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Finger Pulley Anatomy: Understanding Your Fingers’ Structure

Finger pulley injuries are unique digital injuries distinct from sprains or dislocations. They occur specifically in rock climbers and occasionally in baseball pitchers. What are the symptoms, diagnoses, and treatments available?

Finger Pulley Injury

A finger pulley injury, common in activities like climbing, involves damage to the fibrous bands (pulleys) that hold tendons against bones. This causes pain, swelling, and potentially bowstringing of the tendons.

  • Finger pulleys are structures that hold tendons against the bones of the fingers.
  • Injury symptoms include pain, swelling, and a popping sound heard at the time of the injury.
  • Finger pulley injuries, or ruptures of the digital pulley, are seen almost exclusively in rock climbers. (Miro P. H. et al., 2021)

This activity stresses the digits when maneuvering along uneven surfaces while supporting the entire body’s weight. The injuries result from the mechanics of the finger tendons and joints and the position the fingers hold while rock climbing. Rock climbing has grown in popularity. The only other sport in which this injury has been described is baseball, in pitchers. The forces acting on the finger are very different in these activities, but both place high stress on the finger pulleys.

Digital Pulleys

Everyone has structures in their fingers called digital pulleys. These pulleys hold the tendons against the bones of the fingers. Each finger has eight pulleys, but only two are considered critical to prevent the finger tendons’ bowstringing (when one pulley gives out or ruptures). This can result in various injury outcomes, from a simple strain of the pulley to ruptures of multiple pulleys in a single digit. Pain, stiffness, and an inability to fully flex the finger can occur. (Carruthers K. H., Skie M., & Jain M. 2016) In severe situations, when the tendons are bowstringing, the tendon may lift away from the finger when making a fist.

Symptoms

Pain and Tenderness

  • Localized pain and tenderness at the finger’s base, particularly when gripping or bending. Pain on the palm side of finger and tenderness with pressure

Swelling

  • Swelling and bruising around the affected finger joint, especially on the palm side.

Popping Sound

Stiffness and Difficulty Bending

  • Stiffness and pain when bending the fingers or difficulty gripping. Difficulty forming a fist

Bowstringing

  • Visible displacement of the tendon from its normal position, causing a bulge at the finger’s base.

Most commonly, the middle or index digit is the injured finger. The two critical pulleys in the finger are designated the A2 and A4. (Carruthers K. H., Skie M., & Jain M. 2016) Individuals may see swelling, redness, and inflammation at the base of the finger (A2) and/or in the space between the two finger joints closest to the tip of the finger (A4). In rock climbers, either or both of those pulleys may be injured. In baseball pitchers, the injury is typically isolated to the A4 pulley.

Causes

  • Overuse and Repetitive Strain: Frequent or intense gripping or crimping, common in rock climbing and other activities, can cause pulley injuries.
  • Dynamic or Sudden Movements: Desperate or dynamic moves or poor technique can lead to injury.
  • Excessive Force: Pulleys can rupture when the force exerted on them is too great.
  • Mechanism of injury: The A2 pulley is the most commonly injured, followed by the A4 pulley.

Diagnosis

Emergency treatment is generally unnecessary. However, it is important to have suspected digital pulley injuries examined by a specialist within several days to a week after the injury. The most important aspect of an evaluation is determining whether the injury has caused the bowstringing of the tendons. Imaging tests may be performed to help with the diagnosis and plan treatment. An ultrasound is recommended as the initial imaging technique. (Miro P. H. et al., 2021)

If an ultrasound is inconclusive, an MRI may be advised. Sometimes, an MRI is performed with the finger held straight and then bent to see if the tendons are bowstringing. An X-ray can also help exclude other causes of finger pain, including sprains and fractures.

Treatment

Conservative Care

  • Immobilization, physical therapy, and pulley-protective measures, such as splints or taped fingers, are often used.

Surgery

  • Surgery may be necessary for severe grade IV injuries where conservative care fails.
  • Only in situations where there are multiple pulley ruptures or if there is delayed treatment should surgery be necessary.

Rehabilitation

  • Focuses on regaining flexibility, strength, and grip function through exercises and physical therapy.

If the tendons do not bowstring, treatment usually protects the injured finger until swelling and pain subside. If there is bowstringing of the tendons, more careful management of the injury is needed. Individuals who suspect a pulley injury rest or splint the finger and use nonsteroidal anti-inflammatory drugs as necessary for pain until they can get a medical evaluation. (Carruthers K. H., Skie M., & Jain M. 2016) Physical therapy is recommended for most injuries, along with immobilization, the H-tape method, and a protective pulley splint. (Miro P. H. et al., 2021) Specialized splints and therapy techniques can allow the pulleys to heal properly.

Returning to activity varies significantly with the severity of the injury. With mild pulley strains, full activity can be resumed as soon as swelling and pain have subsided. Treatment for full ruptures being treated non-surgically is typically between one and three months. For individuals requiring surgical reconstruction of a pulley injury, restrictions may apply up to a year after the surgery.

Injury Medical Chiropractic & Functional Medicine Clinic

To prevent complications, a healthcare provider should evaluate pulley injuries as soon as possible. Treatment most often consists of physical therapy, but surgery may be necessary. Injury Medical Chiropractic and Functional Medicine Clinic works with primary healthcare providers and specialists to develop an optimal health and wellness solution. We focus on what works for you to relieve pain, restore function, and prevent injury. Regarding musculoskeletal pain, specialists like chiropractors, acupuncturists, and massage therapists can help mitigate the pain through spinal adjustments that help the body realign itself. They can also work with other medical professionals to integrate a treatment plan to resolve musculoskeletal issues.


Sports Injury Treatments


References

Miro, P. H., vanSonnenberg, E., Sabb, D. M., & Schöffl, V. (2021). Finger Flexor Pulley Injuries in Rock Climbers. Wilderness & environmental medicine, 32(2), 247–258. https://doi.org/10.1016/j.wem.2021.01.011

Carruthers, K. H., Skie, M., & Jain, M. (2016). Jam Injuries of the Finger: Diagnosis and Management of Injuries to the Interphalangeal Joints Across Multiple Sports and Levels of Experience. Sports Health, 8(5), 469–478. https://doi.org/10.1177/1941738116658643

A Comprehensive Guide to Facet Arthropathy

Can individuals managing facet arthropathy treat the condition with over-the-counter pain relievers, prescription muscle relaxers, exercise, and chiropractic spinal manipulation?

Facet Arthropathy

Blog Image  Facet Joint Arthritis

Facet arthropathy, or facet osteoarthritis, is arthritis that affects the facet joints in the spine. It causes pain and stiffness due to cartilage degeneration within these joints, often resulting from wear and tear associated with aging. Essentially, it occurs when the small joints in the back of the spine become arthritic and rub against each other painfully.

  • It affects the bony protrusions, called facet joints, that connect the spine’s bones.
  • Symptoms include neck and back pain that can worsen with standing, bending, or twisting.
  • Facet arthropathy is diagnosed using X-rays and other imaging studies.
  • Severe cases may require surgery.

Facet Joints

Twenty-four vertebrae form the spine, with two facet joints between each. Facet joints are small joints located at the back of each vertebra in the spine. They allow movement and stability, help maintain the alignment of the spinal bones/vertebrae, and limit excessive motion. The joints and the cushioning intervertebral disc form a three-joint complex between each vertebra.

  • The three-joint complex allows the spine to move, including bending, rotating, and extending.
  • Synovial fluid lubricates the joints so they can move.
  • The intervertebral disc provides flexibility and dissipates compressive loads.
  • The facet joints stabilize the spine by constraining rotation and bending.

Symptoms

Arthropathy refers to any disease affecting a joint, including arthritis. Osteoarthritis, also known as arthrosis, is a specific type of arthropathy. It is a non-inflammatory, degenerative arthritis. Pain is the main symptom that is typically worse in the morning when awakening, and in the evening, the pain can also get worse when twisting or bending backward. The symptoms can vary based on the part of the affected spine. Low back pain is the most common, a condition referred to as lumbar facet arthropathy because it affects the lumbar spine of the lower back. (Perolat R. et al., 2018) Common Symptoms include:

  • Muscle spasms or cramps.
  • Pain that may come in periodic flare-ups
  • Pain that worsens with standing or inactivity.
  • Dull pain on both sides of the spine.
  • Aching pain on both sides of the spine.
  • Pain in the lower back, buttocks, shoulders, or back of the skull
  • Radiating pain to the buttocks and legs.
  • Pain that improves with sitting, leaning forward, or changing positions.
  • Pins-and-needles sensations in the hands or feet.
  • Clicking sounds when moving the spine.
  • Catching sensations when moving the spine.
  • Muscle weakness.

Causes

Facet arthropathy causes progressive damage to the spine. Spinal osteoarthritis, aka spondylosis, is the most common cause, but it can also occur with a severe form of spinal arthritis known as ankylosing spondylitis. It is primarily due to age-related wear and tear, but injuries or repetitive stress on the spine can also cause it. Arthritis in the facet joints can develop due to:

  • Aging-related wear and tear
  • Disc problems
  • A previous back injury
  • Torn ligaments
  • Spinal fractures

Deterioration of facet joints can also cause bony overgrowths called osteophytes or bone spurs, which can cause radiating pain and restrict the spine’s range of motion.

Degeneration

  • The facet joints and intervertebral discs degenerate due to age-related wear and tear.
  • The cartilage in the facet joints can dry out, crack, and wear down.
  • The joint capsule and synovial membrane can inflame or tear, affecting synovial fluid production.
  • The loss of cartilage can lead to hypermobility, and the joint can stiffen over time.

Diagnosis

Imaging studies are important to the diagnosis. Several types confirm the diagnosis and also characterize the nature and severity of the condition:

  • X-rays provide a plain, black-and-white image of the spinal column.
  • CT scan composites multiple X-rays to create a three-dimensional image of the spinal column.
  • MRI uses magnetic and radio waves to generate images of soft tissues like ligaments and cartilage.

To confirm the diagnosis, a diagnostic block, which is a small amount of local anesthetic, is injected into a facet joint. The needle placement is directed either with an ultrasound or a CT scan. Facet arthroplasty is confirmed if the injection provides immediate relief (American Academy of Orthopaedic Surgeons, 2022). The healthcare provider will want to exclude other possible causes as part of the differential diagnosis. Conditions that mimic facet arthropathy include:

  • Herniated disc
  • Psoriatic arthritis
  • Reactive arthritis
  • Spinal gout
  • Spinal compression fracture

Treatment

The treatment varies based on its location and severity. Generally, conservative treatments are used before more invasive procedures are considered.

Lifestyle Changes

  • Initially, a healthcare provider may recommend rest and avoiding aggravating movements, including any activity that involves bending or twisting.
  • Activities that take the weight off the facet joint, such as sitting, leaning forward, or changing positions, may help ease the pain.
  • Patients may also be advised to adjust their sleep positions to take the pressure off facet joints.
  • Options included curling up on your side or lying on your back with the knees supported with pillows.

Medications

If a diagnostic block is used, a patient may not need medications immediately. However, as the anesthetic starts to wear off, the patient may be prescribed over-the-counter or prescription pain relievers based on the severity of the pain. These can include:

  • Analgesics like Tylenol
  • Nonsteroidal anti-inflammatory drugs like Advil or Aleve
  • Muscle relaxants like Lloresal for acute back pain
  • Antidepressants like Cymbalta for chronic back pain

Physical Therapy

Physical therapy is a major part of the treatment of lower back pain. The treatment plan will include personalized exercises to strengthen the core muscles and avoid stress on the spine. Examples include:

  • Mechanical traction and non-surgical to decompress the spine.
  • Knee-to-chest stretches, hugging your knees for 30 to 60 seconds.
  • Walking 10 to 20 minutes per day.
  • Aquatic therapy to alleviate pressure on the spine.

Surgery

If conservative measures don’t work or provide sufficient relief, a healthcare provider may recommend specialist procedures or surgeries that include:

  • Lumbar intra-articular injections deliver an anesthetic or corticosteroid into the spine for longer-lasting pain relief.
  • Sinuvertebral nerve ablation destroys spinal nerves with a strong electrical current.
  • Extracorporeal shockwave therapy ESWT delivers low- or high-energy electrical pulses to help ease pain.
  • Spinal fusion surgery involves fusing two or more vertebrae to eliminate movement and pain in the facet joints.
  • Facet rhizotomy is a surgical procedure used to sever one of the nerves supplying the facet joint.
  • Stem cell regeneration is an experimental procedure in which stem cells are harvested and injected into damaged joints to restore function.

Injury Medical Chiropractic and Functional Medicine Clinic

Injury Medical Chiropractic and Functional Medicine Clinic works with primary healthcare providers and specialists to build optimal health and wellness solutions. We focus on what works for you to relieve pain, restore function, prevent injury, and help mitigate issues through adjustments that help the body realign itself. They can also work with other medical professionals to integrate a treatment plan to resolve musculoskeletal problems.


Facet Syndrome Pain Treatment


References

Perolat, R., Kastler, A., Nicot, B., Pellat, J. M., Tahon, F., Attye, A., Heck, O., Boubagra, K., Grand, S., & Krainik, A. (2018). Facet joint syndrome: from diagnosis to interventional management. Insights into imaging, 9(5), 773–789. https://doi.org/10.1007/s13244-018-0638-x

American Academy of Orthopaedic Surgeons. (2022). Spinal injections. https://orthoinfo.aaos.org/en/treatment/spinal-injections/

Exploring Nociceptors: Detecting and Reacting to Pain

Can understanding how nociceptors function and their role in processing pain signals help individuals who are managing injuries and/or living with chronic pain conditions?

Nociceptors

Nociceptors are nerve endings that detect harmful stimuli, such as extreme temperatures, pressure, and chemicals, and signal pain. They are the body’s first defense against potentially damaging environmental inputs.

  • Nociceptors are in the skin, muscles, joints, bones, internal organs, deep tissues, and cornea.
  • They detect harmful stimuli and convert them into electrical signals.
  • These signals are sent to the brain’s higher centers.
  • The brain interprets the signals as pain, which prompts the body to avoid the harmful stimulus.

Nociceptors, often called pain receptors, are free nerve endings all over the body. They play a pivotal role in how the body feels and reacts to pain. The main purpose of a nociceptor is to respond to damage to the body by transmitting signals to the spinal cord and brain. (Purves D, Augustine GJ, Fitzpatrick D, et al., editors. 2001) If you bang your foot, the nociceptors on the skin are activated, sending a signal to the brain via the peripheral nerves to the spinal cord. Pain resulting from any cause is transmitted this way. Pain signals are complex, carrying information about the stimuli’s location and intensity. This causes the brain to fully process the pain and send communication back to block further pain signals.

Classification

There are different classes of nociceptors, which are based on which type of stimuli they respond to (University of Texas McGovern Medical School, 2020)

Thermal

  • Thermal nociceptors respond to extreme hot or cold temperatures.
  • For instance, when touching a hot stove, the nociceptors, which signal pain, are activated immediately, sometimes before you know what you’ve done.

Mechanical

  • Mechanical nociceptors respond to intense stretching or strain, such as pulling a hamstring or straining a tendon.
  • The muscles or tendons are stretched beyond their ability, stimulating nociceptors and sending pain signals to the brain.

Chemical

  • Chemical nociceptors respond to chemicals released from tissue damage.
  • For example, prostaglandins and substance P or external chemicals like topical capsaicin pain creams.

Silent

  • Silent nociceptors must be first activated by tissue inflammation before responding to a mechanical, thermal, or chemical stimulus.
  • Most visceral nociceptors are located on organs in the body.

Polymodal

  • Polymodal nociceptors respond to mechanical, thermal, and chemical stimuli.

Mechano-thermal

  • Mechano-thermal nociceptors respond to mechanical and thermal stimuli.

Pain Transmission

Nociceptors are also classified by how fast they transmit pain signals. Transmission speed is determined by the type of nerve fiber known as an axon a nociceptor has. There are two main types.

  • The first type is A fiber axon, fibers surrounded by a fatty, protective sheath called myelin.
  • Myelin allows nerve signals/action potentials to travel rapidly.
  • The second type is C fiber axons, which are not surrounded by myelin and transmit slower. (University of Texas McGovern Medical School, 2020)

Because of the difference in transmission speed, the pain signals from the A fibers reach the spinal cord first. As a result, after an acute injury, an individual experiences pain in two phases, one from the A fibers and one from the C fibers. (Ngassapa D. N. 1996)

Pain Perception Phases

When an injury occurs, the stimulated nociceptors activate the A fibers, causing a person to experience sharp, prickling pain.

  1. This is the first phase of pain, known as fast pain, because it is not especially intense but comes right after the stimulus.
  2. During the second phase of pain, the C fibers are activated, causing an intense, burning pain that persists even after the stimulus has stopped.
  3. The fact that the C fibers carry burning pain explains why there is a short delay before feeling the sensation.
  4. The C fibers also carry aching, sore pain caused by organs within the body, such as a sore muscle or stomachache. (Ngassapa D. N. 1996)

Injury Medical Chiropractic and Functional Medicine Clinic

Injury Medical Chiropractic and Functional Medicine Clinic works with primary healthcare providers and specialists to build optimal health and wellness solutions. We focus on what works for you to relieve pain, restore function, prevent injury, and help mitigate issues through adjustments that help the body realign itself. They can also work with other medical professionals to integrate a treatment plan to resolve musculoskeletal problems.


From Injury To Recovery With Chiropractic Care


References

Purves D, A. G., Fitzpatrick D, et al., editors. (2001). Nociceptors. In Neuroscience. 2nd edition. (2nd ed.). Sunderland (MA): Sinauer Associates. https://www.ncbi.nlm.nih.gov/books/NBK10965/

University of Texas McGovern Medical School. (2020). Chapter 6: Pain Principles. https://nba.uth.tmc.edu/neuroscience/m/s2/chapter06.html

Ngassapa D. N. (1996). Comparison of functional characteristics of intradental A- and C-nerve fibres in dental pain. East African medical journal, 73(3), 207–209.