Hamstring muscles from the posterior femoral region:
(1) biceps femoris
(2) semitendinosus
(3) semimembranosus
Patients at risk for an inadequate hamstring tendon graft have a:
(1) body mass index < 18 kg per sq m
(2) weight less than 50 kilograms
(3) height less than 140 cm
(4) thigh circumference less than 37 cm
Patients at risk for having hamstring tendon biopsies that are too small for grafting:
(1) older, short female with small thigh circumference (small graft diameter)
(2) shorter patient with short legs (insufficient graft length)
(3) young, skinny men with small thigh circumference (small graft diameters)
Thigh circumference is measured 15 cm proximal to the medial joint line of the knee.
Leg length is measured from the anterior superior iliac spine to the medial malleolus.
Thigh length is measured from the anterior superior iliac spine to the medial joint line of the knee.
predicted diameter of the quadrupled STG (semitendinosus-gracilis) graft in cm =
= (0.025 * (weight in kg)) + 5.7
= (0.86 * (ipsilateral thigh circumference in cm)) + 3.7
= (0.95 * (body mass index)) + 5.17
= (0.024 * (height in cm)) + 3.6
where:
• The equations ofr ipsilateral thigh circumference and BMI give values that differ from the other equations. If 0.086 and 0.095 are used then comparable results are returned.
predicted diameter of the quadrupled STG graft in males in cm =
= (0.03 * (body weight in kg)) + 5.4
= (0.01 * (BMI)) + 5.18
predicted diameter of the quadrupled STG graft in females in cm =
= (0.06 * (ipsilateral thigh circumference in cm)) + 4.48
predicted gracilis graft length in cm =
= (1.9 * (height in cm)) - 37.5
= (2.4 * (leg length in cm)) + 62.5
predicted semitendinosus graft length in cm =
= (2.09 * (height in cm)) - 55.3
= (3.06 * (leg length in cm)) + 23.3
predicted semitendinonosus graft length in females =
= (3.7 * (thigh length in cm)) + 96.4
= (1.81 * (height in cm)) - 14.9
