Ultrasonographic evaluation of the femoral cartilage thickness after unilateral arthroscopic partial meniscectomy.

PURPOSE: To assess the distal femoral cartilage after unilateral arthroscopic partial meniscectomy and to explore the relationship between cartilage thickness and various disease-/surgery-related parameters. METHODS: Eighty-nine patients (42 M, 47 F) who had undergone arthroscopic partial meniscectomy surgery were evaluated. Ultrasonographic distal femoral cartilage thicknesses were measured with a 5-13-MHz linear probe (General Electric, Logiq P5) on mid-points of the lateral condyle, intercondylar notch and medial condyle of operated and non-operated knees by a physician blinded to patients' data. Demographic features, duration after surgery, type of meniscal tear and site of meniscectomy were recorded. RESULTS: Mean age of the patients was 51.8 ± 12.8 years (range 18-88). Mean body mass index was 29.4 ± 4.4 kg/m2 (range 18-38). Overall, in patients with degenerative meniscal tears, femoral cartilage thicknesses pertaining to all the three measured sites (lateral, intercondylar and medial) were found to be decreased in the operated knees when compared with those of the non-operated knees (p = 0.004, p = 0.003, p = 0.041, respectively), whereas in patients with non-degenerative tears, this decrease was significant only in the intercondylar area (p = 0.038). When patients were grouped according to the duration (months) after their surgery (≤36, 37-48 and ≥49), cartilage thickness was similar between both knees in the first group, decreased at the lateral condyle (p = 0.008) and intercondylar area (p = 0.049) in the second group and decreased at all three sites (lateral, intercondylar and medial) in the third group (p = 0.015, p = 0.005 and p = 0.008, respectively). CONCLUSION: These findings would be considered as unfavourable with respect to weight-bearing, and thus, conservative measures to support relevant joints would strongly be kept in mind during clinical practice. Lastly, ultrasonography may be a convenient alternative imaging method for the evaluation of short- and medium-term cartilage loss in patients with arthroscopic partial meniscectomy. LEVELS OF EVIDENCE: III.