Femoral Neck Stress Fractures in Runners and Athletes

Understanding hip stress injuries and how to recover safely

For runners and active people, hip or groin pain can be frustrating and sometimes confusing. Symptoms may appear gradually during training, improve with rest, and then return when activity increases again.

In many cases these symptoms relate to muscles, tendons, or joint irritation. Occasionally, however, the bone itself can become overloaded. One example is a femoral neck stress injury — an overuse injury affecting the upper part of the thigh bone near the hip.

These injuries are relatively uncommon but important to recognise early, particularly in runners and athletes who regularly train with impact activities. The encouraging news is that with early assessment and the right management, most people recover well and return to the sports they enjoy.

What Is a Femoral Neck Stress Fracture?

The femoral neck is the narrow section of bone connecting the ball of the hip joint to the shaft of the thigh bone. It plays a key role in transferring force through the hip during activities like walking, running, and jumping.

During running, the femoral neck can experience several times body weight with each stride.

A stress fracture develops when repeated loading exceeds the bone’s ability to repair itself. Rather than a sudden break from trauma, microscopic damage gradually builds up within the bone.

These injuries exist along a spectrum:

• Bone stress reaction – early irritation within the bone

• Stress fracture – a small crack in the bone

• Displaced fracture – a more serious stage where the bone shifts out of place

Most runners who develop symptoms present earlier on this spectrum, allowing treatment to focus on recovery and safe return to sport.

Why Do These Injuries Occur?

Running places repetitive load through the hips and legs. In most situations the body adapts well — bone actually becomes stronger when training is progressed gradually.

Problems tend to arise when loading increases faster than the body can adapt.

Femoral neck stress fractures are most commonly seen in:

• Distance runners

• Track and field athletes

• Military recruits

• Active individuals increasing training volume quickly

Although they are relatively rare, they are considered an important injury to recognise early because the femoral neck plays such a central role in weight-bearing through the hip.

Common Risk Factors

Most stress injuries occur when several small factors combine, rather than a single cause.

Some factors that may increase risk include:

• Rapid increases in running distance or intensity

• Sudden changes in training surfaces or footwear

• Reduced bone density

• Muscle fatigue or reduced strength around the hip

• Biomechanical factors affecting load through the hip

• Inadequate recovery between training sessions

For many runners, the most significant factor is simply training load increasing too quickly for the body to adapt.

Menstrual Cycle, Hormones, and Femoral Neck Stress Fractures

Hormonal health can influence bone strength, which is why menstrual history is often considered when assessing stress fractures in female runners and athletes.

Oestrogen plays an important role in maintaining bone density and supporting normal bone repair. When oestrogen levels are lower — for example with irregular periods, missed periods (amenorrhoea), or very long menstrual cycles— bone turnover can be affected and bones may become more vulnerable to stress injuries. 

In female endurance athletes, menstrual disturbances are commonly associated with lower bone mineral density and a higher prevalence of stress fractures. 

This relationship is often discussed within the context of the Female Athlete Triad or Relative Energy Deficiency in Sport (RED-S), where low energy availability, menstrual dysfunction, and reduced bone density occur together. These factors can increase the likelihood of bone stress injuries, including those affecting the femoral neck. 

Hormonal changes across life stages may also influence bone health. For example:

• Delayed onset of menstruation (menarche) may reduce early oestrogen exposure during key years of bone development.

• Irregular or absent menstrual cycles in athletes can signal hormonal disruption that may affect bone strength.

• Perimenopause and menopause involve natural declines in oestrogen, which can gradually reduce bone density. 

For active women and runners, menstrual health can therefore provide useful insight into how the body is adapting to training. Changes in cycle patterns don’t necessarily mean an injury will occur, but they can sometimes highlight areas where training load, recovery, or nutrition may need adjustment.

When assessing bone stress injuries such as femoral neck stress fractures, clinicians often consider training load, biomechanics, nutrition, and hormonal health together, as these factors work closely together in maintaining healthy bone.

Symptoms Runners Should Watch For

Femoral neck stress injuries usually develop gradually.

The most common symptom is deep pain in the groin or front of the hip during activity.

Many runners notice:

• Pain during running that improves with rest

• Symptoms returning earlier in each run

• Discomfort that lingers after training

• Pain occasionally spreading into the thigh or knee

Over time the pain may begin to appear with everyday activities such as walking.

Because these symptoms can feel similar to muscle or tendon injuries, they can sometimes be mistaken for other hip or groin problems.

If groin pain persists for more than a couple of weeks despite reducing training, it is usually worth getting it assessed.

How Are Femoral Neck Stress Fractures Diagnosed?

Diagnosis typically involves a combination of clinical assessment and imaging.

Clinical assessment

A physiotherapist or sports doctor will usually ask about:

• Training history and recent changes in load

• Pain patterns and activity tolerance

• Running habits and recovery

• Hip movement and strength

Understanding the bigger picture is often just as important as the physical exam itself.

Imaging

Early stress injuries often do not show on X-rays, particularly in the first few weeks.

Because of this, MRI scans are often used when a bone stress injury is suspected, as they can detect early changes within the bone and help guide management.

Why Early Assessment Matters

Femoral neck stress fractures are sometimes described as “high-risk” stress fractures, mainly because of the important role the femoral neck plays in supporting body weight.

If a fracture progresses or shifts out of position, complications can occur.

However, the key message for most runners is reassuring:

When these injuries are recognised early and managed appropriately, outcomes are generally very good.

Early assessment simply allows clinicians to guide the safest pathway for healing and return to activity.

Treatment and Rehabilitation

Treatment depends on the severity and location of the stress injury.

Many cases can be managed without surgery, particularly when identified early.

Temporary reduction in running

Initially, reducing load through the hip allows the bone time to recover.

This may involve:

• Taking a break from running

• Reducing weight-bearing activity

• Using alternative exercise such as cycling or swimming

Protecting the bone while it heals

In some cases clinicians may recommend temporarily reducing weight-bearing with crutches to limit stress on the femoral neck during the early healing phase.

Strength and rehabilitation

Rehabilitation focuses on restoring strength and load tolerance around the hip and pelvis.

Programs often include:

• Hip and glute strengthening

• Core control exercises

• Progressive impact training

• Running retraining if needed

Gradual return to running

Once symptoms settle and healing progresses, running is reintroduced gradually through a structured return-to-run program.

This typically includes:

• Walk-run intervals

• Gradual distance increases

• Monitoring symptoms carefully

Return timelines vary, but many runners return to full training within several months depending on the severity of the injury.

Preventing Future Stress Injuries

While not all injuries are preventable, several strategies can help reduce risk.

Gradual training progression - Avoid sudden increases in distance, speed, or intensity.

Strength training - Strong hips and legs help absorb load during running.

Adequate nutrition - Energy availability, calcium, protein, and vitamin D all support bone health.

Listening to early warning signs - Pain that gradually worsens with running is worth paying attention to.

Seeking advice early often makes recovery smoother and helps prevent small problems from becoming bigger ones.

The Takeaway for Runners

Femoral neck stress fractures are uncommon but important overuse injuries, most often affecting runners and athletes exposed to repetitive impact loading.

They usually develop gradually when training stress exceeds the body’s ability to adapt.

The encouraging news is that with early recognition, appropriate rest, and structured rehabilitation, most people recover well and return to running confidently.

If hip or groin pain is affecting your running or training, a physiotherapist can help identify what may be driving the symptoms and guide the next steps.

The team at Body Fit Physiotherapy is always happy to help if you’d like support.