Bone screw insertion. An increasingly common method of surgically stabilizing a broken bone is by inserting a screw into the bone with an automated surgical screwdriver. As the screw enters the bone, the medical team monitors the torque applied to the screw. The purpose is to drive the screw inward until the screw head meets the bone and then to rotate the screw a bit more to tighten the screw threads against the bone threads that the screw has cut along its path. The danger is to tighten the screw too much because then the screw threads destroy (strip) the bone threads. Figure 10.36 shows an idealized plot of torque magnitude r versus angle of rotation 0, all the way to the failure stage. Initially, as more of the screw enters the bone, the required torque increases until it reaches a short plateau at plateau = 0.10 Nm, which occurs as the head makes contact. Then the torque sharply increases as the screw tight- ens. The surgical team would like to stop at or near the peak at peak = 1.7 Nm and avoid passing into the failure region. They might be able to predict the peak from the plateau and the work done on the screw by the screwdriver. (a) What multiple of the plateau torque gives the peak torque? (b) How much work is done from the left end of the plot to the peak? T (N-m) peak plateau" 0 Tightening- Plateau- Insertion 750° 800° 1000⁰ Failure -0 (deg) 1200⁰

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Question:-

Wolff's law of bone 1.Give an example of good mechanical stress on bone 2. Think of a situation where there would be a lack of mechanical stress on bone?

Anatomy of a bone: Below explain what the five marked places are and describe the function. 5. Blood vessels Lymphatic vessel Nerve Compact bone 1. Lymphatic vessel Nerve 4. cavity

Help me label this bone please.

Types of Fractures Using the X-RAYS at each station, answer the following questions: 1. A 23-year-old male comes to the ER with a gunshot wound in the distal femoral region. The x-ray reveals the bone is shattered into multiple pieces. Pieces of lead can be seen in the x-ray. The ER doctor recommends the patient see orthopedic doctor for surgical repair. What type of fracture is this? 2. A 24-month-old pediatric patient comes into the clinic. Mom states that the child was running on the concrete at the park and fell with her arms outstretched. Her frontal region has a hematoma and there is swelling in the lower arm. X-rays reveal an oblique fracture. What bone is broken? 3. 7-year-old girl comes into the ER with an injury cause from a four-wheeler accident. The patient was a rider not the driver of the vehicle. Patients states that "brother slung her off" and she tried to catch herself with an outstretched arm. Mom states that patient's arm was hyperextended at the elbow joint.…

A. if someone (in the anatomical position) is hit in the knee by the front bumper of car coming from the left side of the person, which structure in the knee joint is the most likely to be torn? why? B. Sometimes in order to stimulate healing of the articular cartilage in the knee joint, a surgeon may have to induce bleeding by drilling a hole through the articular cartilage into the underlying bone. Explain why induced bleeding tends to help the healing process of the articular cartilage.