A 16-year-old patient who is six months post wrist fracture is in for a follow up visit. The nurse assesses the range of motion (ROM) of the affected arm and notes which bones are involved in pronation and supination of the forearm?
Phalanges and clavicle
Metacarpal and carpal
Humerus and scapula
Radius and ulna
The Correct Answer is D
A. Phalanges and clavicle: The phalanges are the distal bones of the digits involved in grasping, while the clavicle anchors the upper limb to the axial skeleton. Neither bone participates in the rotational mechanics of the forearm. Their anatomical positions are too distal and proximal, respectively, to influence radioulnar rotation.
B. Metacarpal and carpal: These bones form the structural framework of the hand and the wrist joint proper. While they move as a unit during forearm rotation, they do not provide the pivot mechanism required for pronation or supination. Their primary movements include flexion, extension, and radial or ulnar deviation.
C. Humerus and scapula: These bones constitute the glenohumeral joint, which allows for circumduction and rotation of the entire upper extremity. While the humerus provides the proximal origin for some forearm muscles, it does not rotate during isolated forearm supination. The scapula serves as a stable base for shoulder mobility.
D. Radius and ulna: The proximal and distal radioulnar joints allow the radius to rotate around the relatively stationary ulna. This specialized articulation enables the palm to turn upward (supination) or downward (pronation). Functional integrity of these two bones is essential for common activities of daily living following a fracture.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is C
Explanation
A. Bathe the newborn with hypoallergenic soap twice daily to reduce the rash: Frequent bathing can disrupt the delicate acid mantle of the neonatal skin and cause irritation. Erythema toxicum is an idiopathic inflammatory response that does not respond to topical cleansing agents. Over-washing may exacerbate skin dryness without resolving the eosinophilic papules.
B. Apply a thin layer of antibiotic ointment to prevent secondary infection: This rash is a sterile condition characterized by eosinophilic infiltration rather than bacterial colonization. The use of prophylactic antibiotics is clinically unnecessary and may contribute to antimicrobial resistance. Topical ointments can also block pores and cause further cutaneous irritation.
C. Educate the parents that the condition is benign and requires no treatment: Erythema toxicum neonatorum is a self-limiting, non-pathological eruption common in healthy full-term infants. It typically resolves spontaneously within 7 to 14 days without any medical intervention. Reassurance is the primary nursing responsibility to alleviate parental anxiety.
D. Isolate the newborn to prevent spread to other infants: This condition is not infectious or transmissible, as it is an internal physiological reaction. Isolation protocols are reserved for contagious pathogens and would unnecessarily separate the infant from the mother. The rash does not pose a risk to the nursery population.
E. Give antifungal treatments to the newborn: The lesions of erythema toxicum are not fungal in origin and will not respond to antimycotic medications. Administering unnecessary drugs to a neonate carries risks of systemic side effects and toxicity. Proper diagnosis relies on recognizing the typical migratory pattern of the rash.
Correct Answer is C
Explanation
A. Stage IV: This stage involves full-thickness skin and tissue loss with exposed fascia, muscle, tendon, ligament, or bone. The case description specifies only partial-thickness loss involving the epidermis and dermis. There is no mention of deep tissue exposure in Marcus.
B. Stage I: A stage I pressure injury is characterized by non-blanchable erythema of intact skin. The assessment of Marcus identifies a shallow open area, which indicates a break in skin integrity. Therefore, the injury has progressed beyond the initial stage of redness.
C. Stage II: This stage is defined by partial-thickness loss of the dermis, presenting as a shallow open ulcer with a red-pink wound bed. The absence of slough or bruising is consistent with this classification. Marcus's assessment findings perfectly align with these specific criteria.
D. Stage III: Stage III involves full-thickness skin loss where adipose tissue is visible in the ulcer. The description of Marcus's wound as a shallow open area confirms it has not penetrated the subcutaneous layer. It remains restricted to the upper cutaneous layers.
E. Deep Tissue Pressure Injury (DTPI): This injury presents as a localized area of persistent non-blanchable deep red, maroon, or purple discoloration. Marcus's wound bed is described as pink and open, which contradicts the intact, dark discoloration seen in DTPI. The mechanics of his injury are superficial.
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