A Comparative Study of Electromyographic Activity of Quadriceps Muscle in Persons With Unilateral Transtibial Amputation Using Patellar Tendon Bearing Supracondylar Endoskeletal Prosthesis of the Age Group 18-60 Years With Unaffected Limb During Ascending and Descending Steps. IJCBR 2026, 11 (1), 61-68.