Cartilage Quality (dGEMRIC Index) Following Knee Joint Distraction or High Tibial Osteotomy

Area of Science:

• Orthopedics
• Radiology
• Biomedical Engineering

Background:

• High tibial osteotomy (HTO) and knee joint distraction (KJD) are established treatments for knee osteoarthritis (OA).
• These procedures aim to unload the affected joint, potentially delaying the need for total knee arthroplasty (TKA).
• Limited data exists on the quality of regenerated cartilage following HTO and KJD.

Purpose of the Study:

• To evaluate the change in quality of repaired cartilaginous tissue after KJD and HTO.
• To compare cartilage quality changes between KJD and HTO treatments for medial tibiofemoral OA.
• To correlate cartilage quality changes with clinical outcomes.

Main Methods:

• A study involving 40 patients (20 KJD, 20 HTO) with medial tibiofemoral OA.
• Radiographic outcomes, clinical characteristics, and cartilage quality assessed via dGEMRIC at baseline, 1, and 2 years.
• Delayed gadolinium-enhanced magnetic resonance imaging of cartilage (dGEMRIC) used to measure cartilage quality.

Main Results:

• Both KJD and HTO showed significant increases in joint space width (JSW) at 2 years.
• No statistically significant average change in dGEMRIC indices (cartilage quality) was observed over 2 years for either treatment.
• A positive correlation was noted between improved cartilage quality and patients' perceived clinical benefit.

Conclusions:

• HTO and KJD provide clinical benefits and increase cartilage thickness in knee OA patients.
• Average cartilage quality, assessed by dGEMRIC, remained similar to baseline post-treatment.
• Individual variations in cartilage quality changes correlated with clinical improvements, suggesting personalized treatment responses.