OBJECTIVES: We evaluated functional results of patients who underwent surgical treatment for supracondylar femoral fractures. METHODS: Functional results of surgical treatment for supracondylar femoral fractures were evaluated in 23 patients (14 males, 9 females; mean age 34 years; range 14 to 64 years) with the use of the Neer and HSS (The Hospital for Special Surgery) scoring systems. The strength of the quadriceps muscle was measured using Cybex isokinetic testing. The mean follow-up was 52 months (range 13 to 160 months). RESULTS: The average HSS score was 93.8 (range 68 to 100) and the average Neer score was 90.1 (range 55 to 100). The average losses of extension strength at 60 degrees /s and 180 degrees /s were 27.30% and 22.13%, respectively. Statistically significant correlations were found between the losses of extension strength and the Neer and HSS scores (p<0.01). The results showed that the patient's age and sex, the length of time between trauma occurrence and surgery, immobilization period, and the presence of subjective pain complaints had no significant influence on the HSS and Neer scores and on Cybex isokinetic test results (p>0.05). CONCLUSION: Evaluation of the quadriceps muscle strength with the use of objective tests proved helpful in the determination of functional results of surgery following supracondylar femoral fractures.