A physical therapy thesis is judged on more than its data. Committees in DPT and PT-related programs read for a specific register: objective, measurement-anchored, built around the language of the International Classification of Functioning, Disability and Health (ICF), and careful about which sentences carry first-person voice and which stay in the passive. Get the register wrong and a methodologically sound chapter reads as a clinical note or, worse, as vague clinical opinion dressed up as research. This guide sets out the conventions examiners actually check: tense, voice, terminology, how to name and cite standardized outcome measures, and the fixes for the mistakes that show up most often in physical therapy theses.

Why physical therapy writing has its own register

Physical therapy sits between two writing traditions. Clinical documentation trains PT students to write fast, compressed notes (SOAP format: Subjective, Objective, Assessment, Plan) using shorthand that a chart-reviewing colleague will decode instantly. Academic writing asks for the opposite: full sentences, defined terms, and enough precision that a reader outside the clinic can follow the reasoning. A thesis has to do both jobs at once — report findings with clinical precision, but in the expanded, self-contained prose a committee expects. Most register mistakes come from students carrying clinical shorthand into the thesis unchanged, or overcorrecting into a generic academic voice that strips out the field-specific terminology that actually earns the marks.

The framework your terminology should map to: the ICF

The World Health Organization’s International Classification of Functioning, Disability and Health (ICF) was endorsed by all 191 WHO Member States on 22 May 2001 (World Health Assembly resolution WHA54.21) and is now the standard vocabulary physical therapy research is expected to use. The ICF organizes findings into body functions and structures (impairment-level findings — range of motion, strength, pain), activity (what a person can do — walking distance, transfers), participation (real-world role function — return to work, sport, caregiving), and environmental factors (physical, social and attitudinal context that helps or hinders function). A results or discussion chapter that never uses this vocabulary reads as clinically fluent but academically unanchored — the first fix most drafts need is re-sorting findings explicitly into ICF domains rather than leaving them as an undifferentiated list of numbers.

Tense and voice: what changes chapter by chapter

Physical therapy examiners expect tense to track the timeline of the work, not personal preference:

• Literature review: present tense for established findings (“manual therapy reduces short-term pain”), past tense for a specific study’s result (in the pattern “Surname et al. (Year) found…”).
• Methods: past tense, describing what was actually done. First person (“I recruited participants…”) is acceptable and, per APA 7th edition style, preferred over the passive voice or “the researcher” — see when a thesis can use first person for how this varies by chapter — but check your program’s own style sheet, since some clinical programs still default to passive construction here.
• Results: past tense, strictly reporting what was observed, with no interpretive language. “Gait speed increased” belongs here; “gait speed improved” does not — “improved” is an interpretive claim that belongs in the discussion.
• Discussion: present tense when connecting to the literature (“this finding aligns with…”), past tense when referring back to your own results.

Naming standardized outcome measures the way committees expect

The American Physical Therapy Association (APTA) maintains a Tests and Measures library that lists each instrument under its full name with its standard abbreviation, which is the naming pattern a thesis should follow: the full instrument name on first use, followed by its abbreviation in parentheses, used consistently afterward. Two worked examples from APTA’s library:

• Timed Up and Go Test (TUG) — a functional mobility measure; after the first mention, “TUG” is used throughout, never re-expanded and never silently swapped for a synonym like “the mobility test.”
• Hip Outcome Score (HOS) — a patient-reported outcome measure with activities-of-daily-living and sport subscales; a thesis using it should name which subscale is reported, since “the HOS score” alone is ambiguous between the two.

The pattern generalizes: full name at first mention, standard acronym afterward, the specific subscale or version named if the instrument has more than one, and the measure’s ICF domain stated explicitly (TUG measures activity-level mobility; a manual muscle test measures strength at the body-function, or impairment, level). Committees flag theses that introduce an acronym without ever spelling it out, and theses that switch between two names for the same instrument mid-chapter. If you are building a full instrument set rather than adopting one measure, our data collection instrument templates guide covers how to document a questionnaire, interview guide or observation schedule the same way.

Numbers, units and statistics: the conventions that trip up first drafts

Physical therapy research reports quantities constantly, and a thesis has its own conventions for presenting them that differ from a clinical chart:

• Units. Use SI units throughout (centimetres, kilograms, degrees for goniometry) unless your program’s discipline convention specifies otherwise, and be consistent — do not switch between pounds and kilograms across chapters because a source study used a different system.
• Variability. Every mean needs a measure of spread reported alongside it — standard deviation (SD) most commonly, sometimes a 95% confidence interval. “Gait speed was 1.2 m/s” is incomplete; “gait speed was 1.2 m/s (SD = 0.3)” is a reportable finding.
• Statistical results. Report the test statistic, degrees of freedom where relevant, the exact p-value (not just “p < .05” unless the value is below the software’s display threshold), and an effect size. A physical therapy committee reading “the difference was significant” without a test statistic or effect size will send the chapter back.
• Capitalization of test and instrument names. Proper nouns for named instruments (Timed Up and Go Test, Berg Balance Scale, Oswestry Disability Index) are capitalized; generic descriptions of what was measured (gait speed, balance, disability) are not. Mixing the two conventions inside one sentence reads as careless.

Citing clinical practice guidelines versus primary research

A physical therapy literature review typically draws on two different kinds of source, and examiners expect each to be introduced differently. A clinical practice guideline (for example, from APTA or a specialty academy) represents a synthesized, consensus-level recommendation and should be cited as such: “current APTA guidance recommends…” rather than treating it like a single empirical study. A primary research article reporting one study’s findings should be introduced with the authors and design named, in the pattern “In a randomized controlled trial, Surname and Surname (Year) found…” Conflating the two — citing a guideline as though it were a single study, or a single small trial as though it were consensus practice — is a substance error examiners read as a register failure, because it signals the writer has not distinguished evidence tiers.

“Participant” versus “subject” versus “patient”

Word choice in the methods chapter carries more weight than students expect. Current guidance across health research (and required by most IRBs and PT program style sheets) favours “participant” over “subject” for anyone enrolled in a study — “subject” is now read as depersonalizing and dated in most contexts, though a small number of laboratory-based biomechanics programs still use it as a technical term for a person wearing motion-capture markers. “Patient” should be reserved for genuine clinical-care contexts (a case report drawn from treatment records) and avoided for someone enrolled specifically as a research participant, even if that person also happens to be receiving physical therapy care elsewhere. Getting this wrong across a whole methods chapter is one of the fastest ways to signal that a draft has not been proofread for register.

A second worked example: the literature-review sentence

Before: “Lots of studies show manual therapy helps with lower back pain.”

After: “A substantial body of evidence supports manual therapy as an effective intervention for non-specific low back pain, though effect sizes are typically small to moderate and vary by technique and patient subgroup (see, for example, the synthesis underlying current APTA clinical practice guidance).”

The revision replaces an unquantified claim (“lots of studies,” “helps with”) with a calibrated one that names the effect size range and signals awareness that the evidence is not uniform — exactly the kind of hedging precision a physical therapy committee expects from a literature review, as opposed to a clinical in-service presentation where a broader summary is acceptable.

A worked before/after rewrite

Before (clinical-note register, too compressed for a thesis): “Pt improved on TUG post-tx, 2° to ↑ QUADS strength.”

After (thesis register): “Following the eight-week intervention, participants’ mean Timed Up and Go (TUG) time decreased from 14.2 seconds (SD = 2.1) to 10.8 seconds (SD = 1.9), consistent with the observed increase in quadriceps strength measured by manual muscle testing. Because the TUG assesses activity-level mobility under the ICF framework, this result should be interpreted as a change in functional performance rather than a direct measure of the underlying impairment.”

Notice what changed: abbreviations are spelled out on first use, symbols (↑, 2°) are replaced with full words, the number carries its unit and variability (SD), and the sentence explicitly separates the observation from its interpretation — a distinction clinical shorthand collapses but a thesis cannot. The same discipline applies to numbers and grammar generally; see our guide to data is or data are for how style guides handle the count-noun edge cases that come up constantly in a results-heavy chapter, and our punctuation rules examiners notice guide for the mechanical layer underneath register.

Mistakes examiners flag most often

1. Clinical abbreviations left unexpanded — ROM, MMT, WNL and similar shorthand are fine in a chart, not in a thesis, unless defined at first use in a glossary or footnote.
2. Interpretation smuggled into the results section — words like “improved,” “successfully,” or “as expected” belong in the discussion, not results.
3. Measure names used inconsistently — switching between “TUG,” “the timed mobility test,” and “gait speed test” for the same instrument across a chapter.
4. Findings never mapped to an ICF domain — a results chapter that reports numbers without signalling whether each one is an impairment, activity, or participation-level finding.
5. Patient-first language errors — writing “the CVA patient” instead of “the participant with a history of stroke,” a phrasing shift most PT programs’ style guides now require explicitly.
6. “Subject” used where “participant” is expected — a holdover from older clinical-trial language that most current PT program style sheets and IRBs flag on first read.
7. Statistics reported without variability or effect size — a mean with no SD, or a “significant” result with no test statistic, p-value or effect size attached.

Frequently asked questions

Can I use first person in a physical therapy thesis?

Yes, in the methods and discussion, first person (“I administered the TUG at baseline and at eight weeks”) is standard under APA 7th edition guidance and preferred over the passive voice — check your own program’s style sheet, since a minority of clinical programs still require passive construction throughout.

Do I need to define every abbreviation, even common ones like ROM?

Yes. A thesis is read outside the clinic, by examiners who may not work in your specific PT sub-field. Define every abbreviation at first use, even ones that feel universal on a ward.

What is the ICF and why does my results chapter need to reference it?

The ICF (International Classification of Functioning, Disability and Health) is the WHO’s framework for sorting health findings into body functions and structures, activity and participation levels, alongside contextual factors. Committees increasingly expect a physical therapy thesis to state explicitly which ICF level each finding belongs to, rather than leaving that judgment to the reader.

Is it acceptable to name an outcome measure only by its acronym?

Only after the full name has been given once. “TUG” alone on first mention is treated as an unexplained abbreviation and is one of the most common comments examiners leave on a first draft.

How does a physical therapy results chapter differ from a sports science one?

The disciplines overlap heavily in method, but PT theses anchor findings to the ICF’s clinical framework while sports science more often reports performance metrics directly; our guide to writing the results chapter of a sports science dissertation is a useful comparison if your project sits between the two fields.

Should I write “subject” or “participant” in my methods chapter?

Use “participant” throughout unless your specific sub-field (some biomechanics or motion-capture labs) has an established technical convention for “subject.” Reserve “patient” for genuine clinical-care records, not for someone enrolled as a research participant.

Do I need to report an effect size, or is a p-value enough?

Report both. A p-value alone tells a committee whether a result is statistically distinguishable from chance; it says nothing about the size of the effect. Physical therapy examiners increasingly expect an effect size (Cohen’s d, or a comparable measure) alongside every reported statistical test.

Write the chapter in the right register from the first draft

Tesify’s thesis workspace, used by 9,000+ students and 15,000+ chapters, helps physical therapy students structure a chapter in the register their committee expects from the start: naming instruments correctly, separating observation from interpretation and mapping findings to the ICF framework. Every word stays 100% written by you.