Introduction
The act of bending the knee to a right angle, often referred to as 'knee bending', is a basic movement that is essential for everyday activities. Normal knee range of motion typically allows for about 135 degrees of flexion, which is the angle at which the knee is fully bent. When the knee is bent at less than 90 degrees, it is considered a 'knee bend' and is limited in its ability to bend further. While the ability to bend the knee to 90 degrees is generally not a problem, it can become a concern if it is consistently limiting activities or preventing full ROM.
Causes
Injury
Injuries to the anterior Cruciate Ligament (ACL) are a common cause of knee bending limitations. ACL tears can occur during sports activities or accidents. Additionally, chronic knee bending limitations can occur due to the wearing down of a meniscus or other cartilaginous structures within the joint that provide additional support and cushioning.
Arthritis
Arthritis is another common cause of knee bending limitations. Arthritis is a chronic inflammatory disease characterized by the oxidation and damage ofjoint cartilages. This process eventually causes thebones to fuse together, leading to severe limitations in movement. Arthritis of the knee joint is often diagnosed in middle age and older adults.
Mechanical Issues
Other mechanical factors can also contribute to knee bending limitations. These include poor alignment, tight muscles, limited ROM, or bony alignment issues that can impede movement. For example, a lack of hip or踝 strength and poor coordination can lead to improper load transfer, resulting in overstraining the knee joint.
Symptoms
Activity Limitations
Symptoms of restricted knee bending often include the inability to perform activities that require deeper knee bends, such as running, jumping, or climbing stairs. This can also manifest as an inability to fully extend the knee to achieve an optimal position.
Pains and Swelling
Pain and swelling in the knee are common symptoms associated with knee bending limitations. The discomfort can range from minor aches to intense, sharp pain. Swelling and water retention inside the knee joint can cause the knee to feel臃ish and warm to the touch.
Stiffness and Locking
Stiffness and locking of the knee are additional symptoms that can arise due to restricted knee bending. These symptoms can make it difficult or impossible to move the knee smoothly and independently.
Diagnosis
Diagnosis of knee bending limitations may involve a physical examination, which focuses on evaluating the range of motion and feeling for any restrictions. Imaging tests, such as x-rays or MRIs, may also be ordered to determine the underlying cause of the limitation.
Treatment
Treatment for knee bending limitations depends on the underlying cause. Options range from non-surgical treatments like physical therapy and medication to surgical interventions such as knee arthroscopy or knee replacement if non-surgical approaches are not successful. The goal of treatment is to restore normal function, flexibility, and ROM to the affected joint.
Recovery
Recovery from knee bending limitations can take significant time and effort, often requiring persistent effort and dedication. Non-surgical interventions may include physical therapy, exercises, and lifestyle changes to strengthen the muscles around the joint and improve mobility.
##Knee bending to 90 degrees is generally not a serious issue in and of itself unless it is impacting everyday activities or preventing normal movements. However, if knee bending limitations are present, it is important to consult with a healthcare provider to determine the underlying cause and develop an appropriate treatment plan. By addressing the root cause of the limitation, patients can often regain full movement and return to their desired level of function.
