Classificazione dell'osteoartrite: scala Kellgren-Lawrence spiegata

KL Grade 0: Normal

Grade 0 represents a radiographically normal articolazione with no features of osteoartrite. The articolazione space is preserved and symmetric, the osso surfaces are smooth without osteophytes (osso spurs), and there is no sclerosis (whitening) or cyst formation in the subchondral osso. A Grade 0 radiografia does not rule out early cartilagine changes, as RM is far more sensitive for detecting cartilagine softening and early degeneration that is not yet visible on radiografia.

KL Grade 1: Doubtful

Grade 1 shows doubtful narrowing of the articolazione space with possible osteophyte formation. The findings are subtle and there is debate among radiologists about whether they represent true early osteoartrite or normal anatomic variation. On radiografia, you may see tiny osso spurs at the articolazione margin, particularly at the tibial spines in the ginocchio or at the acetabular margin in the anca. articolazione space width is essentially normal. Many people with KL Grade 1 findings have no sintomo. trattamento is focused on prevention: maintaining healthy body weight, regular low-impact esercizio, and avoiding articolazione overloading.

KL Grade 2: Mild

Grade 2 represents definite early osteoartrite with clear osteophyte formation and possible articolazione space narrowing. On radiografia, osteophytes are clearly visible at the articolazione margins, and there may be slight reduction in articolazione space width compared to normal. Some paziente develop mild sclerosis of the subchondral osso. This is the stage where most paziente first notice sintomo — intermittent dolore with activity, morning stiffness lasting less than 30 minutes, and occasional gonfiore after exertion.

KL Grade 3: Moderate

Grade 3 represents moderate osteoartrite with definite articolazione space narrowing, moderate osteophyte formation, some subchondral sclerosis, and possible bony deformity. On radiografia, the articolazione space is noticeably reduced (but not obliterated), osteophytes are moderate in size, and the subchondral osso appears denser and whiter than normal. Small subchondral cysts may be visible.

paziente with KL Grade 3 typically experience more consistent dolore, particularly with weight-bearing activities, prolonged walking, and stair climbing. Morning stiffness may last longer, and the articolazione may feel unstable or catch. trattamento options expand to include intra-articular injections (corticosteroids or hyaluronic acid), bracing, and more structured physical therapy programs. articolazione replacement is not yet typically recommended at this stage, but may be discussed if sintomo are significantly impacting quality of life.

KL Grade 4: Severe

Grade 4 represents severe osteoartrite with significant articolazione space narrowing (often osso-on-osso), large osteophytes, marked subchondral sclerosis, and definite bony deformity. On radiografia, the articolazione space may be completely obliterated in one or more compartments, meaning the bones are in direct contact. Large osteophytes distort the normal articolazione contour, and the subchondral osso is dense and white. Angular deformity (varus or valgus in the ginocchio) may be present.

KL Grade 4 typically corresponds with significant daily dolore, limited walking distance, difficulty with stairs, and reduced quality of life. At this stage, articolazione replacement (total ginocchio or anca replacement) is the most effective trattamento option, with 90-95% paziente satisfaction rates and implant survival exceeding 15-20 years. conservativo measures may still help manage sintomo while waiting for or deciding about chirurgia.

Key Takeaways

• KL Grade 0: normal articolazione; Grade 1: doubtful changes; Grade 2: definite early OA; Grade 3: moderate OA; Grade 4: severe OA
• Le caratteristiche radiografiche chiave valutate sono osteofiti, restringimento dello spazio articolare, sclerosi subcondrale e deformità ossea
• I reperti radiografici non sempre correlano con la gravità dei sintomi
• Il Grado KL 2 è un punto d'intervento importante in cui i cambiamenti nello stile di vita possono rallentare la progressione
• La sostituzione articolare è più efficace per il Grado KL 4 con tassi di soddisfazione del 90-95%
• La RM fornisce una valutazione più dettagliata di cartilagine, menischi e midollo osseo rispetto alla radiografia

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