The Most Important Muscle You’ve Never Heard Of…Part 3 – The Adductor Group

The Adductor Group 1

The adductor group, or more commonly known as the “groin”, is located on the inside of the upper thigh and consists of 5 muscles: pectineus, adductor longus, adductor brevis, adductor magnus, and gracilis. The main function of this group of muscles is to bring your leg closer to the midline of your body or cross one leg in front of the other. If that isn’t cutting it for you, think “Thigh Master”! The Thigh Master works the adductor group and helps tone the medial (inside) thigh.

These five muscles originate on the pubic bone and insert on the femur (thigh bone). These points of connection dictate the movements these muscles perform. Shortening of these muscles, or concentric contraction, bring the femur closer to the pubic bone thus creating the movement of adduction.

The Adductor Group 2

The most common injury to this group is a muscle strain, also known as a groin pull. Symptoms of a groin pull include stabbing pain in the groin area that may or may not radiate down the inside of the thigh, swelling and/or bruising, muscle spasms, and the inability to adduct the leg. There are three different grades of muscle strain in the groin.

The Adductor Group 3

Grade 1: Minor tearing of muscle fibers with mild discomfort and mild to no pain while walking.

Grade 2: Moderate (more than 50%) tearing of muscle fibers with swelling, bruising and moderate to severe pain with difficulty walking.

Grade 3: Almost complete to complete rupture of the muscle fibers and tendon with severe pain and inability to walk.

While the belly of the muscle can be injured, the musculotendinous junction between the belly and the tendon is thought to be the most commonly injured area of the muscle. This can cause problems with healing because that area of the muscle has less blood supply than the belly so it does not get the nutrients needed to properly heal.

The Adductor Group 4

How does one injure their groin? There are several different mechanisms of injury for a groin pull including sprinting, quickly changing directions, overstretching the muscle, jumping or landing after a jump, running uphill and rapid movements against resistance (kicking a ball). Sports such as ice hockey, soccer, football, basketball, rugby, martial arts, gymnastics, dance, and track and field tend to have higher incidence of groin injuries. In fact, about 2.5% of all karate injuries are groin related and between 10-18% of all soccer injuries are to the groin. There are also factors that can increase the risk of an athlete pulling their groin. Those include not warming up properly, preexisting weakness in the adductor group, previous injury to the area, tightness in the adductor group, biomechanical factors and lower back problems.

The Adductor Group 5The Adductor Group 6

Treatment of a groin injury can be tricky depending on the area of the muscle that is affected. Injuries to the muscle belly, for example, are best managed with light stretching, a protocol of strengthening exercises and pretty quick return to activities. Injuries to the musculotendinous junction, however, require a more conservative approach to treatment, including rest until the athlete is pain free, mild stretching and strengthening over several weeks, working their way up to running and sprinting then finally running and sprinting with quick directional changes.

The Adductor Group 7

In the acute stage of injury (1-3 days), cold therapy such as ice can help relieve pain and swelling, as well as decrease bleeding within the muscle that causes bruising. Rest is also recommended during this time. It is important for the athlete to seek professional treatment following a groin injury to help guide them through their recovery. Chiropractors, especially those who specialize in sports medicine…like most of us at Pro Chiropractic…have many different tools to aid in recovery. Modalities used at Pro Chiropractic to promote healing include:

~ Electrical muscle stimulation to help relax and potentially rebuild injured muscles

~ Therapeutic ultrasound provides deep heat into the tissue to relieve pain

~ Soft tissue mobilization techniques (i.e. Graston Technique, fascial manipulation, myofascial release, etc.) can help guide the healing muscle fibers to lie in the proper orientation to avoid scar tissue formation and trigger points

~ Kinesiology tape to decompress the injured tissue and promote blood flow to the area which aids in healing by bringing the proper nutrients to the injured muscle

~ Therapeutic exercises and stretches to actively involve the athlete in their recovery away from the office