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A lumbar (lower back) disc injury typically involves disruption, injury or degeneration of the intervertebral disc in the lower end of the spine (commonly to the L4/L5 or L5/S1). It may range from an array of types of injuries to the disc. These are disc degeneration, disc bulge, disc protrusion, disc extrusion, or disc sequestration, potentially causing nerve root compressionThe Lumbar spine consists of five vertebrae (Spinal bones) named L1,L2, L3, L4, L5. These spinal bones primarily protect the spinal cord and support the body to allow for mobility. The main movement enabled by a lumbar spine is flexion and extension (bending forwards and backwards), with mobility also allowing for some side to side and rotation movements. The Discs act as shock absorbers between each vertebrae and allow movements between each vertebrae. The anatomy of the lumbar disc consists of an inner gel-like substance core called the nucleus pulposus. This is surrounded by a tougher external layer called the annulus fibrosus. There are also ligaments that surround the discs along the spinal column that create more stabilisation to these structures. When movements are completed such as forward flexion, the disc becomes squished and it is forced to translate backwards. So what may happen to the disc in the case of a lumbar disc injury? Commonly when a lumbar disc is injured it is due to either an accumulation of load or stress or an acute disproportionate stress placed on the structure, causing there to be injury to the disc either by irritation of the annulus fibrosus or specific pathology sustained. This can be from activities such as lifting or bending-based manoeuvres. Often forward bending, lifting or prolonged sitting can be difficult and painful, whereas standing and walking can be relieving. Pathology in more severe presentations may be from the nucleus pulposus being forced to break through the outer annulus fibrosis layers (herniation). This term is an umbrella term that can further be sub-categorised depending on how far it has been pushed out. Regardless of its herniation factor, all these types of injuries may irritate nearby structures including the spinal nerves, resulting in the potential to have referred lower limb pain, sensation deficits and even strength alterations. Imaging: Lumb disc injuries can undergo many different types of imaging to help with diagnosis. When investigating a lumbar disc injury, different types of imaging may be used depending on your symptoms and clinical findings, there is no one specific gold standard. MRI (Magnetic Resonance Imaging) is the most common and effective scan for detecting disc bulges, herniations, and nerve involvement. It provides detailed images of soft tissues without using radiation. CT scans are useful for assessing bones and may be recommended if an MRI is not suitable, particularly in relation to cost, though they do provide less detail of soft tissue. X-rays are often used as a first-line scan to rule out fractures or spinal alignment issues, but they cannot show disc or nerve problems. In some cases, a CT myelogram, a more specialised scan involving contrast dye, may be used when additional detail is needed or if an MRI cannot be performed. Most disc injuries improve with conservative care, and imaging is only recommended when necessary to support diagnosis or guide treatment. Lumbar disc injury types: 1) Disc degeneration: Disc degeneration refers to the degeneration and breakdown of the discs in the spine. As we lose the liquid content/hydration of the disc they begin to become shorter and more prone to not absorbing load well, dis-enabling quality movements and narrowing the spinal canal. This can be associated with pain and stiffness. Although this is a natural part of aging, it can also be catalysed by injury and repetitive stress.2) Disc bulge: A disc bulge occurs when the disc’s outer layer (annulus fibrosus) is weakened or stressed and the inner gel like substance (nucleus pulposus) bulges outwards. It has the potential to irritate structures such as the nerves and cause pain, sensation alterations (numbness, tingling etc), and referral into the lower limb. It is not as serious as the following types explained.3) Disc Herniation: A disc herniation can be categorised more specifically as either an extrusion or sequestration. An extrusion is when the nucleus pulposus breaks through the annulus fibrosis but it remains connected to the main disc, while sequestration is when a portion of the nucleus breaks off completely and moves away from the main disc. Sequestration is considered a further stage to disc herniation compared to disc extrusion. The displaced fragment can cause significant pain and neurological symptoms by irritating or compressing nerves. What does the evidence show for disc injuries correlated to imaging for asymptomatic individuals vs symptomatic individuals ? It is essential to keep in mind that many research literature has shown that when imaging is completed there is a high number of asymptomatic individuals who in their results illustrate having pathology. These are people who are functional or don’t have present pain. Some of the statistics around this demonstrate 37% of 20 year olds have disc degeneration and 50% at 30 years old. These people are all symptomatic. It also illustrates that 30% of 20 year olds and 40% of 30 year olds have disc bulges. The take home message here is that a large portion of people who have these seemingly severe pathologies are functioning well and have no pain, highlighting the importance of utilising these results in conjunction with clinical assessments. This is why it is important to see your physiotherapist and not be completely misguided or demoralised by imaging alone. Treatment/Management: Everyone will be diXerent due to the type and severity of the injury. Some of the following are methods of treatment and management for lumbar disc injuries. These will all be individualised and provided appropriately based on the clinical presentations assessed by your physiotherapist. 1) De-loading and rest: Initially it is important that we respect the body’s pain and healing time parameters. Therefore, having a period of rest and de-loading is essential to begin recovery. This does not mean to strictly sit on the couch and do nothing, it is more related to avoiding and minimising aggravating movements such as bending, lifting and sitting for sustained periods. 2) Manual therapy: Your physiotherapist may use diXerent hand-on techniques such as soft tissue work and mobilisations to improve your pain and mobility. Other techniques such as dry needling and cupping may be utilised on a case by-case basis. Taping may also be applied acutely to help support your lower back into a better posture to encourage de-loading and restricting painful motions to help with pain and healing. 3) Medical/Referral: Your physiotherapist may provide education regarding the use of over-the-counter lower dose anti-inflammatory medications such as ibuprofen, and pain killers like paracetamol. This is encouraged to be discussed with your medical professional. In addition, if stronger anti-inflammatories or the use of muscle relaxant medications are indicated, this will be prescribed in conjunction with your medical professional’s opinion. Unfortunately, in some more severe scenarios it may be necessary to be referred for certain imaging (as explained earlier) or even a specialist review for their opinion on management. 4) Early gentle movements: Early movement via pain-free tolerated gentle exercises can be vital in reintroducing and desensitising normal movement behaviour patterns, as well as improving or minimising further decline in mobility. 5) Education: Advice surrounding correct postures, biomechanics and lifting techniques will be shared to enable you with the best tools, knowledge and pacing strategies to improve and sustain your long-term health. 6) Exercise-rehab: Your physiotherapist will formulate and integrate an individualised tolerable progressive rehab program (including core, back and lower limb strength/mobility). This will aid to improve pain, mobility and strength so that you can return in a graded manner to your work, daily tasks and leisure activities.