capacity to absorb sprinting demands, to prevent the recurrence that’s very common with this muscle.

1. 1Protection and relative rest of the area
2. 2Gentle hip and knee mobility
3. 3Light isometric contractions
4. 4Progressive concentric strengthening
5. 5Eccentric strengthening
6. 6Full leg chain work
7. 7Reintroducing sport-specific movements (running, striking)
8. 8Strengthening under sport-specific load
9. 9Progressive return to your sport
10. 10Return to competition

“A poorly managed muscle injury is the best way to get hurt twice in the same place.”

Eccentric strengthening, the cornerstone of treatment

Eccentric strengthening of the hamstrings, particularly “Nordic hamstring” type exercises, is the most scientifically documented protocol for reducing the risk of recurrence in this muscle, far more than standard strengthening alone.

In brief

• Isometric then progressive concentric strengthening
• Intensive eccentric strengthening (Nordic protocol)
• Rebalancing with the quadriceps
• Gradual return: mobility, then load, then sport

Should you rest or keep playing sport?

Prolonged total rest isn’t recommended: it causes loss of muscle mass and strength, which increases the risk of recurrence. It’s better to temporarily adapt your activity, avoiding sprinting, while quickly starting active, progressive rehab.

When should you see a specialist for a hamstring strain?

If you feel sudden pain accompanied by a “pop”, visible deformity of the muscle, or significant bruising, prompt medical attention is needed to rule out a complete rupture, particularly at the upper attachment (near the buttock).

Recovery time for a hamstring muscle strain

Recovery time depends directly on the grade of the injury and its location.[1] A simple strain (grade 1) usually recovers in one to two weeks. A partial tear (grade 2) generally requires 3 to 8 weeks of rehab. A more severe injury at the upper attachment, near the buttock (grade 3), can require several months before a full return to sprinting.

Preventing re-injury

Since the hamstrings have the highest recurrence rate of any muscle in the body, several measures can significantly reduce this risk:

• Regular eccentric strengthening, such as “Nordic hamstring” exercises, even outside injury periods[2]
• A complete dynamic warm-up before any high-intensity effort
• Progressively managing running speed on your return, without rushing back to maximal sprinting
• Rebalancing strength between the hamstrings and quadriceps
• Not returning to competition before the strengthening protocol is fully complete, even if you’re pain-free

The HOPP care programmes to treat your hamstring strain and get back to sport

This muscle strain, particularly prone to recurrence, requires rigorous eccentric strengthening before any full return to sprinting. HOPP offers you a precise exercise programme, allowing you to get back to your activities as quickly as possible.

The programme runs from 3 to 9 weeks depending on the injury and ends with a reconditioning phase allowing a return to competition in the best possible conditions. Each programme is designed by the HOPP team, made up of two sports physiotherapists who are experts in assessing and treating athletes. You’ll also find theoretical content throughout your progression, so you master every aspect of your recovery and can adjust your treatment independently. If needed, our team of physiotherapists is on hand to support you.

A programme that adapts to you every day

Every day, how you feel (RPE) is factored in to automatically adjust the rest of your programme: more load if all is well, a bit less if your thigh is complaining. This daily personalisation is what makes the difference compared to a fixed, paper-based programme.

Ready to start your programme?

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