Ok, so we have talked about the neck and the upper b
ack in Part 1 and Part 2. Now, its time to talk about one of the most injured and problematic areas of the body, the lower back. To give you an idea about how much lower back pain affects the general population, it is the number two reason for missed work just behind the common cold. Eighty percent of people at some point will experience low back or lumbar spine pain. This post is going to discuss some basic anatomy, common problems, and some easy things that you can do to help with your back pain (easiest is to check out this post). I apologize in advance for the length of this post, but trust me when I say there is a ton of information that you don’t want to miss! If you are just looking for the exercises, jump to the bottom where they are listed. As always the information here is not a substitute for seeing a medical professional and should be cleared with your attending health care practitioner before performing. Additionally, this is be no means all the information on the topic.
Anatomy
The lumbar spine consists of 5 stacked vertebrae (back bones) that sit on top of the sacrum (triangle shaped bone at the bottom of your spine that is attached to your tail bone). The sacrum then attaches to your innominates (bones that you touch when putting your hands on your hips) to create the sacroiliac joint. The reason I mention this area is that it is many time mistaken for lumbar spine pain and we will discuss the presentation of those
symptoms and how they differ from lumbar spine pain.
Given the number of muscles that attach to the lumbar spine it would take me forever to try to deal with them all so I am going to try to cover some of the more important ones. First, the two large bands of muscle that you can feel on the sides of your spine are known as the erector spinae. Their primary job is to extend (bend backwards) the spine. Despite their size, they are primarily only problematic because they spasm to protect the spine, but they are rarely the problem. Muscles that do typically cause problems are the multifidi, quadratus lumborum, and iliopsoas.
The multifidi are small muscles that cross 1-2 joints in the spine and assist with rotation and extension of the spine. These muscles run all the way up the spine and if problematic can result in rotations in the spine that cause pain and a variety of other problems. The quadratus lumborum (QL) is a muscle that attaches to the ribs and the top of the pelvic bone in the back. When both sides are contracted together they cause flexion (bending forward) of the lumbar spine, but individually will cause side bending of the spine. The iliopsoas is primarily a hip flexor (knee up), but since it attaches to the lumbar spine and the pelvis it can rotate one or both and is a very commonly missed muscular restriction.
Other important muscles are the abdominals. Now, I know that everyone wants the 6-pack, which is the rectus abdominis, but functionally it is only used for bracing and not stabilization of the lumbar spine. The more important muscles for lumbar spine stabilization are the obliques (internal and external) and the tranverse abdominis. These muscles together create stability in the lumbar spine and are critical for prevention and treatment of injury.
Now that we have talked about muscles, lets quickly cover how the joints and nerves work in the spine.
The spine is built with bones stacked on top of discs with small flat joints on the back on either side called facet joints. Between the discs and the facet joints exists a space called the intervertebral foramen for the nerves to exit from the spinal cord and travel down to the lower extremities. The intervertebral foramen is typically where nerve entrapment happens that results in the type of pain more people refer to as sciatica where the pain travels down the back of the leg.
Because there are multiple joint surfaces in the spine it leads to a variety of possibilities as far as problems that can develop. Each vertebrae is capable of rotating, side bending, shifting forward, backward, or sideways independently of the surrounding vertebrae. Unfortunately this is never the only problem. One thing that is sometimes ignored in the spine is that one joint affects all joints.
Your spine, skull, and pelvis make up what is known as your axial skeleton. One of the goals of the axial skeleton is to make sure your eyes are kept level and centered. The reason I mention this is that many problems in the spine are due to incorrect alignment that is the result typically of overuse and/or trauma. When injury occurs, a part of the spine comes out of alignment. The extreme example of this would be scoliosis.
For example, you are shoveling snow and just as you lift a heavy load you turn to throw it and experience pain in the lower back. Likely what happened is that one of the vertebrae rotated out of place. Over the next few days the pain subsides and life returns to normal. The problem is that the vertebrae didn’t rotate back. Your body adapted around it to make the rotated position the new normal position. Now, if this was the only thing that happened, your head and body would always be rotated in the direction of the rotated vertebrae, but we all know that is not the case. What happens instead is that the body will rotate another vertebrae above or below the injured segment to keep the eyes level and centered. I hope this explains the statement that I made before about how one segment affects all segments.
Common problems
Joint and Soft Tissue Inflammation - This one is probably the most common, particularly after car accidents, falls, and repetitive trauma like poor lifting mechanics or poor posture. Inflammation results in pain, swelling (decreases muscle contraction), redness, warmth, weakness, etc. Symptoms include tiredness in the low back toward the end of the day, mild to moderate pain, a feeling of weakness in the lumbar spine, pain with bending, lifting, and twisting, etc. This can be linked with some of the problems below, but can be more easily mitigated with rest, appropriate body mechanics, and corrective exercises that will be discussed below.
Herniated Disc – This is one that many people have heard about, but has incredible variation in how the problem presents. First, I want to preface this description with something about MRIs. If you performed and MRI on 100 people, almost 50% of them would present with some level of herniated disc in the lumbar spine, but have zero symptoms.
So, just because the MRI says that you have a herniated disc, does not mean that the disc is the cause for your problem. Herniated discs are caused when the hard outside of the disc is damaged and the soft inside pushes toward the damaged area. This then displaces the disc in the spine and can result in anything from localized pain, numbness, tingling, muscle weakness, sharp shooting pain into the leg(s), and much more. The reason for the neurological symptoms (numbness, tingling, shooting pain, etc.) is because of the close proximity of the disc with the nerves. Herniated discs frequently cause nerve compression that causes pain and other signals to travel along the path of the nerve down through the lower extremities. Typically the symptoms above are alleviated through extend positions of the lumbar spine such as standing, laying down with legs straight, and laying on the stomach. The extended positions compress the back side of the disc and shift the herniation forward away from the damaged area and nerves. Now, this is not always the case, but it is typically the most beneficial for individuals with herniated discs
Stenosis – This problem is more associated with individuals over the age of 50. The reason for the older population being affected by this is because of the progressive loss of disc height that decreases joint spaces in the spine. Decreased joint space leads to pain and inflammation. Most of the time this presents as stiffness and pain more so in standing or laying with your legs straight. Positions that alleviate pain are usually sitting or laying on your back with your knees bent because these positions will open up the facet joints to increase space and decrease joint pressure.
Sacroiliac Dysfunction – This problem tends to be misinterpreted as lumbar spine pain, but the problem is lower than the lumbar spine in most cases. What happens with this pathology is that rotation occurs with the sacrum or pelvis that changes the pelvic position and likely leg length. This change in leg length and rotated pelvis result in pain and an off center base of support for the rest of your body. If you stand with one knee bent and the other straight you can get a feel for what that might do to your back. The classic presentation for this is pain at or below the belt line and aggravated most with transitional movements (sitting to standing, laying to sitting, etc.) and changes in position, particularly sit to stand. Patients of mine have also stated that they feel like that have to sit on their hands to get comfortable. If you place your hands on your low back and feel for the two bony knobs that are approximately at your belt like. Just below those two bones on either side are your sacroiliac joints where you sacrum connects with your pelvis. If your pain is here, then likely the problem is coming from an misalignment of your pelvis and not from the lumbar spine. Of course there are exceptions to this and that can be determined by your primary care medical professional, but in general that is likely the cause for your pain.
Now onto the fun stuff!!!
Activities to avoid – Bending, lifting, twisting
Flexion with twisting and the addition of weight, especially when performed repetitively, is the most common cause for back injuries. What this combination movement does is take out 50-75% of the joint and muscular support of your spine and place it in a high risk position for injury. Also under the “bending” category is long duration sitting. Usually with prolonged sitting people tend to slump down in the the chair or hunch forward. Both of these positions will cause increased compression on the lumbar spine and sacroiliac joints. If this is the standard position of sitting everyday, it is a repetitive stress to the spine that will dramatically increase the likelihood for injury.
Body Mechanics
Sitting – If you click on the image to the right it will
enlarge in another window so that you can read the details of the work station set up. The same posture also applies for all other sitting activities, just without the computer
Lifting – I thought instead of describing the great details of a correct squat for lifting I would borrow a video lift from YouTube that you can view here on correct squat form. Yes, I know there are a ton of variations to the squat, but this one covers the basics.
Being aware of your body position is critical for avoiding lower back pain and injury. The more that you practice the correct body mechanics the more it will become part of your daily routine.
Exercises – Ok, I decided to go a little overboard (in case you hadn’t already noticed)
The exercises below are some of the basic exercises that can be performed to help treat and prevent low back pain. By creating core strength around the lumbar spine through the abdominals, pelvic muscles, and low back muscles you can reduce pain, and prevent injury. If any of the below listed exercises cause you pain or increase in pain, please do not perform them and consult your primary care medical professional.
Knee Rocks - easy exercise that can create decrease nerve firing to reduce pain and muscle spasm while gently working on the mobility of your lumbar spine
- Lay on your back with your knees bent and feet flat
- Gently rock your knees together side to side 5 degrees to the right and left
- Be sure to keep the motion equal to each side, if one side is more limited, make the other side equally as limited
- Repeat for 5 minutes
- Perform in the morning and evening or any other time when you experience pain
Pelvic Tilts – Strengthening of your transverse abdominis is critical for maintaining core stability. This exercise is given to all low back pain patients on their first day.
- Lay on your back with your knees bent and feet flat
- Gently draw your belly button to spine like zipping up a tight pair of jeans
- Try not to roll the hips back as this will activate the rectus abdominis, instead focus on drawing everything in like a corset
- Hold for 10 seconds
- Repeat 10x
- Repeat at least 5x/day
Bridges – strengthens the core (obliques and multifidi) as well as strengthening the gluteals for increased pelvic stability
- Lay on your back with your knees bent and feet flat
- Draw stomach toward your spine like zipping up a tight pair of jeans
- Squeeze your gluteals and lift your hips off of the table
- If you feel more strain in the low back or the back of the thighs then the gluteals are not being recruited properly. Stop, reset, and try again with more emphasis on the gluteals squeezing together to lift the body
- Hold the this position for 5 seconds
- Repeat 10x
- Repeat at least 3x/day
Standing Extension – the typical go to exercise for low back pain that benefits from extension
- Stand with feet shoulder width apart and hands on your hips
- Squeeze your gluteals together and hold
- Gently lean backwards extending your lower back, but not from the hips
- Slowly move back to the starting position
- Repeat 10x
- Repeat everytime you move from a sitting or laying position into standing.
Crossed Flexion – great exercise for stenosis to increase core strength and open the lumbar spine
- Lay on your back with your knees bent and feet flat
- Place the left hand against the right knee and press them together by tightening the abs in a diagonal pattern
- Hold for 10 seconds
- Then perform on the opposite side
- Repeat 10x on each side
- Repeat 5x/10 (most important in the morning and evening with knee rocks and pelvic tilts
Plank – one of the best core exercises (way better than sit ups or crunches)
- Lay on the floor face down
- Prop yourself up on your elbows/forearms with your toes into the floor
- Lift your pelvis off of the floor to make your body like a board
- There should be a straight line from your shoulder, through your hip, and to your ankle
- Keep the abdominals zipped in with gluteals squeezed
- Feel for the abdominal tremble
- Hold for 60 seconds (60 seconds is required to be able to test the true core muscles be fatiguing the larger compensating muscles)
- If this position is too hard, try it with your arms straight or on a stable elevated surface
I hope that you enjoyed this post and that you have gained more knowledge about the lumbar spine. If you have any questions or comments feel free to leave them here.
Cheers to your health,
Lynk
PS: If you are interested in a high quality injury guide that was put together by a fellow doctor of physical therapy check out http://drkbackinjuryguide.com.