Four things a muscle injury can be
MSK.01 spans strains, contusions, surgical repairs and heterotopic ossification. The exam wants you to distinguish them, because the mechanism decides the management.
Strain
A tension injury. The muscle is overstretched or overloaded, often during a fast eccentric contraction, tearing fibres at or near the musculotendinous junction. Sudden, with a painful moment the client can usually name.
Contusion
A compression injury. A direct blow crushes muscle against bone, bleeding into the tissue. Common in contact sport, classically the quadriceps. The hidden risk here is heterotopic bone.
Repair or reconstruction
A complete rupture or severe injury managed operatively. Your job is protected, criteria-based loading within the surgeon's protocol, not chasing range or strength ahead of tissue healing.
Heterotopic ossification
Myositis ossificans. Bone forms inside the muscle after trauma, weeks later. It is on the Blueprint for a reason, and aggressive early treatment is what causes it. More below.
Click a grade. Predict the findings.
Grading a strain drives everything downstream: your prognosis, your loading, and whether this needs a surgeon. Explore each, and add contusion and soreness so you can tell them apart.
Schematic, not anatomical. Tap or use Tab plus Enter.
Two kinds of contusion, two prognoses
Where the blood goes changes how fast the client recovers and how much you worry. Flip each card.
Loading follows the phase of healing
Muscle heals in overlapping phases. Naming the phase you are treating in, and matching load to it, is the reasoning mark.
The first days: PEACE, then LOVE
PEACE and LOVE reflects current soft tissue guidance: active loading and education over prolonged rest and passive modalities. Confirm any modality choice against current best evidence and the client's presentation.
Loading that scores
- Progressive and criteria-based. Advance when the current load is pain free and controlled, not when a set number of days has passed.
- Isometrics early for pain modulation and to load tissue safely, progressing to isotonic through range.
- Eccentric strength as it settles, because eccentric overload is how many strains happen and how you build resilience to them.
- Restore length and control before speed, then add speed and sport-specific demand.
- Address the cause, whether that is strength, flexibility, fatigue, training load or technique.
Return to sport is a decision, not a date
- Full pain free range of motion
- Strength near symmetry with the other side, commonly cited around ninety percent
- Passing functional and hop testing
- Sport-specific speed, change of direction and confidence
What you gather, in order
Lead with the history and screening that rules out the dangerous stuff, then work through impairment to function.
Subjective and screening
- Mechanism: sudden tension versus a direct blow
- Exact moment of onset, a pop or tearing sensation
- Ability to continue, weight bear, or use the limb
- Swelling and bruising timeline
- Prior injury to the same muscle, training load, fatigue
- Red flag screen: calf signs, disproportionate pain, systemic features
Body structure and function
- Observation: swelling, bruising, deformity, a visible defect
- Palpation for tenderness, a gap, or a firm mass
- Active and passive range of motion
- Pain and strength on resisted contraction
- Pain on passive stretch of the muscle
- Girth for swelling, neurovascular check distally
Activity and participation
- Gait and weight bearing tolerance
- Sit to stand, stairs, squat and lunge as relevant
- Running, hopping and change of direction when safe
- Work, sport and role demands
- What the client needs to get back to, and by when
| Feature | Strain | Contusion | DOMS | Compartment syndrome | DVT |
|---|---|---|---|---|---|
| Onset | Sudden, during effort | Direct blow | 24 to 72h after exercise | Builds after injury or exertion | Gradual, often no clear cause |
| Pain on passive stretch | Yes, focal | Yes | Mild, diffuse | Severe, out of proportion | Variable |
| Key sign | Focal tenderness, strength loss | Bruising, firm swelling | Diffuse soreness, no defect | Tense compartment, paraesthesia | Unilateral calf swelling, warmth |
| Your move | Grade and load | Protect, avoid aggressive work | Reassure, active recovery | Urgent surgical referral | Urgent medical referral |
Imaging such as ultrasound or MRI can confirm the grade and location when it will change management, for example distinguishing a partial from a complete tear.
Outcome measures worth naming
Name the measure, then name the score that would change your plan. That is the reasoning mark on top of the recall mark.
| Measure | What it captures | Use it for |
|---|---|---|
| Numeric Pain Rating Scale | Pain intensity, at rest and on loading | Tracking irritability and guiding load progression |
| Patient-Specific Functional Scale | Client-chosen activities they cannot do | Anchoring goals to what matters to this person |
| Lower Extremity Functional Scale | Lower limb function across daily tasks | Lower limb strains, tracking overall function |
| Range of motion | Active and passive joint range | Objective early marker; compare to the other side |
| Strength testing | Manual muscle testing or hand-held dynamometry | Return-to-sport symmetry targets, commonly near ninety percent |
| Girth measurement | Limb circumference | Objectifying swelling in a contusion or acute strain |
| Single-leg hop tests | Functional power and symmetry | Late-stage return-to-run and return-to-sport decisions |
Confirm current cut-off and symmetry values against the source and current best practice before relying on them clinically.
The section that fails candidates
Every oral case has a safety domain. In a muscle case it is nearly always a missed red flag or overloading tissue that is not ready.
Red flags
- Acute compartment syndrome: pain out of proportion, pain on passive stretch, a tense compartment, paraesthesia. A surgical emergency.
- Deep vein thrombosis: unilateral calf swelling, warmth, tenderness. Urgent medical referral, do not massage.
- Complete rupture: a palpable gap, marked weakness, a bunched muscle. Needs a surgical opinion.
- Fracture: bony tenderness, inability to weight bear, deformity.
- Rhabdomyolysis: very dark urine, severe pain and systemic illness after major muscle damage. Medical emergency.
Your pre-treatment checks
- Confirm the mechanism and severity, and whether a complete tear or fracture has been excluded.
- Screen for compartment syndrome and DVT before any hands-on or loading.
- Check the injury is in a phase that tolerates the load you are planning.
- For post-surgical clients, work strictly within the surgeon's protocol and precautions.
- Set load by the client's pain and control response, not by a fixed programme.
Complications you are expected to prevent
Each is a plausible curveball, and each has a physiotherapy answer and a referral answer.
Myositis ossificans
Heterotopic bone within a muscle after trauma, classically the quadriceps. It presents weeks after the injury with a firm mass, aching, and stubbornly limited range.
- Prevent it: no aggressive stretching, deep massage or heat on a fresh contusion.
- Manage it: pain free active movement, avoid provoking it, and refer for imaging if a firm mass and stiffness persist.
- Do not chase range forcefully. Surgical excision, if ever needed, waits until the bone is mature.
The rest of the list
- Re-injury. The commonest complication, usually from returning before strength, capacity and control are restored. Criteria-based progression is the guard against it.
- Chronic pain and deconditioning. From prolonged rest and fear of loading. Active rehabilitation and education counter both.
- Compartment syndrome. Acute is an emergency; chronic exertional is activity-related and settles with rest, and is diagnosed medically.
- Scarring and reduced extensibility. Managed with graded loading through range rather than forceful stretching.
- Persistent weakness. Especially after a high-grade or surgical injury; needs a full strength and capacity programme, not just range.
Who you refer to, and exactly why
Name the professional and name the reason. That is the whole mark.
Physician or sports physician
Suspected DVT, compartment syndrome, fracture or rhabdomyolysis, imaging requests, and medical management of pain.
Orthopaedic surgeon
Suspected complete rupture with a palpable gap, and post-operative protocol and precautions after repair or reconstruction.
Diagnostic imaging
Ultrasound or MRI to confirm grade and location, or to distinguish a partial from a complete tear when it changes the plan.
Athletic therapy and strength staff
Sport-specific return-to-play progression and load management, coordinated so the plan is consistent across the team.
Coach and employer
With the client's consent, modified training or duties and a realistic return timeline, so external pressure does not rush the tissue.
Support personnel
You may assign a stable, well-defined exercise with supervision. You may not delegate assessment, grading, or the decision to progress load.
The conversation that protects the tissue
Most re-injuries are a communication failure as much as a loading one. If you remember one thing, make it that loading is treatment, and say it in your case.
Do
- Explain that early, graded loading helps healing and is not damaging tissue.
- Give a realistic timeframe for the grade, without over-promising.
- Teach the client to read their own pain as a guide to progression.
- Be explicit about why return to sport is criteria-based, not calendar-based.
- Confirm understanding and consent before hands-on treatment or loading.
Do not
- Prescribe prolonged complete rest by default. It deconditions and delays return.
- Let a client, coach or parent pressure you into an early return. State the criteria and hold them.
- Imply pain always means damage, which fuels fear and avoidance.
- Promise a fixed return date you cannot control.
Consent, scope, and the awkward questions
Consent and scope
- Consent is informed and ongoing, and can be withdrawn mid-session.
- If a red flag suggests something outside physiotherapy scope, say so and refer, rather than pressing on.
- Work within your competence; seek supervision or consult for a presentation you are unsure about.
- For minors or athletes, clarify who is involved in decisions and document consent appropriately.
Situations that show up in cases
- Return-to-play pressure. The coach wants the athlete back for a final. Acknowledge it, explain the criteria and the re-injury risk, offer what is safe, and document the conversation.
- Client wants passive treatment only. Explore why, educate on active loading, and negotiate a plan they will follow.
- Refusing your advice. Provide the information, respect the decision, document it, and inform the team where relevant.
- Documentation. Record the grade, objective findings, the load prescribed and the reasoning for progression.
Answer out loud, then reveal
Speak your answer for sixty seconds before opening the card. Reading a model answer feels productive and teaches almost nothing.
A footballer felt a sudden sharp pain in the back of the thigh while sprinting and had to stop. Describe your assessment and how you would grade it.
History: a sudden tension injury while sprinting points to a hamstring strain at the musculotendinous junction. I would ask about a pop or tearing sensation, ability to continue, and any prior hamstring injury.
Examination: observe for swelling and bruising, palpate for focal tenderness and any gap, test active and passive knee and hip range, resisted knee flexion for pain and strength loss, and pain on passive hamstring stretch. Screen distal neurovascular status.
Grading: minimal strength loss with pain on stretch suggests grade one; clear weakness, swelling and painful movement suggests grade two; a palpable gap with marked weakness and a bunched muscle suggests grade three, which I would refer for a surgical opinion. Imaging can confirm the grade if it changes management.
A rugby player took a knee to the thigh three days ago. It is now very tight and painful with limited knee flexion. What is your management and what must you avoid?
Reasoning: this is a quadriceps contusion, and the tightness with limited flexion suggests an intramuscular bleed, which carries a higher myositis ossificans risk.
Manage: protect and offload initially, gentle pain free active range of motion, and gradual loading as symptoms allow, guided by pain and control.
Avoid: vigorous massage, forced or aggressive stretching, and heat over the fresh contusion, because these can worsen bleeding and increase the risk of heterotopic bone. I would also screen for rising compartment pressure and escalate if pain became disproportionate.
Your client's pain is far worse than expected, the compartment feels tense, and passive stretch is agony. What do you do?
Immediate: stop treatment. I am concerned about acute compartment syndrome, which is a surgical emergency.
Do not: elevate the limb high or apply compression, because both can further reduce perfusion. Do not continue loading or massage.
Escalate: arrange urgent medical or surgical review without delay, keep the limb at heart level, monitor neurovascular status, and document the findings and the time course clearly.
Six weeks after a grade two calf strain the client wants to return to running. How do you decide?
Criteria, not calendar. I would confirm full pain free range, calf strength near symmetry with the other side, and the ability to load the calf repeatedly, for example single-leg heel raises to a comparable number and single-leg hop testing without pain or apprehension.
Graded return: begin with a structured walk-run progression rather than full running, monitor for next-day soreness, and advance on tolerance. I would also address why it happened, such as strength, capacity or training load, to reduce re-injury risk.
A colleague suggests complete rest until the client is pain free. How do you respond?
Respectfully and with evidence. Current soft tissue management favours early, graded loading over prolonged rest, captured in frameworks like PEACE and LOVE. Prolonged rest deconditions the tissue and delays return, whereas appropriate loading supports healing.
I would propose protected early movement within pain limits, progressing load on the client's response, and monitor objectively so our decisions rest on measurement rather than fear of movement.
Can you do all fourteen?
Tick honestly. Anything unticked is your next study block.
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