What weeks 6–12 rehab is actually working toward

By weeks six to twelve after total hip arthroplasty, the acute phase is behind you — surgical wounds have closed, basic mobility has returned, and the immediate demands of safe weight-bearing and pain control have largely been met. What the body is working through now is a different challenge: rebuilding the hip abductors and glutes that were weakened by surgery and pre-operative muscle loss, re-establishing single-leg balance and control, and normalising a gait pattern that has often shifted to compensate for months of pain.

For patients who had a posterior-approach replacement, this window still sits within the standard 90-day precaution period — hip flexion beyond 90° and internal rotation remain restricted while the posterior capsule and repaired tendons continue to consolidate. Exercise selection in this phase must respect those boundaries. Patients who underwent a SPAIRE procedure, which preserves the short external rotators, typically have fewer restrictions on movement direction, though progression is still guided by individual clinical criteria.

The functional targets for weeks six to twelve are specific: hip abductor and extensor strength approaching grade 4+/5, a smooth heel-to-toe gait without a limp, the ability to manage stairs with confidence, and steadily increasing walking distance. Getting there depends not on how many weeks have passed, but on meeting those benchmarks — which is why the dosage and progression guidance in the sections below is built around clinical criteria rather than calendar dates.

How often to exercise each week

Frequency depends on what the exercise is asking of the tissue. Progressive strengthening sessions — bridges, step-ups, standing hip extension, mini-squats — are typically prescribed 3–4 times per week, with at least one rest day between each to allow muscle and connective tissue to adapt. Running this type of loading daily tends to accumulate fatigue rather than drive further gains.

Range-of-motion and flexibility work follows a different rule: it can be performed every day, often as a short morning or evening routine, without the same recovery requirement. Keeping these two categories clearly separate helps patients build a sustainable weekly structure rather than an exhausting one.

Meaningful functional improvement does not require the maximum frequency. One RCT found that a 6-week block of just two weight-bearing sessions per week — 12 sessions in total — produced substantially greater improvement in hip disability scores than a non-weight-bearing protocol run at the same frequency. For patients managing fatigue, competing commitments, or significant travel from outlying areas of Lincolnshire, this suggests that consistency and exercise quality at a moderate frequency matter more than simply adding sessions.

A separate prescription applies to cardiovascular work: stationary cycling is typically introduced twice daily at this stage, beginning at 10–15 minutes per session, because it provides gentle joint loading and hip ROM stimulus without the demands of a full strengthening session.

Closer to the week-12 mark, a more intensive supervised block — commonly three clinic visits per week for four weeks, totalling 12 sessions — is used to transition into heavier progressive loading, a structure demonstrated to be feasible and effective in a pilot RCT by Madara et al. (2019).

Sets, reps, and load: what the evidence recommends

The numbers most clinicians and protocols converge on for progressive resistance work in weeks 6–12 are 2–3 sets of 10–15 repetitions per exercise, with pain kept below 4/10 throughout. This range accommodates a broad spread of patients — from those still building basic tolerance to those ready for heavier loading — and forms a practical starting point for most mid-phase programmes.

A phased resistance model reviewed by Bull (2024, PMC10909313) takes a slightly different approach: 3–5 sets × 10 reps during weeks 1–6, shifting to 3–5 sets × 8 reps in weeks 6–12. The reduction in repetitions is deliberate — it reflects a move toward heavier loads as the priority transitions from general conditioning to strength development. Across the studies reviewed, resistance training post-THA was associated with a 30% improvement in functional performance.

Where muscular endurance is the primary goal — for example, in patients with physically demanding daily-life routines — some protocols extend the rep range to 15–20 reps at 2–3 sets, run 3–5 sessions per week. The AAOS exercise guide frames the dosage differently again: 10 repetitions performed four times throughout the day for individual hip-strengthening exercises, or a continuous 20–30 minute session. The structure differs from the block model, but the total volume is broadly compatible.

What unifies these variants — progressive load, adequate frequency, and pain-monitored effort — is more clinically significant than what separates them. The PHETHAS-1 cohort study (2023, n=94) found no significant dose-response relationship between elastic band exercise volume — a median of 339 repetitions per week across weeks 3–10 post-THA — and improvement in gait speed. That finding redirects attention from precise rep-count targets toward exercise quality, appropriate load selection, and physiotherapist input to ensure progression is genuine rather than just accumulated.

The exercise menu for weeks 6–12

Structured around the functional priorities of abductor and glute strength, single-leg control, and progressive loading, the mid-phase exercise menu follows a consistent pattern across clinical protocols. Each exercise below carries an indicative starting dose and a clear criterion for moving forward.

• Bridges — 3 sets × 10 reps. Progress to the single-leg variant, or add a resistance loop around the thighs, once the double-leg version is pain-free and no longer demanding through a full set.
• Side-lying hip abduction — 3 sets × 10 reps. Introduce a resistance band when the bodyweight version is performed consistently without compensatory trunk shift or pelvis drop.
• Standing hip extension — 3 sets × 10 reps, with a 2–3 second isometric hold at end range. Progress to a heavier resistance band once the hold is sustained cleanly across the full set.
• Step-ups — 3 sets × 10 reps on a low step. Increase step height progressively as single-leg control and Trendelenburg stability improve.
• Mini-squats — 2–3 sets × 10 reps. Knee bend is kept to ≤90°, which aligns with the standard posterior-approach precaution still in force for many patients during this window. SPAIRE patients, whose short external rotators and posterior capsule are preserved rather than sectioned, may face fewer movement restrictions — but the operative surgeon's guidance determines when any precaution is formally lifted.

These exercises are representative of a clinically standard mid-phase menu, not a personal programme. Surgical approach, pre-operative fitness, and individual capacity all influence how dosage and sequencing play out in practice.

When to progress: the clinical gate criteria

Readiness to progress is determined by what the body can do, not by which week appears on the calendar. Three objective benchmarks guide most clinicians.

Strength is the primary gate. Hip abductor and extensor muscles should reach grade 4+/5 on manual muscle testing — meaning they can move the limb against meaningful resistance, not merely gravity — before single-leg progressions or increased loading are introduced.

Gait quality is the second benchmark. A normal heel-to-toe walking pattern without a visible limp is required before advancing. Closely tied to this is the Trendelenburg sign: when standing on the operated leg, the pelvis should remain level. If the opposite hip drops, the hip abductors on the standing side are not yet carrying load effectively, and single-leg work is premature regardless of how a session feels subjectively.

Assistive device weaning follows gait quality, not a fixed date. The sequence — walking frame to crutches, crutches to a single cane, single cane to unaided walking — should move forward only when each stage produces a symmetrical, controlled gait pattern.

Within sessions, two rules apply universally. Sharp or localised joint pain is a signal to stop; a pain score consistently above 4/10 during an exercise indicates the load is too high. Mild muscle ache in the hours after exercise — delayed-onset muscle soreness — is expected and does not indicate harm.

A physiotherapy review at this stage provides the appropriate clinical checkpoint to assess all three gate criteria and confirm whether the programme is ready to advance.

How surgical approach changes mid-phase dosing

Across the three main surgical routes encountered in practice — posterior, SPAIRE, and anterior — the set-and-rep dosage framework described in earlier sections applies broadly to all. The variable that changes is permissible range of motion, not volume prescription.

Posterior-approach patients remain within the standard ~90-day restriction window throughout weeks 6–12, so the flexion and internal-rotation limits introduced earlier continue to shape exercise selection: step height, squat depth, and cycling seat position all require adjustment to stay within those bounds until the surgeon formally withdraws them.

SPAIRE (Saves Piriformis And Internus with Repair of Externus) preserves the short external rotators and posterior capsule intact rather than sectioning them, which removes the mechanical basis for those restrictions. In practice, SPAIRE patients may access deeper squat ranges, higher step-up heights, and single-leg balance progressions earlier in the 6–12 week window — within the same 2–3 sets × 10–15 rep framework. The approach was developed by Professor Paul Y. F. Lee on precisely this rationale: maintaining tendon continuity removes the precaution, not the passage of time.

Anterior-approach patients typically avoid posterior precautions, but this route carries its own early cautions: hip hyperextension and prone lying are commonly restricted in the first post-operative weeks to protect the anterior capsule repair, and some surgeons extend these restrictions into the mid-phase window.

No published evidence has established separate dosage targets by approach. The PHETHAS-1 cohort (n=94) found no dose-response relationship between elastic-band exercise volume and gait-speed improvement across weeks 3–10, suggesting that movement quality and permissible range contribute more to outcomes than raw repetition count. The operating surgeon's post-operative protocol remains the authoritative source on when any approach-specific restriction is formally lifted.

1. [1] Progressive Rehabilitation After Total Hip Arthroplasty: A Pilot and Feasibility Study – PMC (Madara 2019). (2019). https://pmc.ncbi.nlm.nih.gov/articles/PMC6670053/ https://pmc.ncbi.nlm.nih.gov/articles/PMC6670053/
2. [2] Progressive Rehabilitation After Total Hip Arthroplasty – PMC (Madara 2019). (2019). https://pmc.ncbi.nlm.nih.gov/articles/PMC6670053/ https://pmc.ncbi.nlm.nih.gov/articles/PMC6670053/
3. [3] Hypertrophy Training Following A Total Hip Replacement: A Literature Review – PMC (Bull 2024). (2024). https://pmc.ncbi.nlm.nih.gov/articles/PMC10909313/ https://pmc.ncbi.nlm.nih.gov/articles/PMC10909313/
4. [4] Hip strengthening exercise dosage is not associated with clinical improvements after THA – PHETHAS-1 (BMC Musculoskeletal Disorders 2023). (2023). https://link.springer.com/article/10.1186/s12891-024-08057-x https://link.springer.com/article/10.1186/s12891-024-08057-x
5. [5] Hip strengthening exercise dosage is not associated with clinical improvements after total hip arthroplasty – PHETHAS-1 study. (2023). https://doi.org/10.1186/s12891-024-08057-x https://doi.org/10.1186/s12891-024-08057-x