Answer:
1. a. anterior cruciate ligament.
2. c. medial collateral ligament.
3. c. quadriceps.
4. d. hamstrings.
5. b. posterior cruciate ligament.
6. a. anterior cruciate ligament.
7. c. chondromalacia.
8. b. Osgood-Schlatter disorder.
9. c. Hoffa's syndrome.
10. b. rectus femoris.
11. b. pes anserine bursa.
12. c. genu varum.
13. b. False.
14. a. epiphyseal fracture.
15. c. jumping.
16. a. True
17. d. It has good blood supply and may be repaired.
18. d. a and c
19. d. a and b