Tibia Bone

A i.e. Posterior cruicate ligament

Ans. 20% of height

• Common peroneal nerve is related to neck of fibula (not tibia).
• Nutrient artery of tibia is a branch of posterior tibial artery.
• Nutrient artery of fibula is a branch of peroneal artery.
• Tibia is the commonest site of osteomyelitis.

Ans. is ‘b’ i.e., Posterior cruciate ligament

Posterior cruciate ligament

• PCL begins from posterior part of intercondylar area of tibia and runs upwards, forwards and medially to attach the anterior part of the lateral surface of medial condyle of femur.
• PCL is extrasynovial but intracapsular, i.e., lies between synovium and capsule of the knee joint.
• It provides antero-posterior stability and prevents posterior gliding of tibia on femur.
• It is taut in flexion.
• Blood supply of cruciate (anterior & posterior) ligaments is from : –

1. Middle genicular artery (major supply)
2. Inferior genicular (medial & lateral) artery (less important).

• Nerve supply of cruciate ligaments (ACL & PCL) is from posterior articular branch of tibial nerve.

Ans. is ‘c’ i.e., Inversion of foot

Ans. is ‘b’ i.e., Tillaux fracture

Tillaux fractures

• Fracture occurring in older adolescents.
• Mechanism of injury is an external rotational force with stress placed on the anterior tibio – fibular ligament, causing avulsion of the distal tibial physisanterolaterally.
• It occurs after the medial part of the physis has closed but before the lateral part closes.
• It is either Salter-Harris type III or IV fracture.

Ans. a. Coronary

Ans. is ‘c’ i.e., Strain of valgus knee with axial loading

Tibial Plateau fractures

• Mechanism of injury: Fractures of the tibial plateau are caused by ^yams or valgus force combined with axial loading.
• Eg: car striking a pedestrian (so called bumper fracture).
• It is more often seen in cases of fall from height in which the knee is forced into varus or valgus.
• Classification: Schatzker classification for the proximal tibia fractures.

Ans. is ‘b’  i.e., 20% of height

• Stature is determined in dismembered body (skeletal remains) by :

1. Length from the tip of middle finger to the tip of opposite middle finger when arms are fully extended.
2. Twice the length of one arm + 30 cm (of two clavicles) + 4 cm (for the sternum).
3. Humerus length is 1/5^th of height.
4. The length from the vertex to the symphysis pubis is half of the total length.
5. The length from the sternal notch to Symphysis pubis x 3-3.
6. The length of forearm measured from tip of middle finger is =5/19 of total length.
7. The height of head measured by the vertical distance from the top of the head (vertex) to the tip of chin = 1/8 of the total length.
8. The length of vertebral column = 34/100 of total length. To the length of entire skeleton, add 2^.5 to 4 cm for thickness of the soft parts.
9. As a general rule humerus is 20%, tibia is 22%, femur is 27% and spine is 35% of individual height.