Patient expectations, outcomes and satisfaction: related, relevant or redundant?

STUDY
DESIGN: A prospective case series of patients undergoing lumbar spine surgery.
OBJECTIVE: Is there a correlation between patients' expectations before lumbar surgery, postoperative outcomes, and satisfaction levels?
METHODS: A prospective study of 145 patients undergoing primary, single-level surgery for degenerative lumbar conditions was conducted. Oswestry Disability Index, back Visual Analog Scale (VAS), and leg VAS were assessed preoperatively and at 6 weeks and 6 months after surgery. Patients' expectations were measured preoperatively by asking them to score the level of pain and disability that would be least acceptable for them to undergo surgery and be satisfied. Satisfaction was assessed 6 weeks postoperatively with a Likert scale. Differences in patient expectations between actual and expected improvements were quantified.
RESULTS: Most patients had a clinically relevant improvement, but only about half achieved their expectations. Satisfaction did not correlate with preoperative pain or disability, or with patient expectation of improvement. Instead, satisfaction correlated with positive outcomes.
CONCLUSIONS: Patient expectations have little bearing on final outcome and satisfaction. [Table: see text].

Study Rationale and Context

The relationship between patient expectations and satisfaction, and their influence on outcome, is complex, and opinion varies. Some suggest higher expectations predict greater satisfaction1,2,3 and better outcome,4,5 or that greater satisfaction is associated with better outcome.6 Others have found some patients were dissatisfied even if expectations were met,7 or that functional outcome is a weak correlate of satisfaction.8

Clinical Question

What do patients expect from their surgical treatment, and are they satisfied with their postoperative results? What are the relationships between expectations, outcome, and satisfaction?

Methods

Prospective case series study.

Primary, single-level surgery for degenerative lumbar spine conditions from June 2007 to February 2009 by a single surgeon (PL); complete data.

(Fig. 1)

Fig. 1

Patient sampling and selection.

Multiple level or revision surgery or incomplete data

Surgical complications requiring revision or prolonged hospital admission

Patients with active or pending litigation

(Fig. 1)

Patients undergoing primary, single-level surgery by a single surgeon for degenerative lumbar conditions were included.

The diagnoses included disc prolapse; isthmic and degenerative spondylolisthesis; central, lateral recess, and foraminal spinal stenosis; and discogenic low back pain. Duration of symptoms ranged from 6 weeks (disc prolapse) to 6 months (stenosis, spondylolisthesis, and back pain).

Routine preoperative counseling by surgeon and clinical staff was conducted on at least two occasions for each patient. This included risks, benefits, potential complications, and goals of surgery. Mutual patient and surgeon expectations were documented preoperatively.

Oswestry Disability Index (ODI), back Visual Analog Scale (VAS), and leg VAS scores were collected preoperatively, and at 6 weeks and 6 months postoperatively.

Patients' expectations were measured preoperatively by asking them to score the level of pain (back and leg VAS) and disability (ODI) that would be least acceptable for them to undergo surgery and be satisfied with the outcome.

Satisfaction was assessed 6 weeks postoperatively with a 5-point Likert-type scale.

The data were collected by a research assistant. This was at the conclusion of the normal preoperative counseling to standardize this process and to minimize potential bias in patient scores, in particular the satisfaction levels.

Actual improvements in back and leg VAS and ODI were calculated by subtracting the postoperative score from the preoperative score.

The accepted minimal clinically important difference (MCID) of 12.8 in ODI, 1.2 in back VAS, and 1.6 in leg VAS9 was compared with the actual improvement to determine whether these improvements were clinically relevant.

To determine whether the expected improvement had been met, the difference between actual (6-month postoperative) improvement and expected improvement was calculated (ΔAB). A negative value meant that the expectation had not been met and a value of zero or greater meant that the expectation had been met or exceeded.

However, to determine whether this difference was clinically relevant, the accepted MCID was applied to the value, and this was termed the clinically relevant benefit difference (ΔRB). The reason for the application of this margin was to recognize that a small negative value of ΔAB may be of no clinical relevance.

Hundred and forty-five patients were studied. Patient characteristics and surgical procedures are outlined in Table 1.

Table 1

Patient characteristics and surgical procedures.*

	N = 145
Patient characteristics, No. (%)
Age, y (mean ± SD)	54 ± 15
Male	91 (63)
Privately insured	117 (81)
Workers compensation	22 (15)
Uninsured	6 (4)
Surgical procedures, No. (%)
Discectomy	58 (40)
Laminectomy	20 (14)
Laminectomy and posterolateral fusion	27 (19)
TLIF	27 (19)
ALIF	13 (9)

TLIF indicates transforaminal lumbar interbody fusion; ALIF, anterior lumbar interbody fusion.

Most patients improved with surgery. Absolute and clinically important changes in ODI, back VAS and leg VAS at 6 weeks and 6 months are shown in Table 2.

Table 2

Change in ODI and VAS at 6 weeks and 6 months after surgery.*

	Improved from baseline, No. (%)		Achieved clinical benefit, No. (%)		No improvement from baseline, No. (%)		Worse compared with baseline, No. (%)
	6 wk	6 mo	6 wk	6 mo	6 wk	6 mo	6 wk	6 mo
ODI	138 (95)	138 (95)	95 (66)	111 (77)	2 (1)	4 (3)	5 (3)	3 (2)
Back VAS	130 (90)	133 (92)	105 (72)	110 (76)	7 (5)	6 (4)	8 (6)	6 (4)
Leg VAS	131 (90)	130 (90)	119 (82)	124 (86)	8 (6)	9 (6)	6 (4)	6 (4)

ODI indicates Oswestry Disability Index; VAS, Visual Analog Scale.

The average preoperative scores decreased at 6 weeks and 6 months, but not to the average expected levels (Table 3).

Table 3

Average outcome and expectation scores of patients.*

	Preop	6 wk	6 mo	Expectation
ODI	51%	22%	17%	14%
Back VAS	5.8	2.1	1.7	1.5
Leg VAS	6.2	1.4	1.2	1.1

Preop indicates preoperative; ODI, Oswestry Disability Index; and VAS, Visual Analog Scale.

Expectations were met or exceeded in more than half of cases. Most were very satisfied with the outcome. Ninety percent of patients expected an ODI ≤ 20, 95% expected leg VAS ≤ 2, and 80% expected back VAS ≤ 2. Interestingly, some patients expected to do poorly (Fig. 2).

Fig. 2

Patients' expected outcome scores recorded preoperatively. Numbers of patients in bands of expected values are shown to indicate the nature of the expectations. ODI indicates Oswestry Disability Index; VAS, Visual Analog Scale.

The numbers of patients who met or exceeded their expectations are shown in Table 4. The percentages increased from 6 weeks to 6 months and the percentages were higher when the MCID margin was applied to account for those patients with small gaps between expectations and outcomes (Fig. 3). Most patients (109/145) were “very satisfied” and another 26 patients reported being “satisfied” with their outcome. The least satisfied were the ten “somewhat satisfied” patients. The “somewhat satisfied” patients had higher scores of disability and back pain postoperatively compared with the whole cohort. Additionally, they expected more pain after surgery (Table 5).

Table 4

Percentage of patients who achieved actual (ΔAB) and clinically relevant expectations (ΔRB).*

	6 wk, %		6 mo, %
	ΔAB	ΔRB	ΔAB	ΔRB
ODI	37	66	50	77
Back VAS	51	72	59	76
Leg VAS	62	82	63	86

ODI indicates Oswestry Disability Index; VAS, Visual Analog Scale.

Fig. 3

Patients meeting or exceeding expectations (Oswestry Disability Index [ODI] and Visual Analog Scale [VAS] scores) at 6 months.

Table 5

Outcome and expectations of “somewhat satisfied” patients compared with “very satisfied” and “satisfied” patients (P < .05 shaded).*

	Preoperative	6 wk	6 mo	Expectation
ODI scores
Somewhat (n = 10)	63%	50%	38%	17%
Very satisfied and satisfied (n = 135)	50%	20%	16%	14%
Back VAS scores
Somewhat (n = 10)	6.5	5.9	4.3	2.6
Very satisfied and satisfied (n = 135)	5.8	1.8	1.5	1.4
Leg VAS scores
Somewhat (n = 10)	6.1	2.9	3	2
Very satisfied and satisfied (n = 135)	6.2	1.3	1.1	1.1

ODI indicates Oswestry Disability Index; VAS, Visual Analog Scale.

Analysis of the correlation between expectation and satisfaction was difficult. We examined the “very satisfied” patients, as numbers for the “satisfied” and “somewhat satisfied” groups were too small for analysis. We found no correlation as to whether they had a high or low expected change in their scores (Table 6).

Table 6

Comparison of “very satisfied” patient expectations (preoperative ODI or VAS score – expected ODI or VAS score) and satisfaction rates (> .05 for all groups).*

Preoperative to expected change	Expected change
	Very highODI (>60)	Very lowODI (<10)	Very highback VAS (>8)	Very lowback VAS (<2)	Very highleg VAS (>8)	Very lowleg VAS (<2)
Very satisfied	15/21 (71%)	11/16 (69%)	3/4 (75%)	20/24 (83%)	13/14 (93%)	14/21 (67%)

ODI indicates Oswestry Disability Index; VAS, Visual Analog Scale.

Further detailed investigation of those who either achieved their expectations by a high level or by a low level (expected to final), similarly, found no correlation. There was no statistically significant relationship observed between the expected ODI and VAS changes in the “very satisfied” patients with high and low preoperative expectations and their satisfaction rates (Table 7).

Table 7

“Very satisfied” patients and the degree expectation exceeded or not reached (total number of patients, and percentages).*

	Difference between 6-mo postoperative ODI or VAS and expected ODI or VAS
	ODIΔ ≥ 15	ODIΔ ≤ −30	Back VASΔ ≥ 2	Back VASΔ ≤ −2	Leg VASΔ ≥ 2	Leg VASΔ ≤ −2
“Very satisfied”	12/18 (67%)	9/15 (60%)	5/9 (56%)	10/19 (53%)	5/10 (50%)	11/18 (61%)

ODI indicates Oswestry Disability Index; VAS, Visual Analog Scale.

Discussion

Patients had high expectations and most were satisfied regardless of whether they exceeded or did not meet their expectations. Approximately half of the patients reached their expectations. Despite this, most were satisfied with their outcome.

Those less (somewhat) satisfied patients expected more pain and indeed had more pain postoperatively.

No other correlation between satisfaction, expectation, and outcome was identified.

Measurement of satisfaction with a single 5-point scale is simplistic, and patients may score to please. Assessment from outside the practice environment may give a more independent score.

Patients may have experienced difficulty with quantifying their expectations with this methodology.

A more homogeneous group of patients may have yielded different results.

Further statistical analysis of a larger cohort would be required to determine any relationship between patients' preoperative expectations and their satisfaction with the surgical outcome.

Meeting patient expectations and achieving patient satisfaction are important outcomes in any surgical environment. However, these subjective variables are difficult to evaluate and interpret objectively.

Furthermore, their relevance to clinical practice and how to change practice to optimize them is incompletely understood.8

A statistically significant relationship between patients' preoperative expectations and satisfaction with surgical outcome was not observed within this study.

Measurement of expectations may identify those with unrealistic expectations and allow them to be counseled preoperatively, but in this study there was no clear influence of outcome on satisfaction.

Summary and Conclusions

This was a study of the relationship between patient preoperative expectations and satisfaction with surgical outcome for single-level primary lumbar surgery conducted by a single surgeon. The results showed that:

Patients had high expectations, and these were reached in approximately half of the cohort. Most patients were satisfied, and those less (somewhat) satisfied had poorer outcomes overall.

There was no other correlation found in this study between satisfaction, expectations, and outcome.

Final class of evidence-treatment
Study design
RCT
Cohort
Case control
Case series	•
Methods
Concealed allocation (RCT)
Intention to treat (RCT)
Blinded/independent evaluation of primary outcome
F/U ≥ 85%	•
Adequate sample size	•
Control for confounding
Overall class of evidence	IV
The definiton of the different classes of evidence is available on page 67.