That nagging back pain… could it be causing your knee, ankle, or even neck issues? Discover the surprising connections and how BP Chiro can help you feel better, head to toe.

Think of your lower back, or lumbar spine, as more than just that part of your body that sometimes aches. It’s truly the foundation of how you move and feel.
It’s the strong base that supports your upper body, allowing you to bend, twist, and walk. But its job goes way beyond just being a structural marvel – it’s the central hub that keeps everything connected, influencing your well-being from head to toe.
Let’s dive into why looking after your lower back is so incredibly important for your overall health.
The Body’s Information Superhighway: Your Lumbar Nerves affecting your lower limb
Imagine a superhighway running through your lower back – that’s essentially what your nerve roots are. These vital nerves branch out from your spinal cord, acting as communication lines that send signals to and from your legs and feet, controlling everything from muscle movement to the sensations you feel.
But what happens when there’s a traffic jam on this highway? If your spine isn’t aligned just right, or if a disc puts pressure on a nerve (like a pesky pothole!), these signals can get disrupted. This isn’t just a local problem; the discomfort can travel, affecting areas you might not immediately connect to your back.


Affected Joint | Nerve Root | Key Muscle Innervation | Key Joint Innervation |
Hip Joint | Primarily L2-S1 | L2, L3: Iliopsoas (primary hip flexor), Adductors (inner thigh muscles). L4, L5: Gluteus Medius and Minimus (hip abductors and stabilizers). S1: Gluteus Maximus (powerful hip extensor), Hamstrings (assist in hip extension). | Sensory branches from these nerve roots contribute to the sensation and proprioception of the hip joint capsule and ligaments. |
Knee Joint | Primarily L3-S2 | L3, L4: Quadriceps (primary knee extensors). L5, S1, S2: Hamstrings (knee flexors). Sciatic Nerve (formed by L4-S3): Provides innervation to most muscles acting on the knee. | Sensory branches from these nerve roots innervate the ligaments and capsule of the knee joint, providing pain and proprioceptive feedback. |
Ankle Joint | Primarily L4-S1 | L4, L5: Tibialis Anterior (dorsiflexion – lifting the foot). L5, S1: Peroneals (eversion – turning the sole of the foot outward). S1: Gastrocnemius and Soleus (plantarflexion – pointing the toes). | Sensory branches from these nerve roots supply the ankle joint complex (talocrural, subtalar, etc.), contributing to sensation and proprioception crucial for balance and gait. |
For instance, if the L3/L4 nerve root gets irritated by the misalignment of the spine — it’s like stepping on a garden hose, interrupting the flow — that can lead to weakness in the Quadriceps muscle, which is important for Knee stability.
When this muscle isn’t working well, it’s harder for your knee to maintain stability and function of the knee joint during daily activity. This can cause uneven weight distribution within the joint, causing uneven wear and tear that may speed up the development of arthritis and degeneration over time.
The Domino Effect: How the Lower Back Impacts the Upper Body
The influence of the lumbar spine doesn’t stop at the lower limbs. Due to its position as the foundation of the entire spinal column, any misalignment or dysfunction in the lower back has a ripple effect upwards, impacting the cervical (neck) and thoracic (mid-back) spines through its biomechanical properties.


Imagine trying to build a tower on an uneven base. The upper levels will inevitably have to compensate to maintain balance. Similarly, when the lumbar spine is misaligned, the thoracic and cervical spines undergo compensatory movements as the individual attempts to perform everyday activities, including movements initiated in the lumbar region. Over time, this constant compensation leads to abnormal stresses and strains on the joints and soft tissues of the thoracic and cervical spine, potentially resulting in:
- Misalignment of the thoracic and cervical vertebrae.
- Degenerative changes and arthritis of the spine in the neck and mid-back.
- Nerve-related symptoms in the upper body due to irritation or compression of nerves in the thoracic and cervical regions, such as:
- Numbness or tingling in the hands and fingers.
- Pain radiating into the shoulders and arms.
- Headaches.
- Potentially even impacting breathing mechanics and causing a sensation of shortness of breath due to thoracic nerve involvement
Taking Charge: Looking After Your Body’s Foundation
The good news is that you can take steps to keep your lumbar spine healthy and prevent these knock-on effects. Regular exercise that strengthens your core and back, maintaining a healthy weight, practicing good posture whether you’re sitting or standing, and incorporating regular stretching can all make a huge difference. But if you’re already experiencing pain, it’s important to get professional help to address the root cause before it leads to more serious issues elsewhere.



Dr Angus Poh
B.Sc. (Hon) in Chiropractic
Malaysia Registered Chiropractor
Doctorate in Business Administration
Board Certified Naturopathic Doctor
Certified KinesioTaping Practitioner
Certified Dry Needling Practitioner
Reference:
1. Knee Joint Innervation – StatPearls [Internet]. (2022). StatPearls Publishing. https://www.ncbi.nlm.nih.gov/books/NBK519517/table/ch3.t3/
2. Hip Joint Innervation – StatPearls [Internet]. (2022). StatPearls Publishing. https://www.ncbi.nlm.nih.gov/books/NBK557752/table/article.t2/
3. How Does Spinal Misalignment Affect My Health? – Spine-health. (2017, December 18). https://www.spine-health.com/blog/how-does-spinal-misalignment-affect-my-health
4. Lumbar Plexus – Physiopedia. (n.d.). Retrieved from https://www.physio-pedia.com/Lumbar_Plexus
Living With Chronic Pain – Arthritis Foundation. (n.d.). https://www.arthritis.org/health-wellness/body-mind-spirit/emotional-well-being/living-with-chronic-pain
5. The Role of Proprioception in Joint Stability, Protection, and Rehabilitation: A Narrative Review – PMC. (2020). https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7355678/
6. Neck Pain and Chiropractic – American Chiropractic Association. (n.d.).
https://www.acatoday.org/Patients/Health-Wellness-Information/Neck-Pain-and-Chiropractic