Glucosamine therapy for treating osteoarthritis

Area of Science:

• Rheumatology
• Pharmacology
• Clinical Trials

Background:

• Osteoarthritis (OA) is a prevalent degenerative joint disease causing disability and reduced quality of life.
• Current treatments for OA have limitations, necessitating exploration of alternative therapies.

Purpose of the Study:

• To systematically review randomized controlled trials (RCTs) assessing the efficacy and safety of glucosamine for OA treatment.
• To analyze pooled data on pain, function, and radiological progression in OA patients treated with glucosamine.

Main Methods:

• Comprehensive literature search of multiple databases (MEDLINE, EMBASE, etc.) updated to January 2005.
• Inclusion of RCTs (placebo-controlled and comparative) evaluating glucosamine's effectiveness and safety in OA.
• Quality assessment using Jadad scale and data synthesis via standardized mean differences (SMD) and relative risk ratios (RR).

Main Results:

• Pooled analysis of 20 RCTs indicated glucosamine favored placebo for pain (SMD -0.61) and Lequesne function (SMD -0.51), though not uniformly positive.
• Studies using the Rotta preparation showed significant improvement in pain (SMD -1.31) and Lequesne function (SMD -0.51) compared to placebo.
• No statistically significant benefits were observed for WOMAC pain, function, or stiffness outcomes across preparations.
• The Rotta preparation slowed radiological knee OA progression (SMD 0.24) over three years and was comparable to NSAIDs.
• Glucosamine demonstrated a safety profile similar to placebo (RR=0.97).

Conclusions:

• Glucosamine, particularly the Rotta preparation, may offer benefits for pain and function in symptomatic OA.
• Lack of consistent efficacy across different glucosamine preparations and outcome measures (WOMAC) warrants further investigation.
• Glucosamine is a safe treatment option for OA, comparable to placebo and NSAIDs in safety and radiological progression.