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Rthopae Ic Monthly THE UNIVERSITY OF TOLEDO MEDICAL CENTER APPROVED FOR AMA PRA CATEGORY 1 CREDIT; SEE INSERT FOR DETAILS OF TOLEDO MEDICAL CENTER THE UNIVERSITYRTHOPAE IC MONTHLY VOLUME 11, ISSUEf 6 JUNE < BY NABIL A EBRAHEIM MD Hamstring Injuries The hamstrings are a group of muscles located on the back of the thigh. The muscles of the hamstrings are the biceps femoris (long and short head), semitendinosus, and semimembranosus. The proximal end of the hamstring muscle originates from the ischial tuberosity of the pelvis. The semitendinosus and the long head of the biceps femoris share a commonorigin from the ischial tuberosity in HAMSTRINGS The semimembranosus has its own separate this medial location. (three muscles) origin which is lateral on the ischium. The hamstringsorigin on the ischial tuberosity is approximately 6cm proximal to the inferior border of the gluteus maximus. The gluteus maximus muscle is BICEPS FEMORIS proximally. All muscles of the covering the hamstring tendon (long & short head) hamstrings are innervated by the tibial (medial part) of the sciatic nerve except for the short head of the biceps which is innervated by SEMITENDINOSUS the commonperoneal nerve. The short head of the biceps femoris is innervated by the commonperoneal nerve. The hamstring muscles SEMIMEMBRANOSUS are a major flexor ofthe knee, and they also aid in hip extension. The hamstring muscles are inserted on the proximal part of the leg. The biceps femoris splits from the semitendinosus and moveslaterally to function of the hamstring muscles. Risk factors include previous take a lateral direction and be inserted into the posterior aspectofthe hamstring injury that may cause healing by a weak scar that is fibular head. The biceps femoris is the most posterior structure susceptible to anotherinjury, tighter hamstrings in the shorter leg in inserted into the fibular head and posterior to the biceps femoris leg length discrepancy, decreased hip extension, severe imbalance tendon lies the commonperoneal nerve. Another muscle appears to between the quadriceps and hamstring strength, or inadequate help the long headofthe biceps femoris laterally, and this is the short warmup. With hip flexion and knee extension, there is an eccentric head of the biceps femoris muscles. The short head of the biceps forceful contraction and lengthening of the muscle which causes femoris does not originate from the ischium, but it has a common injury to that tendon. Hamstring strains are classified into three insertion with the long head of the biceps femoris. The grades: minor tear within the muscle, partial tear wichin the muscle, semimembranosus and semitendinosus are inserted into the or complete tear of the muscle or the tendon. Most hamstring proximal part of the medial tibial condyle. There is a balance injuries in adults will occur at the musculocutaneous junction, but between the hamstring muscles on the lateral aspect and on the injury may also occur at the insertion into the ischial tuberosity. medial aspect. Proximally, the sciatic nerve is very close to the Avulsion injuries can also occur where there is a severe hamstring hamstring muscles, and it is about 1.2cm lateral to the hamstring injury, and the tendon tears away with a fragment of bone. These muscles. The hamstring muscles cover the sciatic nerve. Thesciatic avulsion fracture injuries are not commonandare typically seen in nerve lies anterior to the hamstring muscles in the proximal and patients who are younger and skeletally immature athletes. After a middle third of the thigh. Injury to the hamstring muscles primarily sprain or partial tear, the satellite cells respond to the injury and is occur proximally and are a common source of chronic pain and responsible to make new muscle. On clinical examination, the injury in athletes. Hamstringinjury is often referred to as a hurdler’s patientwill complain of sharp pain in the backof the thigh, popping injury. Athletes who attemptto clear hurdlesare proneto injury due or tearing of the muscle, ecchymosis of the posterior thigh, and a to excessive hamstringtension. Injury to the hamstrings musclesalso palpable mass in the middle of the thigh. may occur in running athletes and in soccer/football players due to Continued on page 2 sudden hip flexion and knee extension which is opposite to the Hamstring Injuries continued This injury is usually diagnosed by an MRI. A sprained or pulled with the knee flexed. Use anchors in the ischium to repair the hamstring can occur due to insufficient warm up time before tendon to the ischial tuberosity. In case of bony avulsion, screws may activity. Conservative treatment includes rest, ice, compression be used in selected cases to fix the bony fragment to the ischium. bandage, elevation, protected weight-bearing for four weeks, and Post-operatively, the patient will be partial weight-bearing for about physical therapy. Surgery is done when there is a complete injury of six weeks with the knee flexed to forty degrees. By six months, 80% the tendon with muscle retraction. Thesurgeryis usually done carly, of the patients return to the preinjury level of activity, function and make theincision, find the retracted muscle/tendon, and protectthe sports. Avoid a situation wherethere is a severely retracted tear with nerve. The patientwill be prone, and the tendonis approached by a scarring of the muscle, and the muscleis scarred to thesciatic nerve. transverse incision over the gluteal crease. The tendon is repaired Clinical Evaluation of the Hamstring Muscles The hamstring muscles predominantly flex the knee and assist in laterally on the fibula. The semitendinosus has a commonorigin extension of the hips. To examine the hamstring function, put the with the biceps femoris muscle, then it is separated from the biceps patient prone so that the hips and the lower extremities can hang femoris as it descends medially, and as the long head of the biceps freely from the edgeofthe table (dangle). Assess if the patientis able femoris descendslaterally. The semimembranosushasits own origin to flex the knees and if the patient can do that against gravity and from the ischial tuberosity. It goes medially to be inserted on the against resistance. Palpate on the medial side to see if there is proximal tibia medially, next to the insertion of the semitendinosus contractionor activity of the semimembranosus and semitendinosus. muscle, All hamstring muscles are supplied by the tibial division of Palpatelaterally to see if there is any activity of the biceps femoris the sciatic nerve except the short head of the biceps femoris muscle muscle. There are three hamstring muscles: biceps femoris (long and which is supplied by the common peroneal division of the sciatic short head), semitendinosus, and semimembranosus. The long head nerve. Hamstring muscle function could be affected and should be of the biceps femoris muscle arises from the ischium and is inserted assessed if there is an injury to the hamstring muscle/tendon itself into the fibular head. The short head of the biceps femoris arises (such as injury to the hamstring origin) or if the sciatic nerve is from the femur and is inserted with the long head of the biceps affected (tibial or commonperoneal division). Calcaneal Avulsion Fractures The calcaneusis the largest of the tarsal bones. An avulsion fracture of the calcaneus can occurat the point ofinsertion of the Achilles Calcaneal Avulsion Fractures tendon. Injury is usually due to sudden dorsiflexion of the gastrocnemius and soleus muscles which pulls the Achilles tendon upwardcausing an avulsion fracture of the calcaneus. In addition to aiel—a forced dorsiflexion of the ankle which causes this fracture; other causes of avulsion fracture of the calcaneus are fall, blunt trauma, sprinting, diabetes, and osteoporosis (more common amongelderly females). There are three types of published avulsion fractures of the calcaneus: type I, type II, and type III. Type I is the “sleeve” type tuberosity fracture. TypeII is the “beak” type avulsionfracture. Type III is rare; it is an infrabursal avulsion fracture. The fragment may cause skin complication and an open wound with exposed bone. In type I, the fragment is usually displaced and rotated which compresses the skin at the back of the heel. This pressure will create skin necrosis and significant soft tissue complication. The skin is general, most calcaneal fractures are closed injuries that can be usually very bruised because of the pressure of the bone on the skin. treated nonoperatively and when surgery is necessary, the surgery is In type II, the piece of boneis bigger than in Type fracture. This delayed until the soft tissue condition improves. On theother hand, fracture usually causes skin complication, and the fragment may avulsion fractures of the calcaneus are rare and are different. They cause skin necrosis and an open wound with exposed bone unless require urgent care for reduction and fixation of the avulsed there is an urgent treatment for this condition. In type III, a very fragment. This will eliminate the risk of skin complication and small piece of the calcaneus is attached to the Achilles tendon. In restore the function of the Achilles tendon. I Lesions of the Sciatic Nerve & Its Branches The sciatic nerveis the largest nerve in the body. Thesciatic nerve starts from the nerve roots in the lower back, and these nerve roots LUMBOSACRAL join each other to form thesciatic nerve. The sciatic nerve arises CreUSLe TO SCIATIC N. from L4, L5, $1, $2, and $3. The sciatic nerve has two main HIP. PIRIFORMIS DISLOCATION components: common peroneal nerve and tibial nerve. The sciatic SYNDROME CAUSE INJURY nerve runs through the buttock and the lower limb. Thelevel of the TO SCIATIC N. INJURY TO SCIATIC N. division of thesciatic nerve is variable, but it usually occurs at the DUE TO ACETABULAR middle or the lowerthird of the thigh. In about 10% of patients,the SCREW PLACMENT division of thesciatic nerve can occurat the greater sciatic foramen.
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