Rectus femoris tendonitis is an overlooked cause of pain at the front of the hip and groin. It’s an overuse injury of the rectus femoris tendon, common in kicking and sprinting sports. Because the symptoms overlap with other causes of anterior hip pain, it’s easily missed. So what is rectus femoris tendonitis, and how do we treat it?
What is rectus femoris tendonitis?
The rectus femoris is one of the four quadriceps muscles, and the only one that crosses both the hip and the knee. At the top, its tendon attaches to the front of the pelvis by two heads — a direct head, onto a bony point called the anterior inferior iliac spine, and an indirect head, onto the rim of the hip socket. Tendonitis (more accurately tendinopathy) develops at this upper attachment from repetitive overload, causing pain at the front of the hip.
What causes rectus femoris tendinopathy?
The usual cause is repetitive overload of the tendon — especially explosive hip flexion and kicking. It’s common in footballers, sprinters, and dancers. Risk factors include a sudden increase in training, poor flexibility, weak hip and core muscles, and a previous injury to the area. In adolescents, the equivalent overload can affect the growth plate at the same spot, causing an apophysitis or an avulsion rather than a tendinopathy.
Symptoms of rectus femoris tendonitis
Typical features include:
- Pain at the front of the hip or groin, worse with activity
- Pain on kicking, sprinting, or bringing the knee up towards the chest
- Tenderness over the front of the hip, at the tendon attachment
- Pain reproduced by resisted hip flexion, or by stretching the quadriceps
- A deep ache that eases with rest and returns on activity
What else can cause anterior hip pain?
Because several conditions cause pain at the front of the hip, an accurate diagnosis matters. The main alternatives include hip impingement (FAI) and labral problems, iliopsoas tendinopathy or bursitis, hip osteoarthritis, a hip flexor or groin strain, a femoral or pubic stress fracture, and referred pain from the lower back. In adolescents, an apophysitis or avulsion at the same attachment should be considered.
How is rectus femoris tendinopathy diagnosed?
Diagnosis combines the history and examination with imaging:
- Ultrasound — a practical, dynamic way to show tendon thickening, degeneration, or calcification, and to guide any injection
- MRI — gives a clear view of the tendon and the surrounding hip, and excludes other causes such as a labral tear, stress fracture, or hip arthritis
- X-ray — useful to look for calcification or a bony avulsion in a younger athlete
How is rectus femoris tendonitis treated?
As with other tendon problems, treatment is led by rehabilitation, rather than injections.
First-line treatment
- Activity modification — reducing the explosive hip flexion and kicking that aggravate the tendon
- Progressive strengthening — a structured programme for the quadriceps, hip flexors, and core, which is the mainstay of recovery
- Addressing the cause — flexibility, training load, and technique
If the tendon doesn’t settle
- Shockwave therapy — useful for a stubborn tendinopathy, particularly where there’s calcification
- Barbotage — where there’s a calcific deposit in the tendon, an ultrasound-guided barbotage can break down and remove the calcium
- A PRP (platelet-rich plasma) injection — sometimes used to support a degenerate tendon, under ultrasound guidance
Cortisone is generally avoided in tendon problems like this — it doesn’t heal the tendon and can weaken it — so treatment focuses on rehabilitation, shockwave, and, where appropriate, PRP or barbotage. Surgery is rarely needed.
Frequently asked questions about rectus femoris tendonitis
Where is rectus femoris tendinopathy felt?
At the front of the hip or groin, where the rectus femoris tendon attaches to the pelvis. The pain is typically worse with kicking, sprinting, or lifting the knee towards the chest, and is reproduced by resisted hip flexion or quadriceps stretching. It usually eases with rest and returns with activity.
Is rectus femoris tendonitis the same as a hip flexor strain?
They’re related but not identical. A hip flexor strain is an acute tear of the muscle, while rectus femoris tendonitis is an overuse problem of the tendon at its attachment. They can feel similar, which is why examination and imaging are used to tell them apart — and because the rectus femoris is also a hip flexor, the two can overlap.
Should I have a cortisone injection for it?
Usually not. Cortisone doesn’t heal a tendon and may weaken it, so it isn’t the treatment of choice for rectus femoris tendonitis. The focus is on rehabilitation, with shockwave therapy, barbotage (for calcification), or PRP considered if the tendon is slow to settle. An accurate diagnosis comes first, so the right treatment is chosen. For calcification, a barbotage procedure combined with a small dose of cortisone is a reasonable option.
How long does rectus femoris tendonitis take to heal?
It varies, but tendon problems generally take time — often a few months of progressive rehabilitation. The timeline depends on how long it’s been present and how well the aggravating load is managed. Most people recover well without surgery, provided the tendon is loaded progressively and the underlying cause is addressed.
Final word from Sport Doctor London about rectus femoris tendonitis
Rectus femoris tendonitis is an overlooked cause of anterior hip and groin pain, common among athletes who kick and sprint. Because several conditions cause pain at the front of the hip, an accurate diagnosis — with ultrasound or MRI — is the key to the right treatment. Rehabilitation leads the way, with shockwave, barbotage, or PRP reserved for stubborn cases, and surgery rarely needed.
If you have persistent pain at the front of your hip, Dr Masci can assess you in London, including ultrasound in clinic. Contact the team here or call +44 (0) 203 488 0350.
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