NRP/531 Week 6: Musculoskeletal and Neurological Examination Note, sample paper

Numb Fingers at the Deboning Line: A Focused Neurological and Musculoskeletal Hand Examination for Carpal Tunnel Syndrome in a 38-Year-Old Poultry Worker, With the Classic Tests Weighed Against the Useful Ones

[Student Name]

University of Phoenix

NRP/531: Advanced Health Assessment I

Week 6 Assignment

[Instructor Name]

[Date]

The patient is a composite written for a model paper.

Subjective

Mr. H., a 38-year-old poultry processing worker, reports four months of numbness and pins-and-needles affecting the first three digits of his right hand, worse at night, often waking him, relieved by shaking the hand. He has dropped small objects at work. His job involves repetitive gripping and wrist flexion on a deboning line for eight hours a day in a cold environment. No neck pain, arm weakness above the hand or symptoms in the left hand. He has no diabetes or thyroid disease that he knows of. Medications: ibuprofen as needed. No allergies.

Objective

Inspection: no swelling or deformity. Mild flattening of the right thenar eminence compared with the left. No interosseous wasting.

Sensation: pinprick dulled on the palmar side of the first three digits and the radial half of the fourth on the right; normal over the little finger and dorsal hand. Two-point discrimination 7 mm at the right index fingertip, 4 mm on the left. Sensation of the thenar eminence palm itself normal.

Strength: right thumb abduction against resistance 4 out of 5, left 5 out of 5. Grip, finger abduction and wrist extension normal.

Reflexes: biceps, brachioradialis and triceps 2+ and symmetric.

Provocative tests: Phalen's test reproduces tingling in the right index and middle fingers at 40 seconds; Tinel's sign at the right wrist positive. Spurling's test negative bilaterally.

Neck: full range of motion without pain.

Katz hand diagram: classic pattern.

Assessment

Right carpal tunnel syndrome, probable, with sensory loss and early motor involvement. Cervical radiculopathy and ulnar neuropathy unlikely.

Plan

Nerve conduction studies and electromyography. Night wrist splint in neutral position. Discuss job modification and ergonomic changes with his employer, with permission. Screen for diabetes and hypothyroidism with A1C and thyroid-stimulating hormone. Follow up after testing; early surgical referral if weakness progresses.

The most familiar tests were the weakest evidence in the note; the pin and the thumb told more.

Which Findings Carry Weight

D'Arcy and McGee (2000) reviewed the accuracy of history and examination findings for carpal tunnel syndrome, using nerve conduction studies as the reference. The most useful findings for establishing the diagnosis were hypalgesia in the median nerve territory, with a likelihood ratio of 3.1, a classic or probable Katz hand diagram, 2.4, and weak thumb abduction, 1.8. An unlikely Katz diagram, 0.2, and normal thumb abduction strength, 0.5, argued against the diagnosis. Several traditional findings, including Tinel's and Phalen's signs, had little or no diagnostic value.

Mr. H. has the three most useful positive findings, which together make the diagnosis likely. His positive Phalen's and Tinel's signs add little.

Clinical Criteria

Graham et al. (2006) developed and validated six clinical diagnostic criteria for carpal tunnel syndrome: numbness mainly in the median nerve territory, nocturnal numbness, thenar weakness or atrophy, a positive Phalen's test, loss of two-point discrimination and a positive Tinel's sign. Mr. H. meets all six, which places him at a high probability of carpal tunnel syndrome.

Why the Distribution Matters

The median nerve supplies sensation to the palmar thumb, index, middle and radial ring finger. The palmar cutaneous branch, which supplies the skin of the thenar palm, leaves the nerve before the carpal tunnel, so sensation there is spared in carpal tunnel syndrome but not in a more proximal median nerve lesion. Mr. H.'s normal thenar palm sensation supports compression at the wrist.

Separating Other Causes

Cervical radiculopathy at C6 or C7 can cause similar finger symptoms but usually with neck pain, reflex changes and a positive Spurling's test; Mr. H. has none. Ulnar neuropathy affects the little and ring fingers; his are normal. Peripheral neuropathy from diabetes would usually be bilateral and in a stocking-glove pattern.

Why Thenar Weakness Changes Urgency

Thenar flattening and weak thumb abduction indicate motor axon involvement, a sign of more advanced compression. Padua et al. (2016) note that severity guides management: mild cases often respond to splinting and activity changes, while those with muscle weakness or atrophy are more likely to need surgical decompression to prevent permanent loss.

Occupational Factors

Repetitive, forceful gripping, wrist flexion and cold exposure, all features of Mr. H.'s job, are associated with carpal tunnel syndrome. His employer may be able to rotate tasks and provide tools that reduce wrist flexion. The note records his job in detail because it affects both cause and workers' compensation.

How the Examination Was Performed

Sensation was tested with a disposable pin and a two-point caliper, comparing each digit with the same digit on the other hand, with Mr. H.'s eyes closed. Thumb abduction was tested by asking him to raise the thumb perpendicular to the palm against my resistance, isolating the abductor pollicis brevis, which the median nerve supplies after it passes through the carpal tunnel. Phalen's test was performed with the wrists held in full flexion for 60 seconds, and Tinel's sign by tapping over the median nerve at the wrist crease. The Katz hand diagram was completed by Mr. H. before the examination, so that his drawing was not influenced by my questions.

The Role of Nerve Conduction Studies

Nerve conduction studies confirm the diagnosis, grade severity and exclude other causes, such as a more proximal median nerve lesion or a generalized neuropathy. D'Arcy and McGee (2000) note that using these studies as the reference standard has its own limits, since some patients with typical symptoms have normal studies. For Mr. H., testing will also establish a baseline before any treatment and support a workers' compensation claim if he pursues one.

Treatment Options by Severity

Padua et al. (2016) describe a stepwise approach. Mild cases are managed with night splinting, activity modification and sometimes a corticosteroid injection. Moderate to severe cases, particularly with weakness or atrophy, are considered for surgical release, which relieves pressure on the nerve by dividing the transverse carpal ligament. Mr. H.'s thenar weakness places him toward the severe end, so the conversation about surgery should begin early.

Returning to Work

Until testing is complete, I recommended that Mr. H. wear the splint at night, take short breaks every hour to rest and stretch his hands and keep his hands warm with lined gloves on the line. I wrote a note for his employer, with his consent, asking for temporary task rotation.

Documentation Notes

The note records sensory findings by digit and surface, two-point discrimination in millimeters and strength graded out of 5, so changes can be tracked after treatment.

Conclusion

Mr. H.'s median nerve sensory loss, classic hand diagram and weak thumb abduction, the findings with the greatest diagnostic value, make carpal tunnel syndrome likely, and he meets all six clinical criteria. Traditional provocative signs add little. Thenar weakness signals motor involvement, so nerve conduction studies and early attention to his job and possible surgical referral are warranted.

References

D'Arcy, C. A., & McGee, S. (2000). Does this patient have carpal tunnel syndrome? JAMA, 283(23), 3110-3117. https://doi.org/10.1001/jama.283.23.3110

Graham, B., Regehr, G., Naglie, G., & Wright, J. G. (2006). Development and validation of diagnostic criteria for carpal tunnel syndrome. The Journal of Hand Surgery, 31(6), 919.e1-919.e7. https://doi.org/10.1016/j.jhsa.2006.03.005

Padua, L., Coraci, D., Erra, C., Pazzaglia, C., Paolasso, I., Loreti, C., Caliandro, P., & Hobson-Webb, L. D. (2016). Carpal tunnel syndrome: Clinical features, diagnosis, and management. The Lancet Neurology, 15(12), 1273-1284. https://doi.org/10.1016/S1474-4422(16)30231-9