Evaluation is treatment for low back pain

Key points

1. 01Low back pain NPRS decreased by 1.23 points and leg pain by 0.95 points through the evaluation process alone
2. 02History taking produced the largest share of improvements, with leg pain, pain catastrophizing, lumbar flexion, and pressure pain thresholds all showing significant change after the subjective interview
3. 03Pain catastrophizing (PCS) improved significantly from arrival to post-history (mean change 2.71, effect size r = 0.49) and overall (mean change 3.19, p < 0.001)
4. 04Lumbar flexion improved 4.14 cm overall (2.27 cm after history, 1.86 cm after physical exam, both p < 0.001), though changes did not reach the MCID of 4.5 cm
5. 05Longer examination time was inversely correlated with pain catastrophizing scores (r = -0.578, p < 0.001), suggesting shorter focused exams may be preferable

How it was conducted

Design

Observational cohort study, pre-post design with three measurement time points (arrival, post-history, post-physical exam)

Participants

34 adults with low back pain attending outpatient physical therapy at four clinics over 3 months (mean age 57.7 +/- 18.7 years, 53% female, mean LBP duration 113.7 months, mean ODI 28.2%)

Intervention

Standardized pragmatic history taking followed by physical examination, each conducted by an attending PT; outcome measures taken by a separate blinded PT

Primary outcome

Numeric Pain Rating Scale (NPRS) for low back and leg pain

Secondary outcomes

Fear-avoidance beliefs (FABQ), pain catastrophizing (PCS), lumbar flexion (fingertip-to-floor), and pressure pain thresholds (PPT) at hand, upper trapezius, and low back

Analysis

Friedman ANOVA with Bonferroni correction for non-parametric outcomes; repeated-measures ANOVA for flexion and PPT; effect sizes calculated as r = Z/sqrt(N1+N2)

What they found

• NPRS low back: significant overall reduction of 1.23 points (arrival to post-physical exam, p = 0.009, effect size r = 0.36); reduction of 0.95 after history alone (p = 0.345, not significant between history and physical exam)
• NPRS leg pain: significant change after history taking (mean change 1.04, p = 0.033, effect size r = 0.31); overall change 0.95 (p = 0.054)
• PCS: significant improvement from arrival to post-history (mean change 2.71, p = 0.003, effect size r = 0.40); overall change 3.19 (p < 0.001, effect size r = 0.49); number of patients scoring >30 dropped from 12 to 6 after history
• Lumbar flexion: improved 2.27 cm after history (p < 0.001), an additional 1.86 cm after physical exam (p < 0.001), total 4.14 cm (p < 0.001); no changes met or exceeded the MCID of 4.5 cm
• PPT at hand, upper trapezius, and low back all exceeded the 15% MCID threshold from arrival through post-physical exam
• FABQ-PA improved at each time point but did not reach significance after Bonferroni correction (overall mean change 2.68, p = 0.054)
• 23.5% of patients (n = 8) had a clinically meaningful reduction in LBP (>/= 2 NPRS points) after history; 26.5% (n = 9) for leg pain
• Duration of physical exam positively correlated with PPT at low back (r = 0.366, p = 0.033) and hand (r = 0.345, p = 0.046), and negatively correlated with PCS (r = -0.578, p < 0.001)
• Therapist-reported connection with patient (mean 7.15/10) did not significantly correlate with patient outcome changes

Limitations

• Observational cohort design without a control group prevents establishing direct causal relationships
• Small sample size (n = 34) resulted in a study underpowered for some comparisons; post hoc power analysis confirmed this, increasing risk of Type II error
• History taking always preceded the physical exam, so order effects cannot be ruled out; reversing the sequence might produce different results
• Changes were only measured immediately after evaluation with no follow-up, so durability of improvements is unknown; Hawthorne effect cannot be excluded

Why it matters

For patients

Being thoroughly interviewed and examined by a physical therapist may itself reduce your pain and improve your ability to move before any hands-on treatment starts.

For clinicians

The evaluation ritual, especially skilled history taking, has measurable therapeutic effects on pain, catastrophizing, and mobility in LBP patients, suggesting that the quality and structure of the intake process matters independently of chosen treatment.

For readers

This study challenges the assumption that only formal treatment drives early improvement in LBP, pointing to the therapeutic value of the clinical interview and examination process itself.