Junior Fast Bowler Back Pain and Lumbar Bone Stress Injuries

Lumbar Spine Bone Stress Injuries are a significant issue in both female & male youth pace bowlers.

Australian research demonstrates the scale of the problem: approximately 21% of adolescent fast bowlers in one prospective study developed a lumbar bone stress injury during a single season.

In elite Australian cricket, the incidence reached 58.1 injuries per 100 player seasons among male pace bowlers under 20 & recurrent injuries accounted for approximately one-third of all cases.

Why teenage fast bowlers are particularly vulnerable.

The pars interarticularis is not a growth plate – but a bony bridge between the small facet joints of the spine. Lumbar bone stress injuries most commonly involve the posterior elements of the vertebrae, including the pars interarticularis and pedicle. An injury involving the pars may progress from an early bone stress reaction (brightness on MRI) to a stress fracture or spondylolysis if loading continues without adequate recovery.

The lumbar spine undergoes important structural development during and after the adolescent growth spurt. with lumbar vertebral maturation progressing rapidly from around 14 years of age and after peak height velocity (PHV).

Peak height velocity (PHV) is the maximum rate of growth in height during the adolescent growth spurt. On average, girls reach PHV around 11 to 12 years old (growing 8–10 cm/year), while boys reach it around 13 to 14 years old (growing 10–11 cm/year). The bone of the v vertebral body however will continue to mature into the late 20’s.

This means a teenage fast bowler may have reached their adult height while their lumbar spine is still developing the strength & capacity needed to tolerate repeated bowling loads. The period during and immediately after rapid growth may therefore be particularly vulnerable, especially when bowling speed and workload increase faster than the spine can adapt.

This often coincides with increases in bowling speed, training volume and competitive intensity—particularly between 13 and 17 years of age.

Pre Season Bowling

Cricket Australia’s Junior Pace Bowling Workload Guidelines are designed to reduce excessive lumbar loading while allowing young bowlers to develop progressively.

This involves sessions off a few steps, increasing to half a run & progressing to a full run (empty net).
Build number of balls gradually.
Begin bowling to an empty net and later, bowl to batters to increase intensity.

Pain with Bowling?

If any bowler experiences lower back pain when bowling, it is strongly recommended the bowler stops bowling and see a Sports & Exercise Physician or Sports Physiotherapist with experience managing these injuries before continuing to bowl.

Usually an MRI of the lumbar spine will demonstrate bone oedema (early bone stress) or a fracture line (stress fracture). The earlier we can pick it up – the sooner you are likely to play.

In Season Bowling Rules

For bowlers Under 17:

Do not bowl on consecutive days – aim for at least one bowling free day after bowling.
Bowl on no more than three days per week – including matches and training.
Bowl no more than five overs in one spell.

For bowlers aged 17–19 (with no back pain):

No more than two consecutive bowling days per week.
No more than four bowling days per week.
No more than six overs in one spell.

At training, bowlers should have at least 20 minutes between spells.

Match Day

During matches, Cricket Australia recommends waiting until the same number of overs as the completed spell have been bowled from the same end before beginning another spell. This will often provide approximately 30 minutes of recovery.

Bowling exposure across every team – including school, representative and club cricket must be included when calculating workload.

The key – recovery across the season

Single session deload: one week every 4–6 weeks – only one bowling session. Can do other skills.

Full week deload: a complete 7 – 10 day deload from bowling every 10–12 weeks.

The players who must consider significant management of load:

bowlers with a previous lumbar bone stress injury
those who have recently grown rapidly
those who are taller or bowl faster than their peers

Why pain relief is not enough.

Pain and bone recovery do not always follow the same timeline.

A 2022 study of 29 elite male fast bowlers found that those with lumbar stress fractures had lower lumbar bone mineral density at diagnosis + lumbar bone density decreased by a further 1.9–3.0% during the following 20–24 weeks and did not return to baseline until as late as 52 weeks after diagnosis.

This does not mean that every pain free bowler remains injured for a year. It does show that biological recovery and adaptation can continue after symptoms begin to improve.

Return to bowling decisions should therefore consider more than pain alone. It is a process that manages allm the loads through the lumbar spine when returning to play.

Lower back pain during bowling should always be assessed.

Cricket Australia recommends that a junior pace bowler who develops lower-back pain while bowling should stop bowling and be assessed.

Features that increase concern include:

Localised lower back pain during or after bowling.
Pain aggravated by arching, rotating or side bending.
Pain that returns during successive bowling sessions.
A recent increase in bowling frequency, volume, pace or spell length.
Bowling for several teams without coordinated workload monitoring.
A recent rapid growth spurt.
A previous lumbar bone stress injury.

These features do not confirm an injury but they warrant assessment rather than repeatedly testing whether the bowler can continue.

Return to bowling program.

Returning after a bone stress injury should be individualised and criteria based. It is important that it commences with complete radiological healing unless your Sports & Exercise Physician recommends otherwise.

The basic guidelines are:

Complete healing & resolution of bony oedema on MRI.
Pain free daily activities and rehabilitation exercises.
Before you return to bowl:
- Return to a modified strength program that limits axial loads and extension activities.
- Once returned to strength, return to a graded running program.
Add in one load & skill at a time – progressive running, throwing & cricket-specific conditioning.
A staged bowling program beginning below match volume and intensity.
Monitoring of symptoms, bowling frequency, spell length, intensity and recovery.
Coordination between the bowler, family, coach, physiotherapist and Sports Physician.
Follow up imaging when clinically indicated.

Progression should be based on the bowler’s response to each stage – not simply the number of weeks since symptoms began. Cricket Australia advises that a diagnosed LBSI may take approximately 6 – 12 months to recover from, making early recognition and appropriate workload management particularly important.

Key Messages for young bowlers.

Junior fast bowlers are particularly vulnerable to lumbar bone stress injuries because their spines are still developing while bowling speed and workload are increasing.
Lower back pain during bowling should not be ignored. The bowler should stop bowling and be assessed by a physiotherapist or sports doctor experienced in these injuries.
Being pain free does not necessarily mean the bone has fully recovered. Biological healing and adaptation can continue well after symptoms settle.
Cricket Australia’s age specific bowling limits, rest periods and gradual pre-season preparation should include every delivery bowled across school, club, representative and training commitments.
Returning to bowling should follow an individualised, criteria based progression that gradually increases frequency, spell length, volume and intensity while monitoring symptoms and recovery.

If you have sharp pain, swelling or pain with walking – have it assessed rather than trying to run through it.

Our physiotherapists at The Sports Physio Clinic can assess your back for a bone stress injury, refer you for an MRI and manage your recovery.