Hip Flexor vs Groin Strain: How to Tell the Difference

Why They’re Confused: Overlapping Anatomy

The hip flexors and groin muscles (adductors) attach in close proximity at the front of the pelvis and upper thigh. Both can produce "front of hip" pain, and both are common in sports that involve kicking, sprinting, or sudden direction changes (hockey, soccer, basketball — Canada’s most popular sports).

However, the treatment approach differs significantly: hip flexor strains respond to hip extension stretching and progressive flexion strengthening, while adductor strains require adduction-specific loading protocols like the Copenhagen adductor exercise.

Location-Based Diagnosis

Hip Flexor (Iliopsoas) Strain

• Pain is deep in the front of the hip, slightly below the crease where your thigh meets your torso
• May radiate into the lower abdomen or toward the lower back
• Worse when lifting your knee toward your chest, especially against resistance
• Tender to palpation just below the inguinal ligament (the crease line)

Groin (Adductor) Strain

• Pain is inner thigh, closer to the pubic bone
• Radiates down the inner leg, sometimes to the knee
• Worse when squeezing your legs together (think squeezing a ball between your knees)
• Tender along the inner thigh muscle belly or at the pubic bone attachment

Self-Tests to Distinguish

Test 1: Resisted Hip Flexion

Sit on a chair. Try to lift your thigh against your hand pressing down. Pain = hip flexor strain.

Test 2: Resisted Adduction

Lie on your back. Place a pillow or ball between your knees. Squeeze. Pain in the inner thigh = adductor/groin strain.

Test 3: Active Straight Leg Raise

Lie flat. Lift one leg straight up (hip flexion). Deep hip pain = hip flexor. Inner thigh pain = adductor (because adductors assist flexion above 70°).

Test 4: Side-Lying Adduction

Lie on your side (affected leg down). Lift the bottom leg up toward the ceiling. Pain = adductor strain.

Recovery Timelines

Hip flexor strain (Grade 1–2): 2–6 weeks with progressive loading. Grade 1 (mild) typically resolves in 10–14 days. Grade 2 (moderate, partial tear) takes 4–6 weeks.

Groin/adductor strain (Grade 1–2): 4–8 weeks. Adductor strains tend to be slower healing due to the tendon-bone junction being a common site of injury (less blood supply than mid-belly tears).

When to see a physiotherapist: If pain hasn’t improved after 2 weeks of relative rest, if you can’t walk without limping, or if the injury happened with an audible pop/snap. In Canada, you can see a physiotherapist without a doctor’s referral in all provinces.

Prevention for Both

Both injuries share a common risk factor: inadequate warm-up before explosive movements. The evidence-based prevention approach:

• Dynamic warm-up: Leg swings (front-to-back AND side-to-side), walking lunges, lateral shuffles — minimum 5 minutes before sport
• Copenhagen adductor exercise: The single most effective exercise for preventing groin injuries (65% reduction in soccer players per the Harøy et al. 2019 RCT)
• Active hip flexor strength: Hanging knee raises, psoas marches, standing single-leg holds — build capacity so the muscle can handle sudden demands

Frequently Asked Questions

How do I know if I have a hip flexor or groin strain?

Hip flexor pain is deep in the front of the hip and hurts when lifting your knee. Groin pain is on the inner thigh near the pubic bone and hurts when squeezing your legs together. Do the resisted hip flexion test and the squeeze test to confirm which one you have.

Can a hip flexor strain cause groin pain?

Yes, there can be overlap. The iliopsoas attaches near the adductor longus, and a severe hip flexor strain can refer pain toward the inner thigh. However, true groin pain (worse with squeezing) usually indicates adductor involvement. A physio can differentiate with clinical testing.

How long does a hip flexor strain take to heal?

A mild (Grade 1) hip flexor strain heals in 10–14 days. A moderate (Grade 2) strain takes 4–6 weeks. Complete rest isn’t recommended — gentle movement and progressive loading within pain-free range speeds recovery. See a physiotherapist for a graded return-to-activity plan.