![]() ![]() EP EVALUATOR 8 CRACK FULLThe muscles in the lower legs must work together to allow full flexion and extension of the knee. If muscle imbalance occurs the system can break down. It requires synchronized movements between muscles, tendons, and ligaments. Causes of kneecap dislocations include trauma, weak muscles, and the female gender. This occurs most frequently in the 10- to 17-year age group. The annual incidence of primary patellar dislocation is 5.8 per 100 000 in the general population (6). If the knee cap becomes dislocated from this boney groove it can cause patients to complain that they can’t straighten the knee. The groove is called the trochlear groove. The kneecap is intended to slide smoothly up and down the boney groove in the thigh bone. Bone spurs can cause a physical block to full knee extension. If large enough they can prevent the knee from straightening. Bone spurs develop as a result of trauma, instability, and arthritis. Osteoarthritis/Bone SpurĪ bone spur is the growth of additional bone along the edges of a joint. If severe, the swelling can cause the inability to straighten the knee. This swelling can significantly reduce knee movement. Symptoms may vary from patient to patient. There are numerous signs and symptoms of an ACL tear. ACL tears account for 64% of athletic knee injuries in pivoting sports resulting in 120,000- 200,000 ACL reconstructions annually in the United States (5). Tears in the ACL can occur as a result of trauma, and rapid pivoting and cutting movements. The ligament extends from the thigh bone (femur) to the shin bone (tibia) and limits forward and rotational movement of the knee. The anterior cruciate ligament ( ACL) is a key stabilizer of the knee. Injury to the patellar tendon can cause patients to complain that they can not straighten their knees. Injuries occur in athletes who participate in jumping and running sports. It is important in stabilizing the knee cap and knee extension. The patella tendon is a thick piece of connective tissue that connects the kneecap (patella) to the shin bone. It can also prevent you from straightening your knee. Quadriceps tendon injuries typically produce anterior knee pain (4). Common causes of injury include age over 40 years, steroid use, chronic and repetitive knee injections (3). The quadriceps muscle is susceptible to injury. Tendons are thick pieces of connective tissue that connect the muscle to bone. The quadriceps function as a powerful extensor of the knee. It is actually composed of 4 different muscles which include the rectus femoris, vastis medius, lateralis, and intermedius. The quadriceps muscle is a powerful muscle located in the front of the thigh. Injury to the meniscus can cause a number of symptoms which include: Risk factors for meniscus tears include advanced age, male gender, work-related kneeling, and climbing stairs (2). Examples include horizontal, vertical, complex, and flap tears. There are many different types of meniscus tears that are classified (1). Meniscus tears are among the most common knee injuries. The meniscus functions as a shock absorber and joint stabilizer and is susceptible to injury. One on the inside (medial) and one on the outside (lateral) of the knee. The meniscus is a C-shaped cushion situated between the thigh bone and shin bone. The major causes of inability to straighten the knee include. ![]() There are multiple factors involved in the movement of the knee. What Are the Major Causes of Why I Can’t Straighten the Knee?īeing unable to straighten your knee can be frightening. The inability to straighten the knee is also known as an extension lag and is a reason for concern. When lying flat on an examination table or hard surface your knee should be able to extend so that there is no angle between the thigh and shin bone. PT, trainers, and physicians alike measure the degree of knee flexion and extension. The extension is the opposite of flexion. Knee extension is when you straighten out your knee. Flexion is when you bend your knee and the shin bone moves towards the buttock. The most common are flexion and extension. Your knee is capable of moving in a number of directions. What Does It Mean When your Knee Won’t Straighten? Should you be alarmed? What does it mean when your knee won’t straighten? What are the 8 major causes of why you can’t straighten the knee? When should you be concerned about not being able to straighten the knee? What are the treatment options? Let’s dig in. You got up from your chair and can’t straighten your knee. ![]()
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