Logan Steele
The thigh is made up of several different muscle groups, including the hamstrings and quadriceps, which are particularly vulnerable to muscle strains. The gracilis muscle is a long, thin muscle that runs down the inner thigh and is one of five muscles that make up the adductors, which pull the legs together. The gracilis muscle is serviced by a branch of the obturator nerve and works with the hamstrings, sartorius, gastrocnemius, plantaris, and popliteus muscles to bend the knee.
| Characteristics | Values |
|---|---|
| Inner thigh muscles | Gracilis, Adductor longus, Adductor brevis, Adductor magnus, Sartorius, Hamstrings, Quadriceps |
| Gracilis muscle | Long, thin muscle that extends past the knee, helps pull the thighs together, rotate the hips and bend the knee |
| Adductor muscles | Pull the legs together |
| Hamstring muscles | Located on the back of the thigh, helps straighten and bend the leg |
| Quadriceps muscles | Located on the front of the thigh, helps straighten and bend the leg |
| Muscle strain | Common injury, particularly in sports, caused by tearing muscle fibres |
| Treatment for muscle strain | RICE protocol: Rest, Ice, Compression, Elevation; NSAIDs for pain relief; Physical therapy |
| Muscle imbalance | Stronger and weaker muscles working together can lead to strain |
| Muscle fatigue | Fatigue reduces energy absorption, making muscles prone to injury |
| Inner thigh exercises | Banded squats, banded side leg lifts, chair and ball exercises, pelvic floor exercises |
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What You'll Learn
The gracilis muscle
Groin strain or adductor tendinopathy commonly occurs in high-impact sports that involve ballistic movements or stretching, such as soccer, hockey, baseball, and basketball. Tearing of the muscles usually occurs at the proximal region near bony attachments at the pelvis. In women, the volume of the gracilis muscle is smaller than in men, predisposing females to ACL injury.
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Hamstrings
The hamstring muscle group is located along the back of the thigh, starting at the hip and ending just below the knee. The hamstrings are made up of three muscles: the biceps femoris, semitendinosus, and semimembranosus. These muscles work together with the quadriceps to straighten and bend the leg. They also play a critical role in many human activities, from walking and climbing stairs to more explosive actions like sprinting and jumping.
The hamstring muscles are skeletal muscles, meaning they are voluntary muscles that you can control. They contain thousands of long, elastic muscle fibres that help your leg muscles contract and tighten. These muscles cross two joints and have long proximal and distal tendons with long muscle tendon junctions (MTJs). The MTJs extend into the muscle bellies, overlapping within the muscle belly, and facilitate transmission and dissipate forces across the MTJ during muscle contraction and relaxation.
The biceps femoris is located on the outside of the back of the thigh. Its function is to flex the knee, extend the thigh at the hip, and rotate the lower leg from side to side when the knee is bent. The semimembranosus is on the innermost side of the back of the thigh. It also flexes the knee joint, extends the thigh at the hip, and rotates the hip and lower leg. The semitendinosus is located between the semimembranosus and biceps femoris and shares the same function.
Hamstring muscles are very susceptible to injury, especially among athletes who run and sprint. A common hamstring injury is called a "pulled hamstring" or strain, which can range from mild to severe. A pulled hamstring occurs when the muscle fibres overstretch but don't tear, resulting in mild muscle pain or swelling but with the leg still usable. A partial tear involves one or more hamstring muscles partially tearing, and pain and swelling may prevent the use of the leg. A complete tear is when the muscle tissue completely tears away from the tendon or bone.
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Quadriceps
The five muscles that make up the quadriceps are:
- Rectus femoris (RF)
- Vastus lateralis (VL)
- Vastus medialis (VM)
- Vastus intermedius (VI)
- Articularis genus muscle
The first four muscles listed above are considered the four parts or heads of the quadriceps. The fifth muscle, the articularis genus, is not often included, and a sixth muscle, the tensor vastus intermedius, has also been identified.
The quadriceps are crucial in walking, running, jumping, and squatting. They help to straighten the knee, allowing for kicking, running, and jumping. They also have important functions in the knee and hip joints, and are essential for daily activities such as climbing stairs or getting up from a chair.
The quadriceps are prone to injuries such as strains, contusions, and tendonitis, especially due to their involvement in high-speed, intense activities. To reduce the risk of injury, it is important to warm up and stretch before physical activity and to rest if you feel pain or fatigue.
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Adductors
The adductors' primary function is to provide lower-body stability and mobility during daily activities. They help with balance, align the legs and hips, and allow the legs and hips to rotate. Athletes depend on this muscle group for explosive movements such as running, jumping, and moving from side to side. The adductors serve as secondary supporting muscles during exercises such as squats, deadlifts, box jumps, and sled pushes.
By regularly training the adductors, individuals can improve athletic performance and prevent injury. Toning, strengthening, and stretching the adductors can help prepare them for the demands of physical exercise, reducing the risk of injury.
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Strains and injuries
The gracilis muscle is a long, thin muscle in each inner thigh that extends past the knee. It helps with hip adduction, or pulling the thighs together, and rotating the hips inward and outward. It also helps to stabilise the knee when bent. The gracilis muscle is prone to injuries, including groin strains, muscle spasms, and pinched nerves.
Groin strains are overstretching or tearing injuries to the muscles of the inner thigh or front of the hip. They are usually caused by overuse of the muscles or a sudden contraction, such as tightening. Groin strains can make activities like walking, lifting the knee, or moving the leg difficult and painful. They can occur during sprinting or any activity requiring forceful movement of the leg, such as jumping, kicking, or changing directions while running.
Thigh muscle strains are also common, particularly among athletes. They can happen when a muscle is stretched beyond its limit, tearing the muscle fibres. This often occurs near where the muscle joins the tendon. A thigh muscle strain can cause a snapping or popping sensation, sudden and severe pain, tenderness, bruising, swelling, and redness.
To treat a thigh muscle strain, most cases can use the RICE protocol:
- Rest: Take a break from activities that caused the strain.
- Ice: Apply cold packs for 20 minutes at a time, several times a day, without direct contact with the skin.
- Compression: Lightly wrap the area with a soft bandage to prevent additional swelling.
- Elevation: Elevate the leg above the level of the heart to minimise swelling.
For groin strains, surgery is rarely needed. Treatment focuses on reducing pain and improving muscle strength and leg motion through physical therapy.
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Frequently asked questions
The inner thigh is made up of several muscles, including the Adductor Magnus, Adductor Brevis, and Adductor Longus.
Inner thigh pain can be caused by a variety of factors, including muscle pull, tendinopathy, hernias, hip impingement, and osteoarthritis.
Treatment options for inner thigh pain include rest, ice therapy, compression, elevation, heat therapy, pain relievers, and physical therapy. Staying active and maintaining a healthy weight can also help manage the pain.
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