La. Admin. Code tit. 40 § I-2321

Current through Register Vol. 50, No. 9, September 20, 2024

Section I-2321 - Follow-Up Diagnostic Imaging and Testing Procedures

A. One diagnostic imaging procedure may provide the same or distinctive information as does another procedure. Therefore, the prudent choice of a single diagnostic procedure, a complement of procedures or a sequence of procedures will optimize diagnostic accuracy; maximize cost effectiveness (by avoiding redundancy), and minimize potential adverse effects to patients.

B. All diagnostic imaging procedures have a significant percentage of specificity and sensitivity for various diagnoses. None is specifically characteristic of a certain diagnosis. Clinical information obtained by history taking and physical examination should form the basis for selecting an imaging procedure and interpreting its results.

C. When a diagnostic procedure, in conjunction with clinical information, can provide sufficient information to establish an accurate diagnosis, the second diagnostic procedure will become a redundant procedure. At the same time, a subsequent diagnostic procedure can be a complementary diagnostic procedure if the first or preceding procedures, in conjunction with clinical information, cannot provide an accurate diagnosis. Usually, preference of a procedure over others depends upon availability, a patient's tolerance, and/or the treating practitioner's familiarity with the procedure.

1. Imaging Studies are generally accepted, well-established and widely used diagnostic procedures. When indicated, the following additional imaging studies can be utilized for further evaluation of the shoulder, based upon the mechanism of injury, symptoms, and patient history. For specific clinical indications, refer to Specific Diagnosis, Testing and Treatment Procedures. The studies below are listed by frequency of use, not importance. Diagnostic imaging may be useful in resolving the diagnostic uncertainties that remain after the clinical examination. Even a thorough history and physical examination may not define the shoulder pathology that produces the patient's symptoms. Therefore, additional investigations should be considered as an accepted part of the patient evaluation when surgery is being considered or clarification of diagnosis is necessary to formulate a treatment plan.

a. X-ray is widely accepted and frequently the first imaging study performed. Three radiographically distinguishable acromion types have been described: Type I (flat), Type II (curved), and Type III (hooked). Historically, acromion type was correlated with incidence of rotator cuff pathologies and with outcome of nonsurgical treatment of shoulder pain. However, there is considerable variation between observers regarding the acromial types, both in interpreting plain x-rays and in classifying anatomical specimens. Acromial morphology should not be used to assess the likelihood of rotator cuff pathology. Acromial morphology alone should not be considered an indication for acromioplasty, as up to 40 percent of asymptomatic adults may have a Type II acromion. Appropriate soft tissue imaging techniques such as sonography and MRI should be used to assess rotator cuff or bursa status.

b. Diagnostic Sonography is an accepted technique for suspected full-thickness tears. A positive sonogram has a high specificity of 96 percent and provides convincing confirmation of the diagnosis. Sensitivity is high, 87 percent, however, negative sonography does not rule out a full-thickness tear. For partial thickness tears, a positive sonogram has high specificity, 94 percent, but is only moderately sensitive, 67 percent. A negative sonogram does not exclude the diagnosis of a partial thickness tear. The performance of sonography is operator-dependent, and is best when done by a specialist in musculoskeletal radiology. It is preferable to MRI when the patient is claustrophobic or has inserted medical devices.

c. Magnetic Resonance Imaging (MRI) is generally accepted and widely used to provide a more definitive visualization of soft tissue structures, including ligaments, tendons, joint capsule, and joint cartilage structures, than x-ray or Computed Axial Tomography (CT) in the evaluation of traumatic or degenerative injuries. The addition of intravenous or intra-articular contrast can enhance definition of selected pathologies. In general, the high field, conventional, MRI provides better resolution than a low field scan. A lower field scan may be indicated when a patient cannot fit into a high field scanner or is too claustrophobic despite sedation. Inadequate resolution on the first scan may require a second MRI using a different technique. All questions in this regard should be discussed with the MRI center and/or radiologist. MRI provides excellent soft tissue detail, but interpretation of the image is problematic and depends on operator skill. A positive MRI has high specificity of 93 percent and provides supporting evidence that a clinical suspicion of a full-thickness tear is correct. Sensitivity of MRI for full-thickness tears is also high at 89 percent. However, it may not identify the pathology in some cases. For partial thickness tears, sensitivity of MRI is below 50 percent but its specificity is high at 90 percent.

d. Computed Axial Tomography (CT): is generally accepted and provides excellent visualization of bone and is used to further evaluate bony masses and suspected fractures not clearly identified on radiographic window evaluation. Instrument scatter-reduction software provides better resolution when metallic artifact is of concern.

e. MR Arthrography (MRA): This accepted investigation uses the paramagnetic properties of gadolinium to shorten T1 relaxation times and provide a more intense MRI signal. It can accurately demonstrate and rule out full-thickness tears as well as non-contrast MRI, but it is invasive and its place in the evaluation of rotator cuff pathology has not been determined. In select populations of highly active athletes, it may uncover unsuspected labral pathology such as SLAP lesions, but the arthroscopically normal labrum may produce an abnormal signal in half of MRA studies. Its contribution to the diagnosis of SLAP lesions has not been determined. An MRA is not necessary if the patient has already met indications for arthroscopy or surgery as outlined in Specific Diagnosis, Testing and Treatment. However, an MRA may be ordered when the surgeon desires further information prior to surgery.

f. Venogram/Arteriogram is a generally accepted test is useful for investigation of vascular injuries or disease, including deep-venous thrombosis. Potential complications may include pain, allergic reaction, and deep-vein thrombosis.

g. Bone Scan (Radioisotope Bone Scanning): is generally accepted, well-established and widely used. Bone scanning is more sensitive but less specific than MRI. 99MTechnecium diphosphonate uptake reflects osteoblastic activity and may be useful in metastatic/primary bone tumors, stress fractures, osteomyelitis, and inflammatory lesions, but cannot distinguish between these entities. Bone scanning is more sensitive but less specific than MRI. It is useful for the investigation of trauma, infection, stress fracture, occult fracture, Complex Regional Pain Syndrome, and suspected neoplastic conditions of the upper extremity.

h. Other Radioisotope Scanning Indium and gallium scans are generally accepted procedures usually to help diagnose lesions seen on other diagnostic imaging studies. 67Gallium citrate scans are used to localize tumor, infection, and abscesses. 111Indium-labeled leukocyte scanning is utilized for localization of infection or inflammation.

i. Arthrograms are accepted; however, rarely used except for evaluation of patients with metal implants and previous shoulder surgery.

j. If the patient has a positive ultrasound, MRI, or Arthrogram - only one of these tests are necessary to diagnose a rotator cuff tear. Any additional tests must be for additional diagnosis.

k. Diagnostic Arthroscopy (DA) allows direct visualization of the interior of a joint, enabling the diagnosis of conditions when other diagnostic tests have failed to reveal an accurate diagnosis; however, it should generally not be employed for exploration purposes only. In order to perform a diagnostic arthroscopy, the patient must have completed at least some conservative therapy without sufficient functional recovery and meet criteria for arthroscopic repair.

i. DA may also be employed in the treatment of acute joint disorders. In some cases, the mechanism of injury and physical examination findings will strongly suggest the presence of a surgical lesion. In those cases, it is appropriate to proceed directly with the interventional arthroscopy.

3. Other Tests. The following diagnostic procedures in this subsection are listed in alphabetical order.

a. Compartment Pressure Testing and Measurement Devices: such as pressure manometer, are generally accepted and useful in the evaluation of patients who present uncommon but reported symptoms consistent with a compartment syndrome.

b. Doppler Ultrasonography/Plethysmography: is useful in establishing the diagnosis of arterial and venous disease in the upper extremity and should be considered prior to the more invasive venogram or arteriogram study.

c. Electrodiagnostic Testing: Electrodiagnostic tests include but are not limited to, Electromyography (EMG), and Nerve Conduction Studies (NCS). These are generally accepted, well-established and widely used diagnostic procedures. Electrodiagnostic studies may be useful in the evaluation of patients with suspected involvement of the neuromuscular system, including radiculopathies, peripheral nerve entrapments, peripheral neuropathies, disorders of the neuromuscular junction and primary muscle disease. EMGs should not be routinely performed for shoulder injuries unless there are findings to suggest new diagnostic pathology (Refer to Brachial Plexus). In general, these diagnostic procedures are complementary to imaging procedures such as CT, MRI, and/or myelography or diagnostic injection procedures. Electrodiagnostic studies may provide useful, correlative neuropathophysiological information that would not be obtainable from standard radiologic studies. Portable Automated Electrodiagnostic Device (also known as Surface EMG) is not a substitute for conventional EMG/NCS testing in clinical decision-making, and therefore, is not recommended.

d. Personality/Psychological/Psychiatric/Psycho-social Evaluation: These are generally accepted and well-established diagnostic procedures with selective use in the upper extremity population, but have more widespread use in subacute and chronic upper extremity populations. Diagnostic testing procedures may be useful for patients with symptoms of depression, delayed recovery, chronic pain, recurrent painful conditions, disability problems, and for preoperative evaluation. Psychological/psychosocial and measures have been shown to have predictive value for postoperative response, and therefore should be strongly considered for use pre-operatively when the surgeon has concerns about the relationship between symptoms and findings, or when the surgeon is aware of indications of psychological complication or risk factors for psychological complication (e.g. childhood psychological trauma). Psychological testing should provide differentiation between pre-existing conditions versus injury caused psychological conditions, including depression and posttraumatic stress disorder. Psychological testing should incorporate measures that have been shown, empirically, to identify comorbidities or risk factors that are linked to poor outcome or delayed recovery. Formal psychological or psychosocial evaluation should be performed on patients not making expected progress within 6 to 12 weeks following injury and whose subjective symptoms do not correlate with objective signs and test results. In addition to the customary initial exam, the evaluation of the injured worker should specifically address the following areas:

i. employment history;

ii. interpersonal relationships-both social and work;

iii. patient activities;

iv. current perception of the medical system;

v. current perception/attitudes toward employer/job

vi. results of current treatment

vii. risk factors and psychological comorbidities that may influence outcome and that may require treatment

viii. childhood history, including history of childhood psychological trauma, abuse and family history of disability.

(a). Personality/ psychological/ psychosocial evaluations consist of two components, clinical interview and psychological testing. Results should help clinicians with a better understanding of the patient in a number of ways. Thus the evaluation result will determine the need for further psychosocial interventions; and in those cases, Diagnostic and Statistical Manual of Mental Disorders (DSM) diagnosis should be determined and documented. The evaluation should also include examination of both psychological comorbidities and psychological risk factors that are empirically associated with poor outcome and/or delayed recovery. An individual with a Ph.D., Psy.D, or psychiatric M.D./D.O. credentials should perform initial evaluations, which are generally completed within one to two hours. A professional fluent in the primary language of the patient is preferred. When such a provider is not available, services of a professional language interpreter should be provided.

(i). Frequency: one-time visit for the clinical interview. If psychometric testing is indicated as a part of the initial evaluation, time for such testing should not exceed an additional two hours of professional time.

4. Special Tests are generally well-accepted tests and are performed as part of a skilled assessment of the patient's capacity to return-to-work, his/her strength capacities, and physical work demand classifications and tolerances. The procedures in this subsection are listed in alphabetical order.

a. Computer Enhanced Evaluations: may include isotonic, isometric, isokinetic and/or isoinertial measurement of movement, range-of-motion (ROM), endurance or strength. Values obtained can include degrees of motion, torque forces, pressures, or resistance. Indications include determining validity of effort, effectiveness of treatment and demonstrated motivation. These evaluations should not be used alone to determine return to work restrictions. The added value of computer enhanced evaluations is unclear. Targeted work tolerance screening or gradual return to work is preferred.

i. Frequency: One time for evaluation. Can monitor improvements in strength every three to four weeks up to a total of six evaluations.

b. Functional Capacity Evaluation (FCE): is a comprehensive or modified evaluation of the various aspects of function as they relate to the worker's ability to return-to-work. Areas such as endurance, lifting (dynamic and static), postural tolerance, specific range of motion, coordination and strength, worker habits, employability, as well as psychosocial aspects of competitive employment may be evaluated. Components of this evaluation may include: musculoskeletal screen; cardiovascular profile/aerobic capacity; coordination; lift/carrying analysis; job-specific activity tolerance; maximum voluntary effort; pain assessment/psychological screening; and non-material and material handling activities. When an FCE is being used to determine return to a specific jobsite, the provider is responsible for fully understanding the job duties. A jobsite evaluation is frequently necessary. FCEs cannot be used in isolation to determine work restrictions. The authorized treating physician must interpret the FCE in light of the individual patient's presentation and medical and personal perceptions. FCEs should not be used as the sole criteria to diagnose malingering. Full FCEs are sometimes not necessary. If Partial FCEs are performed, it is recognized that all parts of the FCE that are not performed are considered normal. In many cases, a work tolerance screening will identify the ability to perform the necessary job tasks.

i. Frequency: Can be used initially to determine baseline status and for case closure when patient is unable to return to pre-injury position and further information is desired to determine permanent work restrictions. Prior authorization is required for FCEs performed during treatment.

c. Jobsite Evaluation: is a comprehensive analysis of the physical, mental, and sensory components of a specific job. These components may include, but are not limited to; postural tolerance (static and dynamic); aerobic requirements; range of motion; torque/force; lifting/carrying; cognitive demands; social interactions; visual perceptual; sensation; coordination; environmental requirements of a job; repetitiveness; and essential job functions. Job descriptions provided by the employer are helpful but should not be used as a substitute for direct observation. A jobsite evaluation may include observation and instruction of how work is done, what material changes (desk, chair) should be made, and determination of readiness to return to work. Requests for a jobsite evaluation should describe the expected goals for the evaluation. Goals may include, but are not limited to the following:

i. To determine if there are potential contributing factors to the person's condition and/or for the physician to assess causality;

ii. To make recommendations for, and to assess the potential for ergonomic changes;

iii. To provide a detailed description of the physical and cognitive job requirements;

iv. To assist the patient in their return to work by educating them on how they may be able to do their job more safely in a bio-mechanically appropriate manner; and/or

v. To give detailed work/activity restrictions.

(a). Frequency: One time with additional visits as needed for follow-up visits per jobsite.

d. Vocational Assessment: The vocational assessment should provide valuable guidance in the determination of future rehabilitation program goals. It should clarify rehabilitation goals, which optimize both patient motivation and utilization of rehabilitation resources. If prognosis for return to former occupation idetermined to be poor, except in the most extenuating circumstances, vocational assessment should be implemented within 3 to 12 months post-injury. Declaration of MMI should not be delayed solely due to lack of attainment of a vocational assessment.

i. Frequency: One time with additional visits as needed for follow-up

e. Work Tolerance Screening: is a determination of an individual's tolerance for performing a specific job based on a job activity or task and may be used when a full Functional Capacity Evaluation is not indicated. The screening is monitored by a therapist and may include a test or procedure to specifically identify and quantify work-relevant cardiovascular, physical fitness and postural tolerance. It may also address ergonomic issues affecting the patient's return-to-work potential.

i. Frequency: One time for initial screen. May monitor improvements in strength every three to four weeks up to a total of six visits.

La. Admin. Code tit. 40, § I-2321

Promulgated by the Louisiana Workforce Commission, Office of Workers Compensation Administration, LR 37:1825 (June 2011), Amended LR 49522 (3/1/2023).

AUTHORITY NOTE: Promulgated in accordance with R.S. 23:1203.1.