A hip flexor strain occurs when one or more of the muscles at the front of the hip are stretched or torn. The primary muscles involved are the iliopsoas group and the rectus femoris. These muscles are responsible for lifting the knee toward the chest and stabilizing the pelvis during walking, running, and jumping. Strains often happen during sudden explosive movements or repetitive overuse.
The severity of symptoms depends on the grade of the strain, ranging from a mild stretch to a complete muscle rupture.
Frontal Hip Pain: Sharp pain or a dull ache located where the thigh meets the pelvis.
Tenderness to Touch: Sensitivity when pressing on the muscles at the front of the hip.
Pain During Elevation: Increased discomfort when lifting the leg up, such as when climbing stairs or getting out of a car.
Swelling or Bruising: Visible inflammation or discoloration in the upper thigh or groin area.
Muscle Spasms: Involuntary twitching or cramping in the hip flexor region.
Weakness: Difficulty or pain when attempting to kick, run, or sprint.
Physical Examination
Imaging: X-rays are used to evaluate for soft tissue calcifications or bony abnormalities. While rarely needed for mild strains, an ultrasound or MRI may be used for severe cases to determine if the muscle has completely detached from the bone.
Most hip flexor strains heal with non-surgical care, focusing on a gradual return to activity. Initial treatment follows the RICE protocol: rest, ice, compression, and elevation. Once the acute pain subsides, physical therapy is crucial to address muscle imbalances and improve the flexibility of the hip and lower back. Strengthening the core and gluteal muscles helps reduce the future workload on the hip flexors. Platelet rich plasma (PRP) injections may be used depending on your activity level and severity of injury.
Grade 1 (Mild): Rest, ice, and gentle stretching; recovery in 1 to 3 weeks.
Grade 2 (Moderate): Physical therapy and a period of modified activity; recovery in 4 to 8 weeks.
Grade 3 (Severe): Extensive rehabilitation and occasionally surgical repair for complete tears.