Early symptoms: Due to the slow development of knee osteoarthritis (OA), people sometimes have soreness or mild pain during activities; knee joint activity may occur when they are severely affected A feeling of flexibility and powerlessness.
Clinical symptom period: Common complaints from knee osteoarthritis (OA) patients are: knee pain, mostly bilateral, bilateral pain levels vary, and may appear alternately aggravated, more than clear The specific parts and properties can be radiated to the thighs and calves; the pain often occurs after long distance walking, and the walking distance is gradually shortened as the condition worsens. Patients can also have morning stiffness, rest pain and nighttime pain.
Physical symptoms: There may be no signs in the early stage of the disease; as the disease progresses, the knee joint pain may increase in short distance walking. Knee osteoarthritis (synovitis) floating sputum test (+) swelling deformity varies in severity, with varus deformity in the “O” leg, flexion deformity is the same size; the active knee has leather-like friction sound, rubble-like sound; drawer test + stress test (+); knee osteoarthritis (OA) complicated by acute synovial (cystic) inflammation: red, hot, swollen pain, significantly increased, at this time patients can consider the holy ancient chasing stickers External application with reasonable treatment.
Basic knowledge required for imaging examination:
Preferred conventional knee X-ray examination: general selection of positive lateral position, positive position X The film emphasizes (standing weight), and the reason for emphasizing the standing position is that when the affected knee joint is subjected to the weight load, the true variation of the joint space narrowness and the lower limb force line can be clearly observed. Such as taking a positive position in the lying position, affecting the judgment of the severity of the disease. Special Note: When shooting a positive position, the rotation and flexion of the lower extremities can affect the judgment of whether the lower limb force line is normal. When the knee joint is taken, it is convenient to observe the orbital position of the humerus in the femoral condyle, and it can accurately determine whether the humerus is displaced or displaced.
The imaging findings are the most important imaging examination of knee osteoarthritis (OA); the scope of the film should include the lower part of the femur and the upper part of the tibia. The performance of knee osteoarthritis (OA) on the orthotopic X-ray film is mainly due to the disappearance of the internal or external space of the knee joint or the widening of the stenosis, and the abnormality of the lower limb force line; the normal surface of the tibial plateau and the femoral condyle is brilliance, wear and tear. The roughened convex and concave are uneven, and the edge can be seen as “bone spur” (bone spur). Clinically, the medial gap is reduced and the lateral widening is varus deformity. Lateral X-ray can observe the stenosis of the patellofemoral joint space, the formation of the “bone spur” (bone sac) in the anterior and posterior tibial articular surface; the degree of degeneration of the cartilage surface of the tibia.
Conventional secondary position MRI examination importance:
Knee osteoarthritis (OA) MRI is not classified as a routine examination item: MRI examination T1, T2 signal knee joints The composition of the bone edge is lip-like hyperplasia, the degree of joint space is narrow; the biggest advantage of MRI examination is that it can detect even the early cartilage wear (the normal thickness of cartilage is 1mm), clearly show the brilliance of the cartilage articular surface, and can show the subchondral bone of the articular cartilage. The damage range T1, T2 signal can be obvious; the inner and outer meniscus front and back angles and the body with or without tear wear damage, even the horizontal tear damage MRI signal changes can be clearly diagnosed; anterior and posterior cruciate ligament injury breaks at a glance; the entire knee joint Is there any hypertrophic inflammation in the synovial fold? What is the amount of fluid and amount in the joint cavity diagnosed by MRI? This is an important inspection measure that cannot be replaced by X-ray or CT examination.